Diclofenac Sodium Tablet, Delayed Release
FDA Label NDC 68788-4194

Delayed-Release Tablets USP
Rx only
Prescribing information

Cardiovascular Thrombotic Events

• Nonsteroidal anti-inflammatory drugs (NSAIDs) cause an increased risk of serious cardiovascular thrombotic events, including myocardial infarction and stroke, which can be fatal. This risk may occur early in treatment and may increase with duration of use (see ).
• Diclofenac sodium delayed-release tablets are contraindicated in the setting of coronary artery bypass graft (CABG) surgery (see CONTRAINDICATIONS, ).

Gastrointestinal Bleeding, Ulceration, And Perforation

• NSAIDs cause an increased risk of serious gastrointestinal (GI) adverse events including bleeding, ulceration, and perforation of the stomach or intestines, which can be fatal. These events can occur at any time during use and without warning symptoms. Elderly patients and patients with a prior history of peptic ulcer disease and/or GI bleeding are at greater risk for serious GI events (see ).

Pediatric:The pharmacokinetics of diclofenac has not been investigated in pediatric patients.

Race:Pharmacokinetic differences due to race have not been identified.

Hepatic Impairment:Hepatic metabolism accounts for almost 100% of diclofenac elimination, so patients with hepatic disease may require reduced doses of diclofenac compared to patients with normal hepatic function.

Renal Impairment:Diclofenac pharmacokinetics has been investigated in subjects with renal insufficiency. No differences in the pharmacokinetics of diclofenac have been detected in studies of patients with renal impairment. In patients with renal impairment (inulin clearance 60-90, 30-60, and <30 mL/min; N=6 in each group), AUC values and elimination rate were comparable to those in healthy subjects.

Voriconazole:When co-administered with voriconazole (inhibitor of CYP2C9, 2C19 and 3A4 enzyme), the C _maxand AUC of diclofenac increased by 114% and 78%, respectively ( see PRECAUTIONS; Drug Interactions).

Aspirin:When NSAIDs were administered with aspirin, the protein binding of NSAIDs were reduced, although the clearance of free NSAID was not altered. The clinical significance of this interaction is not known. See Table 2for clinically significant drug interactions of NSAIDs with aspirin ( see PRECAUTIONS; Drug Interactions).

Diclofenac sodium delayed-release tablets is a benzene-acetic acid derivative. Diclofenac sodium is a white or slightly yellowish crystalline powder and is sparingly soluble in water at 25°C. The chemical name is 2-[(2,6-dichlorophenyl)amino] benzeneacetic acid, monosodium salt. The molecular weight is 318.14. Its molecular formula is C ₁₄H ₁₀Cl ₂NNaO ₂, and it has the following structural formula

Figure (Dic05 0006 01)

The inactive ingredients in diclofenac sodium delayed-release tablets include: hydroxypropyl methylcellulose, lactose monohydrate, magnesium stearate, methacrylic acid copolymer, microcrystalline cellulose, polyethylene glycol, povidone, propylene glycol, sodium starch glycolate, talc, titanium dioxide, triethyl citrate and ink fine black.

Diclofenac has analgesic, anti-inflammatory, and antipyretic properties.

The mechanism of action of diclofenac, like that of other NSAIDs, is not completely understood but involves inhibition of cyclooxygenase (COX-1 and COX-2).

Diclofenac is a potent inhibitor of prostaglandin synthesis in vitro. Diclofenac concentrations reached during therapy have produced in vivo effects. Prostaglandins sensitize afferent nerves and potentiate the action of bradykinin in inducing pain in animal models. Prostaglandins are mediators of inflammation. Because diclofenac is an inhibitor of prostaglandin synthesis, its mode of action may be due to a decrease of prostaglandins in peripheral tissues.

Diclofenac is 100% absorbed after oral administration compared to IV administration as measured by urine recovery. However, due to first-pass metabolism, only about 50% of the absorbed dose is systemically available (see Table 1). Food has no significant effect on the extent of diclofenac absorption. However, there is usually a delay in the onset of absorption of 1 to 4.5 hours and a reduction in peak plasma levels of <20%.

The apparent volume of distribution (V/F) of diclofenac sodium is 1.4 L/kg.

Diclofenac is more than 99% bound to human serum proteins, primarily to albumin. Serum protein binding is constant over the concentration range (0.15-105 mcg/ml) achieved with recommended doses.

Diclofenac diffuses into and out of the synovial fluid. Diffusion into the joint occurs when plasma levels are higher than those in the synovial fluid, after which the process reverses and synovial fluid levels are higher than plasma levels. It is not known whether diffusion into the joint plays a role in the effectiveness of diclofenac.

Five diclofenac metabolites have been identified in human plasma and urine. The metabolites include 4'-hydroxy-, 5-hydroxy-, 3'-hydroxy-, 4',5-dihydroxy- and 3'-hydroxy-4'-methoxy-diclofenac. The major diclofenac metabolite, 4'-hydroxy-diclofenac, has very weak pharmacologic activity. The formation of 4'-hydroxy- diclofenac is primarily mediated by CYP2C9.

Both diclofenac and its oxidative metabolites undergo glucuronidation or sulfation followed by biliary excretion. Acylglucuronidation mediated by UGT2B7 and oxidation mediated by CYP2C8 may also play a role in diclofenac metabolism. CYP3A4 is responsible for the formation of minor metabolites, 5-hydroxy- and 3'-hydroxy-diclofenac. In patients with renal dysfunction, peak concentrations of metabolites 4'-hydroxy- and 5-hydroxydiclofenac were approximately 50% and 4% of the parent compound after single oral dosing compared to 27% and 1% in normal healthy subjects.

Diclofenac is eliminated through metabolism and subsequent urinary and biliary excretion of the glucuronide and the sulfate conjugates of the metabolites. Little or no free unchanged diclofenac is excreted in the urine. Approximately 65% of the dose is excreted in the urine and approximately 35% in the bile as conjugates of unchanged diclofenac plus metabolites. Because renal elimination is not a significant pathway of elimination for unchanged diclofenac, dosing adjustment in patients with mild to moderate renal dysfunction is not necessary. The terminal half-life of unchanged diclofenac is approximately 2 hours.

Carefully consider the potential benefits and risks of diclofenac sodium delayed-release tablets and other treatment options before deciding to use diclofenac. Use the lowest effective dose for the shortest duration consistent with individual patient treatment goals ( see ).

Diclofenac is indicated:

• For relief of the signs and symptoms of osteoarthritis
• For relief of the signs and symptoms of rheumatoid arthritis
• For acute or long-term use in the relief of signs and symptoms of ankylosing spondylitis

Diclofenac sodium delayed-release tablets are contraindicated in the following patients:

• Known hypersensitivity (e.g., anaphylactic reactions and serious skin reactions) to diclofenac or any components of the drug product ( see , ).
• History of asthma, urticaria, or other allergic-type reactions after taking aspirin or other NSAIDs. Severe, sometimes fatal, anaphylactic reactions to NSAIDs have been reported in such patients ( see , ).
• In the setting of coronary artery bypass graft (CABG) surgery ( see ).

Clinical trials of several COX-2 selective and nonselective NSAIDs of up to three
years duration have shown an increased risk of serious cardiovascular (CV)
thrombotic events, including myocardial infarction (MI), and stroke, which can
be fatal. Based on available data, it is unclear that the risk for CV thrombotic
events is similar for all NSAIDs. The relative increase in serious CV thrombotic
events over baseline conferred by NSAID use appears to be similar in those with
and without known CV disease or risk factors for CVdisease. However, patients
with known CV disease or risk factors had a higher absolute incidence of excess
serious CV thrombotic events, due to their increased baseline rate. Some
observational studies found that this increased risk of serious CV thrombotic
events began as early as the first weeks of treatment. The increase in CV
thrombotic risk has been observed most consistently at higher doses.

To minimize the potential risk for an adverse CV event in NSAID-treated patients,
use the lowest effective dose for the shortest duration possible. Physicians and
patients should remain alert for the development of such events, throughout the
entire treatment course, even in the absence of previous CV symptoms. Patients
should be informed about the symptoms of serious CV events and the

There is no consistent evidence that concurrent use of aspirin mitigates the
increased risk of serious CV thrombotic events associated with NSAID use. The
concurrent use of aspirin and an NSAID, such as diclofenac, increases the risk
of serious gastrointestinal (GI) events (see WARNINGS; Gastrointestinal Bleeding, Ulceration, and Perforation).

Two large, controlled, clinical trials of a COX-2 selective NSAID for the treatment
of pain in the first 10 -14 days following CABG surgery found an increased
incidence of myocardial infarction and stroke. NSAIDs are contraindicated in the
setting of CABG (see CONTRAINDICATIONS).

Observational studies conducted in the Danish National Registry have
demonstrated that patients treated with NSAIDs in the post-MI period were
at increased risk of reinfarction, CV-related death, and all-cause mortality
beginning in the first week of treatment. In this same cohort, the incidence of
death in the first year post-MI was 20 per 100 person years in NSAIDtreated
patients compared to 12 per 100 person years in non-NSAID exposed patients.
Although the absolute rate of death declined somewhat after the first year post-
MI, the increased relative risk of death in NSAID users persisted over at least
the next four years of follow-up. Avoid the use of diclofenac sodium delayedrelease
tablets in patients with a recent MI unless the benefits are expected
to outweigh the risk of recurrent CV thrombotic events. If diclofenac sodium
delayed-release tablets are used in patients with a recent MI, monitor patients
for signs of cardiac ischemia.

NSAIDs, including diclofenac, cause serious gastrointestinal (GI) adverse events
including inflammation, bleeding, ulceration, and perforation of the esophagus,
stomach, small intestine, or large intestine, which can be fatal. These serious
adverse events can occur at any time, with or without warning symptoms, in
patients treated with NSAIDs. Only one in five patients, who develop a serious upper
GI adverse event on NSAID therapy, is symptomatic. Upper GI ulcers, gross bleeding,
or perforation caused by NSAIDs occurred in approximately 1% of patients treated
for 3-6 months, and in about 2%-4% of patients treated for one year. However, even
short-term therapy is not without risk.

Advise patients to report symptoms of ulcerations and bleeding, including epigastric pain, dyspepsia, melena, and hematemesis to their health care provider. In the setting of concomitant use of low-dose aspirin for cardiac prophylaxis, inform patients of the increased risk for the signs and symptoms of GI bleeding (see ).

Patients with a prior history of peptic ulcer disease and/or GI bleeding who use
NSAIDs had a greater than 10-fold increased risk for developing a GI bleed
compared to patients without these risk factors. Other factors that increase the
risk of GI bleeding in patients treated with NSAIDs include longer duration of NSAID
therapy, concomitant use of oral corticosteroids, aspirin, anticoagulants, or selective
serotonin reuptake inhibitors (SSRIs):, smoking, use of alcohol, older age, and poor
general health status. Most postmarketing reports of fatal GI events occurred in
elderly or debilitated patients. Additionally, patients with advanced liver disease
and/or coagulopathy are at increased risk for GI bleeding.

• Use the lowest effective dosage for the shortest possible duration.
• Avoid administration of more than one NSAID at a time
• Avoid use in patients at higher risk unless benefits are expected to outweigh

the increased risk of bleeding. For such patients, as well as those with active GI
bleeding, consider alternate therapies other than NSAIDs.

• Remain alert for signs and symptoms of GI ulceration and bleeding during NSAID

therapy.

• If a serious GI adverse event is suspected, promptly initiate evaluation and

treatment, and discontinue diclofenac sodium delayed-release tablets until a
serious GI adverse event is ruled out.

• In the setting of concomitant use of low-dose aspirin for cardiac prophylaxis,

monitor patients more closely for evidence of GI bleeding (see PRECAUTIONS; Drug Interactions).

In clinical trials of diclofenac- containing products,meaningful elevations (i.e.,more
than 3 times the ULN) of AST (SGOT) were observed in about 2% of approximately
5,700 patients at some time during diclofenac treatment (ALT was not measured
in all studies).

In a large, open-label, controlled trial of 3,700 patients treated with oral diclofenac
sodium for 2-6 months, patients were monitored first at 8 weeks and 1,200 patients
were monitored again at 24 weeks. Meaningful elevations of ALT and/or AST
occurred in about 4% of patients and included marked elevations (greater than 8
times the ULN) in about 1% of the 3,700 patients. In that open-label study, a higher
incidence of borderline (less than 3 times the ULN), moderate (3-8 times the ULN),
and marked (greater than 8 times the ULN) elevations of ALT or AST was observed
in patients receiving diclofenac when compared to other NSAIDs. Elevations in
transaminases were seen more frequently in patients with osteoarthritis than in
those with rheumatoid arthritis.

Almost all meaningful elevations in transaminases were detected before patients
became symptomatic. Abnormal tests occurred during the first 2 months of
therapy with diclofenac in 42 of the 51 patients in all trials who developed marked
transaminase elevations.

In postmarketing reports, cases of drug-induced hepatotoxicity have been reported
in the first month, and in some cases, the first 2 months of therapy, but can occur at
any time during treatment with diclofenac. Postmarketing surveillance has reported
cases of severe hepatic reactions, including liver necrosis, jaundice, fulminant
hepatitis with and without jaundice, and liver failure. Some of these reported cases
resulted in fatalities or liver transplantation.

In a European retrospective population-based, case-controlled study, 10 cases of
diclofenac associated drug-induced liver injury with current use compared with
non-use of diclofenac were associated with a statistically significant 4-fold adjusted
odds ratio of liver injury. In this particular study, based on an overall number of 10
cases of liver injury associated with diclofenac, the adjusted odds ratio increased
further with female gender, doses of 150 mg or more, and duration of use for more
than 90 days.

Physicians should measure transaminases at baseline and periodically in patients
receiving long-term therapy with diclofenac, because severe hepatotoxicity may
develop without a prodrome of distinguishing symptoms. The optimum times for
making the first and subsequent transaminase measurements are not known.
Based on clinical trial data and postmarketing experiences, transaminases should
be monitored within 4 to 8 weeks after initiating treatment with diclofenac. However,
severe hepatic reactions can occur at any time during treatment with diclofenac.

If abnormal liver tests persist or worsen, if clinical signs and/or symptoms consistent
with liver disease develop, or if systemic manifestations occur (e.g., eosinophilia,
rash, abdominal pain, diarrhea, dark urine, etc.), diclofenac should be discontinued
immediately.

Inform patients of the warning signs and symptoms of hepatotoxicity (e.g., nausea,
fatigue, lethargy, diarrhea, pruritus, jaundice, right upper quadrant tenderness,
and “flu-like” symptoms). If clinical signs and symptoms consistent with liver
disease develop, or if systemic manifestations occur (e.g., eosinophilia, rash, etc.),
discontinue diclofenac immediately, and perform a clinical evaluation of the patient.

To minimize the potential risk for an adverse liver related event in patients treated
with diclofenac, use the lowest effective dose for the shortest duration possible.
Exercise caution when prescribing diclofenac with concomitant drugs that are
known to be potentially hepatotoxic (e.g., acetaminophen, antibiotics, antiepileptics).

Inform patients of the warning signs and symptoms of hepatotoxicity (e.g., nausea, fatigue, lethargy, pruritus, diarrhea, jaundice, right upper quadrant tenderness, and “flu-like” symptoms). If these occur, instruct patients to stop diclofenac and seek immediate medical therapy (see ).

NSAIDs, including diclofenac, can lead to new onset of hypertension or worsening of
preexisting hypertension, either of which may contribute to the increased incidence
of CV events. Patients taking angiotensin converting enzyme (ACE) inhibitors,
thiazides diuretics, or loop diuretics may have impaired response to these therapies
when taking NSAIDs. (see PRECAUTIONS; Drug Interactions).

Monitor blood pressure (BP) during the initiation of NSAID treatment and throughout
the course of therapy.

The Coxib and traditional NSAID Trialists’ Collaboration meta-analysis of randomized
controlled trials demonstrated an approximately two-fold increase in hospitalizations
for heart failure in COX-2 selective-treated patients and nonselective NSAID-treated
patients compared to placebo-treated patients. In a Danish National Registry study
of patients with heart failure, NSAID use increased the risk of MI, hospitalization for
heart failure, and death.

Additionally, fluid retention and edema have been observed in some patients treated
with NSAIDs. Use of diclofenac may blunt the CV effects of several therapeutic
agents used to treat these medical conditions [e.g, diuretics, ACE inhibitors, or
angiotensin receptor blockers (ARBs)] (see PRECAUTIONS; Drug Interactions).
Avoid the use of diclofenac in patients with severe heart failure unless the benefits
are expected to outweigh the risk of worsening heart failure. If diclofenac is used

in patients with severe heart failure, monitor patients for signs of worsening heart failure.

Advise patients to be alert for the symptoms of congestive heart failure including shortness of breath, unexplained weight gain, or edema and to contact their healthcare provider if such symptoms occur (see ).

Long-term administration of NSAIDs has resulted in renal papillary necrosis and other renal
injury.

Renal toxicity has also been seen in patients in whom renal prostaglandins have a
compensatory role in the maintenance of renal perfusion. In these patients, administration
of a NSAID may cause a dose-dependent reduction in prostaglandin formation and,
secondarily, in renal blood flow, which may precipitate overt renal decompensation.
Patients at greatest risk of this reaction are those with impaired renal function, dehydration,
hypovolemia, heart failure, liver dysfunction, those taking diuretics and ACE inhibitors or
ARBs, and the elderly. Discontinuation of NSAID therapy is usually followed by recovery
to the pretreatment state. No information is available from controlled clinical studies
regarding the use of diclofenac in patients with advanced renal disease. The renal effects
of diclofenac may hasten the progression of renal dysfunction in patients with pre-existing
renal disease.

Correct volume status in dehydrated or hypovolemic patients prior to initiating diclofenac.
Monitor renal function in patients with renal or hepatic impairment,heart failure,dehydration,
or hypovolemia during use of diclofenac (see PRECAUTIONS; Drug Interactions). Avoid the
use of diclofenac in patients with advanced renal disease unless the benefits are expected
to outweigh the risk of worsening renal function. If diclofenac is used in patients with
advanced renal disease, monitor patients for signs of worsening renal function.

Increases in serum potassium concentration, including hyperkalemia, have been reported
with use of NSAIDs, even in some patients without renal impairment. In patients with normal
renal function, these effects have been attributed to a hyporeninemic-hypoaldosteronism
state.

Diclofenac has been associated with anaphylactic reactions in patients with and without
known hypersensitivity to diclofenac and in patients with aspirin-sensitive asthma (see
CONTRAINDICATIONS, WARNINGS;Exacerbation of Asthma Related to Aspirin Sensitivity).

Inform patients of the signs of an anaphylactic reaction (e.g., difficulty breathing, swelling of the face or throat). Instruct patients to seek immediate emergency help if these occur (see ).

A subpopulation of patients with asthma may have aspirin-sensitive asthma which may
include chronic rhinosinusitis complicated by nasal polyps; severe, potentially fatal
bronchospasm; and/or intolerance to aspirin and other NSAIDs. Because crossreactivity
between aspirin and other NSAIDs has been reported in such aspirinsensitive patients,
diclofenac is contraindicated in patients with this form of aspirin sensitivity (see
CONTRAINDICATIONS). When diclofenac is used in patients with preexisting asthma
(without known aspirin sensitivity),monitor patients for changes in the signs and symptoms
of asthma.

NSAIDs, including diclofenac, can cause serious skin adverse reactions such as exfoliative
dermatitis, Stevens-Johnson Syndrome (SJS), and toxic epidermal necrolysis (TEN), which
can be fatal. NSAIDs can also cause fixed drug eruption (FDE). FDE may present as a
more severe variant known as generalized bullous fixed drug eruption (GBFDE), which
can be life-threatening. These serious events may occur without warning. Inform patients
about the signs and symptoms of serious skin reactions, and to discontinue the use
of diclofenac at the first appearance of skin rash or any other sign of hypersensitivity.
Diclofenac is contraindicated in patients with previous serious skin reactions to NSAIDs
(see CONTRAINDICATIONS).

Drug Reaction with Eosinophilia and Systemic Symptoms (DRESS) has been reported
in patients taking NSAIDs such as Diclofenac Sodium. Some of these events have been
fatal or life-threatening. DRESS typically, although not exclusively, presents with fever,
reaction, lymphadenopathy, and/or facial swelling. Other clinical anifestations may include
hepatitis, nephritis, hematological abnormalities, myocarditis, or myositis. Sometimes
symptoms of DRESS may resemble an acute viral infection. Eosinophilia is often present.
Because this disorder is variable in its presentation, other organ systems not noted here
may be involved. It is important to note that early manifestations of hypersensitivity, such
as fever or lymphadenopathy, may be present even though rash is not evident. If such
signs or symptoms are present, discontinue Diclofenac Sodium and evaluate the patient
immediately.

Avoid use of NSAIDs, including Diclofenac Sodium, in pregnant women at about 30 weeks
gestation and later. NSAIDs including Diclofenac Sodium, increase the risk of premature
closure of the fetal ductus arteriosus at approximately this gestational age.

Use of NSAIDs, including Diclofenac Sodium, at about 20 weeks gestation or later in
pregnancy may cause fetal renal dysfunction leading to oligohydramnios and, in some
cases, neonatal renal impairment.These adverse outcomes are seen, on average, after days
to weeks of treatment, although oligohydramnios has been infrequently reported as soon
as 48 hours after NSAID initiation. Oligohydramnios is often, but not always, reversible with
treatment discontinuation. Complications of prolonged oligohydramnios may, for example,
include limb contractures and delayed lung maturation. In some postmarketing cases of
impaired neonatal renal function, invasive procedures such as exchange transfusion or
dialysis were required. If NSAID treatment is necessary between about 20 weeks and 30
weeks gestation, limit Diclofenac Sodium use to the lowest effective dose and shortest
duration possible. Consider ultrasound monitoring of amniotic fluid if Diclofenac Sodium
treatment extends beyond 48 hours. Discontinue Diclofenac Sodium if oligohydramnios
occurs and follow up according to clinical practice [see PRECAUTIONS; Pregnancy].

Anemia has occurred in NSAID-treated patients. This may be due to occult or gross blood
loss, fluid retention, or an incompletely described effect on erythropoiesis. If a patient
treated with diclofenac, has any signs or symptoms of anemia, monitor hemoglobin or
hematocrit. NSAIDs, including diclofenac, may increase the risk of bleeding events. Comorbid
conditions such as coagulation disorders, concomitant use of warfarin, other
anticoagulants, antiplatelet agents (e.g., aspirin), serotonin reuptake inhibitors (SSRIs) and
serotonin norepinephrine reuptake inhibitors (SNRIs) may increase this risk. Monitor these
patients for signs of bleeding (see PRECAUTIONS; Drug Interactions).

Diclofenac sodium delayed-release tablets cannot be expected to substitute for corticosteroids or to treat corticosteroid insufficiency. Abrupt discontinuation of corticosteroids may lead to disease exacerbation. Patients on prolonged corticosteroid therapy should have their therapy tapered slowly if a decision is made to discontinue corticosteroids and the patient should be observed closely for any evidence of adverse effects, including adrenal insufficiency and exacerbation of symptoms of arthritis.

The pharmacological activity of diclofenac in reducing fever and inflammation may diminish the utility of these diagnostic signs in detecting complications of presumed noninfectious, painful conditions.

Advise the patient to read the FDA-approved patient labeling (Medication Guide) that accompanies each prescription dispensed. Inform patients, families, or their caregivers of the following information before initiating therapy with diclofenac and periodically during the course of ongoing therapy.

Advise patients to be alert for the symptoms of cardiovascular thrombotic events, including chest pain, shortness of breath, weakness, or slurring of speech, and to report any of these symptoms to their healthcare provider immediately (see ).

Advise patients to stop taking diclofenac sodium immediately if they develop any type of rash or fever and to contact their healthcare provider as soon as possible (see ).

Advise females of reproductive potential who desire pregnancy that NSAIDs, including diclofenac, may be associated with a reversible delay in ovulation (see PRECAUTIONS; Carcinogenesis, Mutagenesis, Impairment of Fertility).

Inform pregnant women to avoid use of diclofenac sodium and other NSAIDs, starting at 30 weeks gestation because of the risk of the premature closure of the fetal ductus arteriosus. If treatment with diclofenac sodium is needed for a pregnant woman between about 20 to 30 gestation, advise her that she may need to be monitored for oligohydramnios, if treatment continues for longer than 48 hours [see WARNINGS; Fetal Toxicity; PRECAUTIONS; Pregnancy]

Inform patients that the concomitant use of diclofenac with other NSAIDs or salicylates (e.g., diflunisal, salsalate) is not recommended due to the increased risk of gastrointestinal toxicity, and little or no increase in efficacy (see and Drug Interactions). Alert patients that NSAIDs may be present in “over the counter” medications for treatment of colds, fever, or insomnia.

Inform patients not to use low-dose aspirin concomitantly with diclofenac until they talk to their healthcare provider (see PRECAUTIONS; Drug Interactions).

The pharmacological activity of diclofenac in reducing inflammation, and possibly fever, may diminish the utility of diagnostic signs in detecting infections.

Because serious GI bleeding, hepatotoxicity, and renal injury can occur without warning symptoms or signs, consider monitoring patients on long term NSAID treatment with a CBC and a chemistry profile periodically (see , and ).

See Table 2for clinically significant drug interactions with diclofenac.

Long-term carcinogenicity studies in rats given diclofenac sodium up to 2 mg/kg/day (approximately 0.1 times maximum recommended human dose (MRHD) of diclofenac, 200 mg/day, based on body surface area (BSA) comparison ) have revealed no significant increases in tumor incidence. A 2-year carcinogenicity study conducted in mice employing diclofenac sodium at doses up to 0.3 mg/kg/day (approximately 0.007 times the MRHD based on BSA comparison) in males and 1 mg/kg/day (approximately 0.02 times the MRHD based on BSA comparison) in females did not reveal any oncogenic potential.

Diclofenac sodium did not show mutagenic activity in in vitropoint mutation assays in mammalian (mouse lymphoma) and microbial (yeast, Ames) test systems and was nonmutagenic in several mammalian in vitroand in vivotests, including dominant lethal and male germinal epithelial chromosomal studies in mice, and nucleus anomaly and chromosomal aberration studies in Chinese hamsters.

Diclofenac sodium administered to male and female rats at 4 mg/kg/day (approximately 0.2 times the MRHD based on BSA comparison) did not affect fertility.

Based on the mechanism of action, the use of prostaglandin-mediated NSAIDs, including diclofenac, may delay or prevent rupture of ovarian follicles, which has been associated with reversible infertility in some women. Published animal studies have shown that administration of prostaglandin synthesis inhibitors has the potential to disrupt prostaglandin mediated follicular rupture required for ovulation. Small studies in women treated with NSAIDs have also shown a reversible delay in ovulation. Consider withdrawal of NSAIDs, including diclofenac, in women who have difficulties conceiving or who are undergoing investigation of infertility.

Use of NSAIDs, including diclofenac, can cause premature closure of the fetal ductus arteriosusand fetal renal dysfunction leading to oligohydramnios and, in some cases, neonatal renal impairment. Because of these risks, limit dose and duration of Diclofenac Sodium use between about 20 and 30 weeks of gestation, and avoid Diclofenac Sodium use at about 30 weeks of gestation and later in pregnancy.

Premature Closure of Fetal Ductus Arteriosus
Use of NSAIDs, including Diclofenac Sodium, at about 30 weeks gestation or later in pregnancy increases the risk of premature closure of the fetal ductus arteriosus.

Oligohydramnios/Neonatal Renal Impairment
Use of NSAIDs at about 20 weeks gestation or later in pregnancy has been associated with cases of fetal renal dysfunction leading to oligohydramnios, and in some cases, neonatal renal impairment.

Data from observational studies regarding other potential embryofetal risks of NSAID use in women in the first or second trimesters of pregnancy are inconclusive. In animal reproduction studies, no evidence of teratogenicity was observed in mice, rats or rabbits given diclofenac during the period of organogenesis at doses up to approximately 0.5 and 1 times, respectively, the maximum recommended human dose (MRHD) of diclofenac sodium delayedrelease, 200mg/day, despite the presence of maternal and fetal toxicity at these doses (see ).

The estimated background risk of major birth defects and miscarriage for the indicated population(s) is unknown. All pregnancies have a background risk of birth defect, loss, or other adverse outcomes. In the U.S. general population, the estimated background risk of major birth defects and miscarriage in clinically recognized pregnancies is 2-4% and 15-20%, respectively. [see WARNINGS; Fetal Toxicity].

Fetal/Neonatal Adverse Reactions
Premature Closure of Fetal Ductus Arteriosus:
Avoid use of NSAIDs in women at about 30 weeks gestation and later in pregnancy, because NSAIDs, including Diclofenac Sodium, can cause premature closure of the fetal ductus arteriosus (see WARNINGS; Fetal Toxicity).
Oligohydramnios/Neonatal Renal Impairment
If an NSAID is necessary at about 20 weeks gestation or later in pregnancy, limit the use to the lowest effective dose and shortest duration possible. If Diclofenac Sodium treatment extends beyond 48 hours, consider monitoring with ultrasound for oligohydramnios. If oligohydramnios occurs, discontinue Diclofenac Sodium and follow up according to clinical practice (see WARNINGS; Fetal Toxicity).

Premature Closure of Fetal Ductus Arteriosus:
Oligohydramnios/Neonatal Renal Impairment:
Published studies and postmarketing reports describe maternal NSAID use at about 20 weeks gestation or later in pregnancy associated with fetal renal dysfunction leading to oligohydramnios, and in some cases, neonatal renal impairment. These adverse outcomes are seen, on average, after days to weeks of treatment, although oligohydramnios has been infrequently reported as soon as 48 hours after NSAID initiation. In many cases, but not all, the decrease in amniotic fluid was transient and reversible with cessation of the drug.There have been a limited number of case reports of maternal NSAID use and neonatal renal dysfunction without oligohydramnios, some of which were irreversible. Some cases of neonatal renal dysfunction required treatment with invasive procedures, such as exchange transfusion or dialysis.
Methodological limitations of these postmarketing studies and reports include lack of a control group; limited information regarding dose, duration, and timing of drug exposure; and concomitant use of other medications. These limitations preclude establishing a reliable estimate of the risk of adverse fetal and neonatal outcomes with maternal NSAID use. Because the published safety data on neonatal outcomes involved mostly preterm infants, the generalizability of certain reported risks to the full-term infant exposed to NSAIDs through maternal use is uncertain.

Reproductive and developmental studies in animals demonstrated that diclofenac sodium administration during organogenesis did not produce teratogenicity despite the induction of maternal toxicity and fetal toxicity in mice at oral doses up to 20 mg/kg/day (approximately 0.5 times the maximum recommended human dose [MRHD] of diclofenac, 200 mg/day, based on body surface area (BSA) comparison), and in rats and rabbits at oral doses up to 10 mg/kg/day (approximately 0.5 and 1 times, respectively, the MRHD based on BSA comparison). In a study in which pregnant rats were orally administered 2 or 4 mg/kg diclofenac (0.1 and 0.2 times the MRHD based on BSA) from Gestation Day 15 through Lactation Day 21, significant maternal toxicity (peritonitis, mortality) was noted. These maternally toxic doses were associated with dystocia, prolonged gestation, reduced fetal weights and growth, and reduced fetal survival. Diclofenac has been shown to cross the placental barrier in mice, rats, and humans.

There are no studies on the effects of diclofenac during labor or delivery. In animal studies, NSAIDS, including diclofenac, inhibit prostaglandin synthesis, cause delayed parturition, and increase the incidence of stillbirth.

Risk Summary
Based on available data, diclofenac may be present in human milk.The developmental and health benefits of breastfeeding should be considered along with the mother’s clinical need for diclofenac and any potential adverse effects on the breastfed infant from the diclofenac or from the underlying maternal condition.

Data
One woman treated orally with a diclofenac salt, 150 mg/day, had a milk diclofenac level of 100 mcg/L, equivalent to an infant dose of about 0.03 mg/kg/ day. Diclofenac was not detectable in breast milk in 12 women using diclofenac (after either 100 mg/day orally for 7 days or a single 50 mg intramuscular dose administered in the immediate postpartum period).

Safety and effectiveness in pediatric patients have not been established.

Elderly patients, compared to younger patients, are at greater risk for NSAID-associated serious cardiovascular, gastrointestinal, and/or renal adverse reactions. If the anticipated benefit for the elderly patient outweighs these potential risks, start dosing at the low end of the dosing range, and monitor patients for adverse effects (see , , , , PRECAUTIONS; Laboratory Monitoring) .

Diclofenac is known to be substantially excreted by the kidney, and the risk of adverse reactions to this drug may be greater in patients with impaired renal function. Because elderly patients are more likely to have decreased renal function, care should be taken in dose selection, and it may be useful to monitor renal function (See CLINICAL PHARMACOLOGY, ).

The following adverse reactions are discussed in greater detail in other sections of the labeling:

• Cardiovascular Thrombotic Events (see WARNINGS)
• GI Bleeding, Ulceration and Perforation (see WARNINGS)
• Hepatotoxicity (see WARNINGS)
• Hypertension (see WARNINGS)
• Heart Failure and Edema (see WARNINGS)
• Renal Toxicity and Hyperkalemia (see WARNINGS)
• Anaphylactic Reactions (see WARNINGS)
• Serious Skin Reactions (see WARNINGS)
• Hematologic Toxicity (see WARNINGS)

Because clinical trials are conducted under widely varying conditions, adverse reaction rates observed in the clinical trials of a drug cannot be directly compared to rates in the clinical trials of another drug and may not reflect the rates observed

in practice.

In patients taking diclofenac sodium delayed-release tablets, or other NSAIDs, the most frequently reported adverse experiences occurring in approximately 1%-10% of patients are:

Gastrointestinal experiences including: abdominal pain, constipation, diarrhea, dyspepsia, flatulence, gross bleeding/perforation, heartburn, nausea, GI ulcers (gastric/duodenal) and vomiting.
Abnormal renal function, anemia, dizziness, edema, elevated liver enzymes, headaches, increased bleeding time, pruritus, rashes and tinnitus.

Additional adverse experiences reported occasionally include:

Body as a Whole: fever, infection, sepsis
Cardiovascular System: congestive heart failure, hypertension, tachycardia, syncope
Digestive System:dry mouth, esophagitis, gastric/peptic ulcers, gastritis, gastrointestinal bleeding, glossitis, hematemesis, hepatitis, jaundice
Hemic and Lymphatic System: ecchymosis, eosinophilia, leukopenia, melena, purpura, rectal bleeding, stomatitis, thrombocytopenia
Metabolic and Nutritional: weight changes
Nervous System: anxiety, asthenia, confusion, depression, dream abnormalities, drowsiness, insomnia,malaise, nervousness, paresthesia, somnolence, tremors, vertigo
Respiratory System: asthma, dyspnea
Skin and Appendages: alopecia, photosensitivity, sweating increased
Special Senses: blurred vision
Urogenital System: cystitis, dysuria, hematuria, interstitial nephritis, oliguria/ polyuria, proteinuria, renal failure

Other adverse reactions, which occur rarely are:
Body as a Whole:anaphylactic reactions, appetite changes, death
Cardiovascular System: arrhythmia, hypotension, myocardial infarction, palpitations, vasculitis
Digestive System: colitis, eructation, fulminant hepatitis with and without jaundice, liver failure, liver necrosis, pancreatitis
Hemic and Lymphatic System: agranulocytosis, hemolytic anemia, aplastic anemia, lymphadenopathy, pancytopenia
Metabolic and Nutritional:hyperglycemia
Nervous System: convulsions, coma, hallucinations, meningitis
Respiratory System: respiratory depression, pneumonia
Skin and appendages: Angioedema, toxic epidermal necrosis, erythema multiforme, exfoliative dermatitis, Stevens-Johnson syndrome, fixed drug eruption (FDE), urticaria
Special Senses: conjunctivitis, hearing impairment

Symptoms following acute NSAID overdosages have been typically limited to lethargy, drowsiness, nausea, vomiting, and epigastric pain, which have been generally reversible with supportive care. Gastrointestinal bleeding has occurred. Hypertension, acute renal failure, respiratory depression and coma have occurred, but were rare. (see WARNINGS; Cardiovascular Thrombotic Events, , , ) .

Manage patients with symptomatic and supportive care following an NSAID overdosage. There are no specific antidotes. Consider emesis and/or activated charcoal (60 to 100 grams in adults, 1 to 2 grams per kg of body weight in pediatric patients) and/or osmotic cathartic in symptomatic patients seen within four hours of ingestion or in patients with a large overdose (5 to 10 times the recommended dosage). Forced diuresis, alkalinization of urine, hemodialysis, or hemoperfusion may not be useful due to high protein binding.

For additional information about overdosage treatment contact a poison control center (1-800-222-1222).

Carefully consider the potential benefits and risks of diclofenac sodium delayed-release tablets and other treatment options before deciding to use diclofenac. Use the lowest effective dose for the shortest duration consistent with individual patient treatment goals (see ) .

After observing the response to initial therapy with diclofenac, the dose and frequency should be adjusted to suit an individual patient's needs.

For the relief of osteoarthritis, the recommended dosage is 100-150 mg/day in divided doses (50 mg twice a day or three times a day, or 75 mg twice a day).

For the relief of rheumatoid arthritis, the recommended dosage is 150-200 mg/day in divided doses (50 mg three times a day. or four times a day, or 75 mg twice a day.).

For the relief of ankylosing spondylitis, the recommended dosage is 100-125 mg/day, administered as 25 mg four times a day, with an extra 25-mg dose at bedtime if necessary.

Diclofenac sodium delayed-release tablets

75 mg -– white to off-white, biconvex, round shaped, unscored with "7" engraved on one side and blank on the other side, supplied in bottles of 60, 100, 500 and 1000.

Bottles of 30 ..................................................................NDC 68788-4194-3

Bottles of 60 ..................................................................NDC 68788-4194-6

Bottles of 90 ..................................................................NDC 68788-4194-9

Bottles of 100 ..................................................................NDC 68788-4194-1

Bottles of 120 ..................................................................NDC 68788-4194-8

Store at room temperature 20°C to 25°C (68°F to 77°F); excursions permitted between 15°C to 30°C (59°F to 86°F) [see USP Controlled Room Temperature].

Protect from moisture.

Dispense in tight container (USP).

Manufactured and Distributed by:

Carlsbad Technology, Inc.

5923 Balfour Court
Carlsbad, CA 92008 USA

Revised: 06/2025
CTI-20 Rev. A

Repackaged By: Preferred Pharmaceuticals Inc.

Principal Display Panel – Bottle Label

NDC 68788-4194

Diclofenac Sodium

Delayed-Release Tablets USP

75 mg

PHARMACIST: PLEASE DISPENSE WITH MEDICATION GUIDE

Rx Only

Carlsbad Technology, Inc.

Repackaged By: Preferred Pharmaceuticals Inc.