Other
(A) PREMATURE DISCONTINUATION OF PRADAXA INCREASES THE RISK OF THROMBOTIC EVENTS
Premature discontinuation of any oral anticoagulant, including PRADAXA, increases the risk of thrombotic events. If anticoagulation with PRADAXA is discontinued for a reason other than pathological bleeding or completion of a course of therapy, consider coverage with another anticoagulant [see Dosage and Administration (2.5, 2.6, 2.7) and Warnings and Precautions (5.1)].
(B) SPINAL/EPIDURAL HEMATOMA
Epidural or spinal hematomas may occur in patients treated with PRADAXA who are receiving neuraxial anesthesia or undergoing spinal puncture. These hematomas may result in long-term or permanent paralysis. Consider these risks when scheduling patients for spinal procedures. Factors that can increase the risk of developing epidural or spinal hematomas in these patients include:
- use of indwelling epidural catheters
- concomitant use of other drugs that affect hemostasis, such as non-steroidal anti-inflammatory drugs (NSAIDs), platelet inhibitors, other anticoagulants
- a history of traumatic or repeated epidural or spinal punctures
- a history of spinal deformity or spinal surgery
- optimal timing between the administration of PRADAXA and neuraxial procedures is not known [see Warnings and Precautions (5.3)].
- Baby rice cereal, prepared with water
- Mashed carrots
- Apple sauce
- Mashed banana
- via syringes or feeding tubes
- with milk, milk products, or soft foods containing milk products
- Tell patients or their caregivers to take or administer PRADAXA Oral Pellets exactly as prescribed.
- Tell patients or their caregivers to remove desiccant from the aluminum bag and throw away.
- Remind patients or their caregivers not to discontinue PRADAXA Oral Pellets without talking to the healthcare provider who prescribed it.
- Provide the following instructions on administration to the patients or caregivers:
- Take the prescribed dose of PRADAXA Oral Pellets twice a day, approximately 12 hours apart;
- PRADAXA Oral Pellets may be sprinkled on baby rice cereal prepared with water, mashed carrots, apple sauce, or mashed banana, or may be taken with approximately 1-2 ounces of apple juice;
- PRADAXA Oral Pellets should not be mixed with milk or with foods that contain milk;
- Once the Oral Pellets are mixed with the soft food or apple juice, the patient should take the dose within 30 minutes;
- If a dose of PRADAXA Oral Pellets is not taken at the scheduled time, the dose should be skipped if it cannot be taken at least 6 hours before the next scheduled dose. The dose of PRADAXA Oral Pellets should not be doubled to make up for a missed dose.
- Unusual bruising (bruises that appear without known cause or that get bigger)
- Pink or brown urine
- Red or black, tarry stools
- Coughing up blood
- Vomiting blood, or vomit that looks like coffee grounds
- Pain, swelling or discomfort in a joint
- Headaches, dizziness, or weakness
- Reoccurring nose bleeds
- Unusual bleeding from gums
- Bleeding from a cut that takes a long time to stop
- Menstrual bleeding or vaginal bleeding that is heavier than normal
- Dyspepsia (upset stomach), burning, or nausea
- Abdominal pain or discomfort
- Epigastric discomfort, GERD (gastric indigestion)
Monitor patients frequently for signs and symptoms of neurological impairment. If neurological compromise is noted, urgent treatment is necessary [see Warnings and Precautions (5.3)].
Consider the benefits and risks before neuraxial intervention in patients anticoagulated or to be anticoagulated [see Warnings and Precautions (5.3)].
Pediatric Patients with Renal Impairment
Assess renal function prior to initiation of treatment with PRADAXA Oral Pellets. Periodically assess renal function as clinically indicated (i.e., more frequently in clinical situations that may be associated with a decline in renal function) and adjust therapy accordingly. Discontinue PRADAXA Oral Pellets in patients who develop acute renal failure while on PRADAXA Oral Pellets and consider alternative anticoagulant therapy.
Prior to the initiation of treatment with PRADAXA Oral Pellets, estimate the glomerular filtration rate (eGFR) using the Schwartz formula, eGFR (Schwartz) = (0.413 × height in cm) / serum creatinine in mg/dL.
Due to lack of data in pediatric patients with an eGFR < 50 mL/min/1.73m2 and the risk of increased exposure, avoid use of PRADAXA Oral Pellets in these patients. Treat patients with an eGFR > 50 mL/min/1.73m2 with the dose according to Tables 1 and 2 [see Dosage and Administration (2.2)].
Administration with soft foods
PRADAXA Oral Pellets may be mixed with two teaspoons of the following soft foods at room temperature:
Administration with apple juice
PRADAXA Oral Pellets may be spooned directly into the patient's mouth and swallowed with apple juice or added to approximately 1-2 ounces of apple juice for drinking.
PRADAXA Oral Pellets should not be administered:
See Instructions for Use.
Reversal of Anticoagulant Effect:
Hemodialysis can remove dabigatran; however the clinical experience supporting the use of hemodialysis as a treatment for bleeding is limited [see Overdosage (10)]. Prothrombin complex concentrates or recombinant Factor VIIa may be considered but their use has not been evaluated in clinical trials. Protamine sulfate and vitamin K are not expected to affect the anticoagulant activity of dabigatran. Consider administration of platelet concentrates in cases where thrombocytopenia is present or long-acting antiplatelet drugs have been used.
In adults, a specific reversal agent (idarucizumab) for PRADAXA is available when reversal of the anticoagulant effect of dabigatran is needed. In pediatric patients, the efficacy and safety of idarucizumab have not been established.
Pediatric Trials
Treatment of VTE in Pediatric Patients
The safety of PRADAXA in the treatment of VTE in pediatric patients was studied in one phase III trial (DIVERSITY). The DIVERSITY study was a randomized, open-label, active-controlled, parallel-group trial comparing PRADAXA with standard of care – SOC (vitamin K antagonists, low molecular weight heparin, or fondaparinux). There were 266 pediatric patients who received study treatment, 176 patients treated with PRADAXA and 90 patients treated with SOC. Patients on PRADAXA received age- and weight-adjusted doses of an age-appropriate formulation of PRADAXA (capsules, pellets, or oral solution) twice daily.
Patients had a median age of 14 years (range: 0-17 years), 92% were white, and half the patients were male (50%). Following at least 5 days of parenteral anticoagulant therapy, the median duration of treatment with PRADAXA was 85 days (range: 1-105). Patients with estimated glomerular filtration rate (eGFR) < 50 mL/min/1.73m2 were excluded from the trial.
Bleeding
Data on adjudicated major bleeding, clinically relevant non-major (CRNM) bleeding, and minor bleeding events for the PRADAXA group and the SOC group in the DIVERSITY study are reported in Table 4. There was no statistically significant difference in the time to first major bleeding event.
| PRADAXA N (%) | Standard of Care (SOC) N (%) | |
|---|---|---|
| Patients | N=176 | N=90 |
| 1 Major bleeding event if at least one of the following criteria applied: fatal bleeding, symptomatic bleeding in a critical area or organ (intraocular, intracranial, intraspinal or intramuscular with compartment syndrome, retroperitoneal bleeding, intra-articular bleeding, or pericardial bleeding), bleeding causing a fall in hemoglobin level of 2.0 g/dL (1.24 mmol/L) or more, or leading to transfusion of 2 or more units of whole blood or red cells. | ||
| Major bleeding event1 | 4 (2.3) | 2 (2.2) |
| Fatal bleeding | 0 | 1 (1.1) |
| Clinically relevant non-major bleeding | 2 (1.1) | 1 (1.1) |
| Minor bleeding | 33 (19) | 21 (23) |
| Major and clinically relevant non-major bleeding | 6 (3.4) | 3 (3.3) |
| Any bleeding | 38 (22) | 22 (24) |
Site-specific bleeding rates were comparable between the two arms, with the exception of the rate of any gastrointestinal bleeds (5.7% in PRADAXA arm vs 1.8% in SOC arm).
Gastrointestinal Adverse Reactions
The incidence of gastrointestinal adverse reactions for patients on PRADAXA and SOC was 32% and 12%, respectively, with the following occurring in ≥5% of patients taking PRADAXA: dyspepsia (including term gastro-esophageal reflux disease, gastric pH decreased and esophagitis) in 9% (vs 2%), upper abdominal pain in 5% (vs 1%), vomiting in 8% (vs 2%), nausea 5% (vs 4%), and diarrhea 5% (vs 1%).
Reduction in Risk of Recurrence of VTE in Pediatric Patients
The safety of PRADAXA in the reduction in the risk of recurrence of VTE in pediatric patients was studied in one open-label single-arm trial (Study 2). Study 2 enrolled patients who required further anticoagulation due to the presence of a clinical risk factor after completing the initial treatment for confirmed VTE (for at least 3 months) or after completing the DIVERSITY study and received PRADAXA until the clinical risk factor resolved, or up to a maximum of 12 months. There were 213 pediatric patients treated with PRADAXA, in a similar fashion as in the DIVERSITY trial.
Patients had a median age of 14 years (range: 0-18 years), 91% were white, and 55% of patients were male. Patients previously enrolled on DIVERSITY accounted for 43% of patients enrolled on Study 2 (29% from PRADAXA arm and 14% from SOC arm). The median duration of treatment with PRADAXA in Study 2 was 42 weeks (range: 0-56 weeks), with 45% of patients completing the 12-month planned duration, 17% stopping due to resolution of VTE risk factors, 12% stopping due to failure to attain target dabigatran concentration and 6% had an adverse event leading to discontinuation.
During the on-treatment period of Study 2, 3 patients (1.4%) had a major bleeding event, 3 patients (1.4%) had a clinically relevant non-major bleeding event, and 44 patients (20%) had a minor bleeding event. The most common drug-related adverse reactions were dyspepsia (5%), epistaxis (3.3%), nausea (3.3%) and menorrhagia (2.8%).
The adverse reaction profile in pediatric patients was generally consistent with that of adult patients.
Hypersensitivity Reactions in Adult PRADAXA Trials
In adult DVT/PE pivotal studies, drug hypersensitivity (including urticaria, rash, and pruritus), allergic edema, anaphylactic reaction, and anaphylactic shock were reported in 0.1% of patients receiving PRADAXA Capsules.
Risk Summary
The limited available data on PRADAXA use in pregnant women are insufficient to determine drug-associated risks for adverse developmental outcomes. There are risks to the mother associated with untreated venous thromboembolism in pregnancy and a risk of hemorrhage in the mother and fetus associated with the use of anticoagulants (see Clinical Considerations). In pregnant rats treated from implantation until weaning, dabigatran increased the number of dead offspring and caused excess vaginal/uterine bleeding close to parturition at an exposure 2.6 times the human exposure. At a similar exposure, dabigatran decreased the number of implantations when rats were treated prior to mating and up to implantation (gestation Day 6). Dabigatran administered to pregnant rats and rabbits during organogenesis up to exposures 8 and 13 times the human exposure, respectively, did not induce major malformations. However, the incidence of delayed or irregular ossification of fetal skull bones and vertebrae was increased in the rat (see Data).
The estimated background risk of major birth defects and miscarriage for the indicated population 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.
Clinical Considerations
Disease-associated maternal and/or embryo/fetal risk
Pregnancy confers an increased risk for thromboembolism that is higher for women with underlying thromboembolic disease and certain high-risk pregnancy conditions. Published data describe that women with a previous history of venous thrombosis are at high risk for recurrence during pregnancy.
Fetal/Neonatal adverse reaction
Use of anticoagulants, including PRADAXA, may increase the risk of bleeding in the fetus and neonate. Monitor neonates for bleeding [see Warnings and Precautions (5.2)].
Labor or delivery
All patients receiving anticoagulants, including pregnant women, are at risk for bleeding. PRADAXA use during labor or delivery in women who are receiving neuraxial anesthesia may result in epidural or spinal hematomas. Consider discontinuation or use of shorter acting anticoagulant as delivery approaches [see Warnings and Precautions (5.2, 5.3)].
Data
Animal Data
Dabigatran has been shown to decrease the number of implantations when male and female rats were treated at a dosage of 70 mg/kg (about 2.6 to 3.0 times the human exposure at MRHD of 300 mg/day based on area under the curve [AUC] comparisons) prior to mating and up to implantation (gestation Day 6). Treatment of pregnant rats after implantation with dabigatran at the same dose increased the number of dead offspring and caused excess vaginal/uterine bleeding close to parturition. Dabigatran administered to pregnant rats and rabbits during organogenesis up to maternally toxic doses of 200 mg/kg (8 and 13 times the human exposure, respectively, at a MRHD of 300 mg/day based on AUC comparisons) did not induce major malformations, but increased the incidence of delayed or irregular ossification of fetal skull bones and vertebrae in the rat.
Death of offspring and mother rats during labor in association with uterine bleeding occurred during treatment of pregnant rats from implantation (gestation Day 7) to weaning (lactation Day 21) with dabigatran at a dose of 70 mg/kg (about 2.6 times the human exposure at MRHD of 300 mg/day based on AUC comparisons).
Risk Summary
There are no data on the presence of dabigatran in human milk, the effects on the breastfed child, or on milk production. Dabigatran and/or its metabolites were present in rat milk. Breastfeeding is not recommended during treatment with PRADAXA.
Cardiac Electrophysiology
No prolongation of the QTc interval was observed with dabigatran etexilate at doses up to 600 mg.
Absorption
The absolute bioavailability of dabigatran following oral administration of dabigatran etexilate is approximately 3% to 7%. Dabigatran etexilate is a substrate of the efflux transporter P-gp. After oral administration of dabigatran etexilate in healthy volunteers, Cmax occurs at 1 hour post-administration in the fasted state. Coadministration of PRADAXA with a high-fat meal delays the time to Cmax by approximately 2 hours but has no effect on the bioavailability of dabigatran; PRADAXA may be administered with or without food.
PRADAXA is available in Capsules and Oral Pellets. The approved indications and intended age groups are not the same. Oral absorption of dabigatran etexilate is formulation-dependent. Dabigatran etexilate oral pellets show 37% higher relative bioavailability in healthy adults compared to dabigatran etexilate capsules. In addition, the relative bioavailability between the two dosage forms is age dependent. The relative bioavailability observed in adult patients cannot be translated to pediatric patients.
Distribution
Dabigatran is approximately 35% bound to human plasma proteins. The red blood cell to plasma partitioning of dabigatran measured as total radioactivity is less than 0.3. The volume of distribution of dabigatran is 50 to 70 L.
Elimination
Dabigatran is eliminated primarily in the urine. Renal clearance of dabigatran is 80% of total clearance after intravenous administration. After oral administration of radiolabeled dabigatran, 7% of radioactivity is recovered in urine and 86% in feces. The elimination half-life of dabigatran in pediatric patients receiving pellets is approximately 9 to 11 hours.
Metabolism
After oral administration, dabigatran etexilate is converted to dabigatran. The cleavage of the dabigatran etexilate by esterase-catalyzed hydrolysis to the active principal dabigatran is the predominant metabolic reaction. Dabigatran is not a substrate, inhibitor, or inducer of CYP450 enzymes. Dabigatran is subject to conjugation, forming pharmacologically active acyl glucuronides. Four positional isomers, 1-O, 2-O, 3-O, and 4-O-acylglucuronide exist, and each accounts for less than 10% of total dabigatran in plasma.
Specific Populations
Pediatric Patients
The pharmacokinetics of dabigatran was characterized in two clinical studies (DIVERSITY and Study 2) following multiple doses in pediatric patients from birth to less than 18 years old. In pediatric patients taking age- and weight-adjusted doses of PRADAXA pellets (less than 12 years of age), the observed geometric mean steady-state trough concentration was 54.7 ng/mL (25.9 to 88.3 ng/mL, 10th to 90th percentile) compared to the geometric mean steady-state trough concentration of 59.7 ng/mL (26.3 to 146 ng/mL, 10th to 90th percentile) observed in adult patients with DVT/PE taking PRADAXA capsules.
Renal Impairment
An open, parallel-group, single-center study compared dabigatran pharmacokinetics in healthy adult subjects and adult patients with mild to moderate renal impairment receiving a single dose of PRADAXA capsules 150 mg. Exposure to dabigatran increases with severity of renal function impairment (Table 5). Similar findings were observed in the RE-LY, RE-COVER and RE-NOVATE II trials.
| Renal Function | CrCl (mL/min) | Increase in AUC | Increase in Cmax | t1/2 (h) |
|---|---|---|---|---|
| +Patients with severe renal impairment were not studied in RE-LY, RE-COVER and RE-NOVATE II. | ||||
| Normal | ≥ 80 | 1× | 1× | 13 |
| Mild | 50-80 | 1.5× | 1.1× | 15 |
| Moderate | 30-50 | 3.2× | 1.7× | 18 |
| Severe+ | 15-30 | 6.3× | 2.1× | 27 |
Hepatic Impairment
Administration of PRADAXA Capsules in adult patients with moderate hepatic impairment (Child-Pugh B) showed a large inter-subject variability, but no evidence of a consistent change in exposure or pharmacodynamics.
Drug Interactions
No clinical drug interaction studies have been conducted in pediatric subjects. A summary of the effect of coadministered drugs on dabigatran exposure in adult subjects is shown in Figures 1 and 2.
Figure 1 Effect of P-gp Inhibitor or Inducer (rifampicin) Drugs on Peak and Total Exposure to Dabigatran (Cmax and AUC). Shown are the Geometric Mean Ratios (Ratio) and 90% Confidence Interval (90% CI). The Perpetrator and Dabigatran Etexilate Dose and Dosing Frequency are given as well as the Time of Perpetrator Dosing in Relation to Dabigatran Etexilate Dose (Time Difference)
Figure 2 Effect of Non-P-gp Inhibitor or Inducer, Other Drugs, on Peak and Total Exposure to Dabigatran (Cmax and AUC). Shown are the Geometric Mean Ratios (Ratio) and 90% Confidence Interval (90% CI). The Perpetrator and Dabigatran Etexilate Dose and Dosing Frequency are given as well as the Time of Perpetrator Dosing in Relation to Dabigatran Etexilate Dose (Time Difference)
Impact of Dabigatran on Other Drugs
In clinical studies exploring CYP3A4, CYP2C9, P-gp, and other pathways, dabigatran did not meaningfully alter the pharmacokinetics of amiodarone, atorvastatin, clarithromycin, diclofenac, clopidogrel, digoxin, pantoprazole, or ranitidine.
Instructions for Patients
[see Boxed Warning, and Dosage and Administration (2.2, 2.4)]
Bleeding
Inform patients or their caregivers that they may bleed more easily, may bleed longer, and should call their healthcare provider for any signs or symptoms of bleeding [see Warnings and Precautions (5.2)].
Instruct patients or their caregivers to seek emergency care right away if they have any of the following, which may be a sign or symptom of serious bleeding:
Instruct patients or their caregivers to call their healthcare provider or to get prompt medical attention if they experience any signs or symptoms of bleeding:
If patients have had neuraxial anesthesia or spinal puncture, and particularly, if they are taking concomitant NSAIDs or platelet inhibitors, advise patients or their caregivers to watch for signs and symptoms of spinal or epidural hematoma, such as back pain, tingling, numbness (especially in the lower limbs), muscle weakness, and stool or urine incontinence. If any of these symptoms occur, advise the patient or their caregivers to contact his or her physician immediately [see Boxed Warning].
Gastrointestinal Adverse Reactions
Instruct patients or their caregivers to call their healthcare provider if they experience any signs or symptoms of dyspepsia or gastritis:
[see Adverse Reactions (6.1)]
Invasive or Surgical Procedures
Instruct patients or their caregivers to inform their healthcare provider that they are taking PRADAXA before any invasive procedure (including dental procedures) is scheduled [see Dosage and Administration (2.7)].
Concomitant Medications
Ask patients or their caregivers to list all prescription medications, over-the-counter medications, or dietary supplements they are taking or plan to take so the patient's healthcare provider knows about other treatments that may affect bleeding risk (e.g., aspirin or NSAIDs) or dabigatran exposure (e.g., dronedarone or systemic ketoconazole) [see Warnings and Precautions (5.2, 5.5)].
Prosthetic Heart Valves
Instruct patients or their caregivers to inform their healthcare provider if they will have or have had surgery to place a prosthetic heart valve [see Warnings and Precautions (5.4)].
Allergic Reactions
Advise caregivers that some adults taking PRADAXA have developed symptoms of an allergic reaction. Advise caregivers to inform their child's healthcare provider if their child develops symptoms of an allergic reaction, such as hives, rash, or itching. Advise caregivers to seek emergency medical attention for their child if they develop chest pain or tightness, swelling of the face or tongue, trouble breathing or wheezing, or feeling dizzy or faint.
Pregnancy
Advise patients to inform their healthcare provider immediately if they become pregnant or intend to become pregnant during treatment with PRADAXA [see Use in Specific Populations (8.1)].
Lactation
Advise patients not to breastfeed if they are taking PRADAXA [see Use in Specific Populations (8.2)].
Distributed by:
Boehringer Ingelheim Pharmaceuticals, Inc.
Ridgefield, CT 06877 USA
PRADAXA is a registered trademark of and used under license from Boehringer Ingelheim International GmbH.
Copyright © 2021 Boehringer Ingelheim Pharmaceuticals, Inc.
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