NDC 0054-0532 Droxidopa


NDC Product Code 0054-0532

NDC CODE: 0054-0532

Proprietary Name: Droxidopa What is the Proprietary Name?
The proprietary name also known as the trade name is the name of the product chosen by the medication labeler for marketing purposes.

Non-Proprietary Name: Droxidopa What is the Non-Proprietary Name?
The non-proprietary name is sometimes called the generic name. The generic name usually includes the active ingredient(s) of the product.

Drug Use Information

Drug Use Information
The drug use information is a summary and does NOT have all possible information about this product. This information does not assure that this product is safe, effective, or appropriate. This information is not individual medical advice and does not substitute for the advice of a health care professional. Always ask a health care professional for complete information about this product and your specific health needs.

  • Droxidopa is used to treat symptoms of low blood pressure when standing, caused by a certain medical condition (neurogenic orthostatic hypotension-NOH). This medication can lessen symptoms of low blood pressure when standing (orthostatic hypotension), such as dizziness, lightheadedness, or the "feeling that you are about to black out." Droxidopa is used by people whose daily activities are severely affected by this condition, even after other treatments are used (such as support stockings, water bolus). It is thought to work by making the blood vessels become more narrow, which increases blood pressure.

Product Characteristics

BLUE (C48333)
WHITE (C48325)
Shape: CAPSULE (C48336)
16 MM
Score: 1

NDC Code Structure

  • 0054 - Hikma Pharmaceuticals Usa Inc.

NDC 0054-0532-22

Package Description: 90 CAPSULE in 1 BOTTLE

NDC Product Information

Droxidopa with NDC 0054-0532 is a a human prescription drug product labeled by Hikma Pharmaceuticals Usa Inc.. The generic name of Droxidopa is droxidopa. The product's dosage form is capsule and is administered via oral form. The RxNorm Crosswalk for this NDC code indicates multiple RxCUI concepts are associated to this product: 1490026, 1490034 and 1490038.

Dosage Form: Capsule - A solid oral dosage form consisting of a shell and a filling. The shell is composed of a single sealed enclosure, or two halves that fit together and which are sometimes sealed with a band. Capsule shells may be made from gelatin, starch, or cellulose, or other suitable materials, may be soft or hard, and are filled with solid or liquid ingredients that can be poured or squeezed.

Product Type: Human Prescription Drug What kind of product is this?
Indicates the type of product, such as Human Prescription Drug or Human Over the Counter Drug. This data element matches the “Document Type” field of the Structured Product Listing.

Droxidopa Active Ingredient(s)

What is the Active Ingredient(s) List?
This is the active ingredient list. Each ingredient name is the preferred term of the UNII code submitted.

Inactive Ingredient(s)

About the Inactive Ingredient(s)
The inactive ingredients are all the component of a medicinal product OTHER than the active ingredient(s). The acronym "UNII" stands for “Unique Ingredient Identifier” and is used to identify each inactive ingredient present in a product.

  • SHELLAC (UNII: 46N107B71O)
  • AMMONIA (UNII: 5138Q19F1X)
  • FD&C BLUE NO. 1 (UNII: H3R47K3TBD)

Administration Route(s)

What are the Administration Route(s)?
The translation of the route code submitted by the firm, indicating route of administration.

  • Oral - Administration to or by way of the mouth.

Pharmacological Class(es)

What is a Pharmacological Class?
These are the reported pharmacological class categories corresponding to the SubstanceNames listed above.

  • Catecholamines - [CS]
  • Increased Blood Pressure - [PE] (Physiologic Effect)

Product Labeler Information

What is the Labeler Name?
Name of Company corresponding to the labeler code segment of the Product NDC.

Labeler Name: Hikma Pharmaceuticals Usa Inc.
Labeler Code: 0054
FDA Application Number: ANDA212835 What is the FDA Application Number?
This corresponds to the NDA, ANDA, or BLA number reported by the labeler for products which have the corresponding Marketing Category designated. If the designated Marketing Category is OTC Monograph Final or OTC Monograph Not Final, then the Application number will be the CFR citation corresponding to the appropriate Monograph (e.g. “part 341”). For unapproved drugs, this field will be null.

Marketing Category: ANDA - A product marketed under an approved Abbreviated New Drug Application. What is the Marketing Category?
Product types are broken down into several potential Marketing Categories, such as NDA/ANDA/BLA, OTC Monograph, or Unapproved Drug. One and only one Marketing Category may be chosen for a product, not all marketing categories are available to all product types. Currently, only final marketed product categories are included. The complete list of codes and translations can be found at www.fda.gov/edrls under Structured Product Labeling Resources.

Start Marketing Date: 02-18-2021 What is the Start Marketing Date?
This is the date that the labeler indicates was the start of its marketing of the drug product.

Listing Expiration Date: 12-31-2022 What is the Listing Expiration Date?
This is the date when the listing record will expire if not updated or certified by the product labeler.

Exclude Flag: N - NO What is the NDC Exclude Flag?
This field indicates whether the product has been removed/excluded from the NDC Directory for failure to respond to FDA"s requests for correction to deficient or non-compliant submissions ("Y"), or because the listing certification is expired ("E"), or because the listing data was inactivated by FDA ("I"). Values = "Y", "N", "E", or "I".

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Droxidopa Product Labeling Information

The product labeling information includes all published material associated to a drug. Product labeling documents include information like generic names, active ingredients, ingredient strength dosage, routes of administration, appearance, usage, warnings, inactive ingredients, etc.

Product Labeling Index

Warning: Supine Hypertension

Monitor supine blood pressure prior to and during treatment and more frequently when increasing doses. Elevating the head of the bed lessens the risk of supine hypertension, and blood pressure should be measured in this position. If supine hypertension cannot be managed by elevation of the head of the bed, reduce or discontinue droxidopa [see Warnings and Precautions (5.1)].

1 Indications And Usage

Droxidopa is indicated for the treatment of orthostatic dizziness, lightheadedness, or the “feeling that you are about to black out” in adult patients with symptomatic neurogenic orthostatic hypotension (nOH) caused by primary autonomic failure (Parkinson's disease [PD], multiple system atrophy, and pure autonomic failure), dopamine beta-hydroxylase deficiency, and non-diabetic autonomic neuropathy. Effectiveness beyond 2 weeks of treatment has not been established. The continued effectiveness of droxidopa should be assessed periodically.

2.1 Dosing Information

The recommended starting dose of droxidopa is 100 mg, taken orally three times daily: upon arising in the morning, at midday, and in the late afternoon at least 3 hours prior to bedtime (to reduce the potential for supine hypertension during sleep). Administer droxidopa consistently, either with food or without food. Take droxidopa capsule whole. Titrate to symptomatic response, in increments of 100 mg three times daily every 24 to 48 hours up to a maximum dose of 600 mg three times daily (i.e., a maximum total daily dose of 1,800 mg). Monitor supine blood pressure prior to initiating droxidopa and after increasing the dose. Patients who miss a dose of droxidopa should take their next scheduled dose.

3 Dosage Forms And Strengths

  • Droxidopa Capsules are available in 100 mg, 200 mg, and 300 mg strengths as specified below. •100 mg: Hard gelatin, with an opaque light blue cap and an opaque white body, printed with “54 354” in black ink on the cap and body •200 mg: Hard gelatin, with an opaque light yellow cap and an opaque white body, printed with “54 437” in black ink on the cap and body •300 mg: Hard gelatin, with an opaque light green cap and an opaque white body, printed with “54 862” in black ink on the cap and body

4 Contraindications

Droxidopa is contraindicated in patients who have a history of hypersensitivity to the drug or its ingredients [see Warnings and Precautions(5.4)].

5.1 Supine Hypertension

Droxidopa therapy may cause or exacerbate supine hypertension in patients with nOH. Patients should be advised to elevate the head of the bed when resting or sleeping. Monitor blood pressure, both in the supine position and in the recommended head-elevated sleeping position. Reduce or discontinue droxidopa if supine hypertension persists. If supine hypertension is not well-managed, droxidopa may increase the risk of cardiovascular events, particularly stroke.

5.2 Hyperpyrexia And Confusion

Postmarketing cases of a symptom complex resembling neuroleptic malignant syndrome (NMS) have been reported with droxidopa use during postmarketing surveillance. Observe patients carefully when the dosage of droxidopa is changed or when concomitant levodopa is reduced abruptly or discontinued, especially if the patient is receiving neuroleptics.NMS is an uncommon but life-threatening syndrome characterized by fever or hyperthermia, muscle rigidity, involuntary movements, altered consciousness, and mental status changes. The early diagnosis of this condition is important for the appropriate management of these patients.

5.3 Ischemic Heart Disease, Arrhythmias, And Congestive Heart Failure

Droxidopa may exacerbate existing ischemic heart disease, arrhythmias, and congestive heart failure. Careful consideration should be given to this potential risk prior to initiating therapy in patients with these conditions.

5.4 Allergic Reactions

Hypersensitivity reactions including anaphylaxis, angioedema, bronchospasm, urticaria and rash have been reported in postmarketing experience. Some of these reactions resulted in emergency treatment. If a hypersensitivity reaction occurs, discontinue the drug and initiate appropriate therapy.This product contains FD&C Yellow No. 5 (tartrazine) which may also cause allergic-type reactions (including bronchial asthma) in certain susceptible persons. Although the overall incidence of FD&C Yellow No. 5 (tartrazine) sensitivity in the general population is low, it is frequently seen in patients who also have aspirin hypersensitivity [seeContraindications (4)].

6 Adverse Reactions

  • The following adverse reactions with droxidopa are included in more detail in the Warnings and Precautions section of the label: •Supine Hypertension [see Warnings and Precautions (5.1)] •Hyperpyrexia and Confusion [see Warnings and Precautions (5.2)] •May exacerbate existing ischemic heart disease, arrhythmias, and congestive heart failure [see Warnings andPrecautions (5.3)]

6.1 Clinical Trials Experience

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 clinical practice.The safety evaluation of droxidopa is based on two placebo-controlled studies 1 to 2 weeks in duration (Studies 301 and 302), one 8-week placebo-controlled study (Study 306), and two long-term, open-label extension studies (Studies 303 and 304). In the placebo-controlled studies, a total of 485 patients with Parkinson's disease, multiple system atrophy, pure autonomic failure, dopamine beta-hydroxylase deficiency, or non-diabetic autonomic neuropathy were randomized and treated, 245 with droxidopa and 240 with placebo [see Clinical Studies (14)]. Placebo-Controlled Experience:The most commonly observed adverse reactions (those occurring at an incidence of greater than 5% in the droxidopa group and with at least a 3% greater incidence in the droxidopa group than in the placebo group) in droxidopa-treated patients during the three placebo-controlled trials were headache, dizziness, nausea, and hypertension. The most common adverse reactions leading to discontinuation from droxidopa were hypertension or increased blood pressure and nausea.Table 1. Most Common Adverse Reactions Occurring More Frequently in the Droxidopa GroupStudy 301 and Study 302 (1 to 2 Weeks Randomized Treatment)Study 306(8 to 10 Weeks Randomized Treatment)Placebo(N=132)n (%)Droxidopa Capsules(N=131)n (%)Placebo(N=108)n (%)Droxidopa Capsules (N=114)n (%)Headache4 (3.0)8 (6.1)8 (7.4)15 (13.2)Dizziness2 (1.5)5 (3.8)5 (4.6)11 (9.6)Nausea2 (1.5)2 (1.5)5 (4.6)10 (8.8)Hypertension02 (1.5)1 (0.9)8 (7.0)Note: n=number of patients. Adverse reactions that were reported in greater than 5% of patients in the droxidopa group and with at least a 3% greater incidence in the droxidopa group than in the placebo group were from Study 306.Long-Term, Open-Label Trials with Droxidopa:In the long-term, open-label extension studies, a total of 422 patients, mean age 65 years, were treated with droxidopa for a mean total exposure of approximately one year. The commonly reported adverse events were falls (24%), urinary tract infections (15%), headache (13%), syncope (13%), and dizziness (10%).

6.2 Postmarketing Experience

The following adverse reactions have been identified during post-approval use of droxidopa. Because these reactions are reported voluntarily from a population of uncertain size, it is not always possible to reliably estimate their frequency or establish a causal relationship to drug exposure.Cardiac Disorders:  Chest painEye Disorders:  Blurred visionGastrointestinal Disorders: Pancreatitis, abdominal pain, vomiting, diarrheaGeneral Disorders and Administration Site Conditions:  FatigueNervous System Disorders:  Cerebrovascular accidentPsychiatric Disorders:  Psychosis, hallucination, delirium, agitation, memory disorder

7.1 Drugs That Increase Blood Pressure

Administering droxidopa in combination with other agents that increase blood pressure (e.g., norepinephrine, ephedrine, midodrine, and triptans) would be expected to increase the risk for supine hypertension.

7.2 Parkinson's Medications

Dopa-decarboxylase inhibitors may require dose adjustments for droxidopa.

7.3 Non-Selective Mao Inhibitors

The concomitant use of selective MAO-B inhibitors, such as rasagiline or selegiline, was permitted in the droxidopa clinical trials. However, based on mechanism of action, the use of non-selective MAO inhibitors and linezolid should be avoided as there is a potential for increased blood pressure when taken with droxidopa.

8.1 Pregnancy

Risk Summary:There are no available data on use of droxidopa in pregnant women and risk of major birth defects or miscarriage. Droxidopa did not produce significant reproductive toxicity in pregnant female rats or rabbits or in their fetuses. However, when pregnant female rats were dosed during days 7 to 17 of gestation (the period of fetal organogenesis) with doses of droxidopa corresponding to 0.3, 1 and 3 times the maximum recommended daily dose of 1,800 mg in a 60 kg patient, based on body surface area, and when their male and female offspring (who were exposed only during fetal life) were subsequently bred, the female offspring exhibited a dose-dependent reduction in the number of live fetuses across all three doses and an increased number of embryonic/fetal deaths at the two higher doses (see Data).The estimated background risk of major birth defects and miscarriage in the indicated population is unknown. In the U.S. general population, the estimated background risk of major birth defects and miscarriage in clinically recognized pregnancies is 2 to 4% and 15 to 20%, respectively.Data:Animal Data:During a multigenerational reproductive toxicity study in rats, pregnant females were dosed during days 7 to 17 of gestation (the period of fetal organogenesis) with doses of droxidopa corresponding to 0.3, 1 and 3 times the maximum recommended daily dose of 1,800 mg in a 60 kg patient. Reduced weight gain, renal lesions, and a small number of deaths were observed in females treated with the two higher doses. When their male and female offspring (who were exposed to droxidopa only during fetal life) were subsequently bred, the female offspring exhibited a dose-dependent reduction in the number of live fetuses across all three doses and an increased number of embryonic/fetal deaths at the two higher doses.

8.2 Lactation

Risk Summary:There is no information regarding the presence of droxidopa or its active metabolite(s) in human milk, the effects of droxidopa on the breastfed child, nor the effects of droxidopa on milk production/excretion. Droxidopa is present in rat milk with peak concentrations seen 4 hours after oral drug administration and drug excretion into milk still occurring 48 hours after administration (see Data). However, due to species-specific differences in lactation physiology, animal lactation data typically do not reliably predict levels in humans. Because of the potential for serious adverse reactions, including reduced weight gain in breastfed infants, advise a woman not to breastfeed during treatment with droxidopa.Data:Animal Data:In rats, oral administration of droxidopa resulted in excretion into breast milk with peak concentrations seen 4 hours after administration, and excretion still occurring 48 hours after administration. When the drug was administered to nursing dams during the period of lactation at a dose corresponding to 3 times the maximum recommended daily dose of 1,800 mg in a 60 kg patient when based on body surface area, reduced weight gain and reduced survival were observed in the offspring. Despite the observed decreased weight gain, physical development was normal (with respect to timing and organ morphology).

8.4 Pediatric Use

The safety and effectiveness of droxidopa in pediatric patients have not been established.

8.5 Geriatric Use

A total of 197 patients with symptomatic nOH aged 75 years or above were included in the droxidopa clinical program. No overall differences in safety or effectiveness were observed between these patients and younger patients, and other reported clinical experience has not identified differences in responses between the elderly and younger patients, but greater sensitivity of some older individuals cannot be ruled out.

8.6 Renal Impairment

Droxidopa and its metabolites are primarily cleared renally. Patients with mild or moderate renal impairment (GFR greater than 30 mL/min) were included in clinical trials and did not have a higher frequency of adverse reactions. Clinical experience with droxidopa in patients with severe renal function impairment (GFR less than 30 mL/min) is limited.

10.1 Symptoms

There have been cases of overdose reported during postmarketing surveillance. A patient ingested 7,700 mg of droxidopa and experienced a hypertensive crisis that resolved promptly with treatment. Another patient treated with a total daily dose of 2,700 mg of droxidopa experienced hypertension and an intracranial hemorrhage.

10.2 Treatment

There is no known antidote for droxidopa overdosage. In case of an overdose that may result in an excessively high blood pressure, discontinue droxidopa and treat with appropriate symptomatic and supportive therapy. Counsel patients to remain in a standing or seated position until their blood pressure drops below an acceptable limit.

11 Description

  • Droxidopa Capsules contain droxidopa, which is a synthetic amino acid precursor of norepinephrine, for oral administration. Chemically, droxidopa is (–)-threo-3-(3,4-Dihydroxyphenyl)-L-serine. It has the following structural formula: Droxidopa is a white to light brown powder. It is slightly soluble in water, and practically insoluble in methanol, glacial acetic acid, ethanol, acetone, ether, and chloroform. It is soluble in dilute hydrochloric acid. It has a molecular weight of 213.19 and a molecular formula of C9H11NO5.Droxidopa Capsules also contain the following inactive ingredients: mannitol, pregelatinized starch, and magnesium stearate. The capsule shell is printed with black ink. The black inks contain shellac glaze, iron oxide black, isopropyl alcohol, n-butyl alcohol, propylene glycol, and ammonium hydroxide. The capsule shell contains the following inactive ingredients: 100 mg – gelatin, titanium dioxide, FD&C Blue No. 1, FD&C Red No. 3; 200 mg – gelatin, titanium dioxide, FD&C Yellow No. 5 (tartrazine); 300 mg – gelatin, titanium dioxide, FD&C Blue No. 1, FD&C Yellow No. 5 (tartrazine), and FD&C Yellow No. 6. Droxidopa Capsules differ in size and color by strength [see Dosage Forms andStrengths (3)].

12.1 Mechanism Of Action

The exact mechanism of action of droxidopa in the treatment of neurogenic orthostatic hypotension is unknown. Droxidopa is a synthetic amino acid analog that is directly metabolized to norepinephrine by dopa-decarboxylase, which is extensively distributed throughout the body. Droxidopa is believed to exert its pharmacological effects through norepinephrine and not through the parent molecule or other metabolites. Norepinephrine increases blood pressure by inducing peripheral arterial and venous vasoconstriction. Droxidopa in humans induces small and transient rises in plasma norepinephrine.

12.2 Pharmacodynamics

Peak droxidopa plasma concentrations are associated with increases in systolic and diastolic blood pressures. Droxidopa has no clinically significant effect on standing or supine heart rates in patients with autonomic failure.Cardiac Electrophysiology: No prolongation of the QTc interval was observed with droxidopa at single oral doses up to 2,000 mg, as shown in a dedicated thorough QT study.

12.3 Pharmacokinetics

Absorption:Peak plasma concentrations (Cmax) of droxidopa were reached by 1 to 4 hours post-dose (mean of approximately 2 hours) in healthy volunteers. High-fat meals have a moderate impact on droxidopa exposure with Cmax and area under the plasma concentration-time curve (AUC) decreasing by 35% and 20%, respectively. The Cmax was delayed by approximately 2 hours with a high-fat meal.   Distribution: Pre-clinical studies suggest that droxidopa can cross the blood-brain barrier. Droxidopa exhibits plasma protein binding of 75% at 100 ng/mL and 26% at 10,000 ng/mL. The estimated apparent volume of distribution of droxidopa is about 200 L in humans.Elimination:The total clearance of droxidopa after oral administration (CL/F) was approximately 400 mL/hr following administration of a single 300 mg dose.Metabolism:The metabolism of droxidopa is mediated by catecholamine pathway and not through the cytochrome P450 system. Droxidopa is initially converted to methoxylated dihydroxyphenylserine (3-OM-DOPS), a major metabolite, by catechol-O-methyltransferase (COMT), to norepinephrine by DOPA decarboxylase (DDC), or to protocatechualdehyde by DOPS aldolase. After oral dosing in humans, plasma norepinephrine levels peak within 3 to 4 hours but are generally very low (less than 1 ng/mL) and variable with no consistent relationship with dose. The contribution of the metabolites of droxidopa other than norepinephrine to its pharmacological effects is not well understood.Excretion:The mean elimination half-life of droxidopa is approximately 2.5 hours in humans. The major route of elimination of droxidopa and its metabolites is via the kidneys in both animals and in humans. Studies in animals with radiolabeled drug showed that ~75% of the administered radioactivity was excreted in urine within 24 hours of oral dosing.  Specific Populations:There are no clinically relevant effects of age, body mass index, or sex on the pharmacokinetics of droxidopa. A population pharmacokinetic analysis suggests that hepatic function, assessed by aspartate aminotransferase (AST), alanine aminotransferase (ALT), alkaline phosphatase, and total bilirubin, did not influence the exposure to droxidopa. The controlled clinical trials included patients with mild to moderate renal impairment. No dose adjustments are required in patients with mild to moderate renal impairment.Drug Interaction Studies:No dedicated drug-drug interaction studies were performed for droxidopa. Patients in the Phase 3 trials with droxidopa received concomitant levodopa/carbidopa, dopamine agonists, MAO-B inhibitors, COMT inhibitors and other medications used to treat Parkinson’s disease. Carbidopa, a peripheral dopa-decarboxylase inhibitor, could prevent the conversion of droxidopa to norepinephrine outside of the central nervous system (CNS). Patients taking droxidopa with L-DOPA/dopa-decarboxylase inhibitor combination drugs had decreased clearance of droxidopa, an increase in overall exposure (AUC) to droxidopa of approximately 100%, and an increase in overall exposure to 3-OM-DOPS of approximately 50%. However, in clinical trials, it was found that the decreased clearance was not associated with a significant need for a different treatment dose or increases in associated adverse events. Dopamine agonists, amantadine derivatives, and MAO-B inhibitors do not appear to affect droxidopa clearance, and no dose adjustments are required.

13.1 Carcinogenesis, Mutagenesis, Impairment Of Fertility

Long-term studies have been conducted at dosages up to 1,000 mg/kg/day in mice and up to 100 mg/kg/day in rats with no indication of carcinogenic effects. Based on dose per unit body surface area, these two doses correspond to approximately 3 and 0.5 times, respectively, the maximum recommended total daily dose of 1,800 mg in a 60 kg patient. Droxidopa was clastogenic in Chinese hamster ovary cells (chromosome aberration assay), but was not mutagenic in bacteria (Ames assay), and was not clastogenic in a mouse micronucleus assay.Studies in rats show that droxidopa has no effect on fertility.

13.2 Animal Toxicology And/Or Pharmacology

In long-term chronic toxicity studies, rats and mice treated for 52 and 80 weeks, respectively, at doses up to 300 mg/kg/day in rats and 1,000 mg/kg/day in mice had increased incidences of renal and cardiac lesions (rats and mice) and deaths (rats only). The doses at which these effects were not seen represented 0.2 and 0.3 times, in rats and mice, respectively, the maximum recommended total daily dose of 1,800 mg in a 60 kg patient, when based on body surface area.No signs of toxicity were observed in monkeys or dogs given droxidopa for 13 weeks at doses 32 times (3,000 mg/kg/day) and 37 times (2,000 mg/kg/day), respectively, the maximum human dose.

14.1 Studies In Neurogenic Orthostatic Hypotension

  • Clinical studies (described below) examined the efficacy of droxidopa in the short-term (1 to 2 weeks) and over longer-term periods (8 weeks; 3 months). Studies 301 and 306B showed a treatment effect of droxidopa at Week 1, but none of the studies demonstrated continued efficacy beyond 2 weeks of treatment.Study 306B was a multi-center, double-blind, randomized, placebo-controlled, parallel-group study in patients with symptomatic nOH and Parkinson’s disease. Patients entering the study were required to have a decrease of at least 20 mm Hg or 10 mm Hg, respectively, in systolic or diastolic blood pressure, within 3 minutes after standing, as well as symptoms associated with neurogenic orthostatic hypotension. The study had an initial dose titration period that lasted up to 2 weeks in which patients received placebo or 100 to 600 mg of droxidopa three times daily, followed by an 8-week treatment period.  Efficacy was measured using the OHSA Item #1 score (“dizziness, lightheadedness, feeling faint, and feeling like you might black out”) at Week 1, in patients who had completed titration and 1 week of maintenance therapy.A total of 171 patients were enrolled, and 147 patients were included in the efficacy analysis. The mean age was 72 years, and patients were mostly Caucasian. During the study, 94% of placebo-treated patients and 88% on droxidopa were taking dopa-decarboxylase inhibitors; 17% of placebo-treated patients and 26% on droxidopa were taking fludrocortisone. There were more premature discontinuations in the droxidopa group (28%) than in the placebo group (20%).In both groups, the mean baseline dizziness score was 5.1 on an 11-point scale. At Week 1, patients showed a statistically significant mean 0.9 unit decrease in dizziness with droxidopa versus placebo (P=0.028), but the effect did not persist beyond Week 1. The data at all time points are shown in Figure 1.  Patients receiving droxidopa also had a greater increase, compared to placebo, in the Week 1 lowest standing systolic blood pressure within 3 minutes after standing (5.6 mm Hg; P=0.032).Figure 1. Mean Change in OHSA Item 1 Score by Week in Study 306B  Note: The graph is based on observed data only. The error bars are the 95% confidence interval of the mean change from baseline in OHSA Item 1 scores.Figure 2. Distribution of Patients by Change in OHSA Item 1, Baseline to Week 1, in Study 306BFigure 2 shows the distribution of changes from Baseline to Week 1 in the OHSA Item #1 score. Overall, the figure shows that patients treated with droxidopa improved more than those treated with placebo. Study 301 was a multicenter, multinational, double-blind, randomized, placebo-controlled, parallel-group study in patients with symptomatic neurogenic orthostatic hypotension. The study included an initial open-label dose titration period, a 7-day washout period, and a randomized double-blind 7-day treatment period. To be eligible for enrollment, patients were required to have a decrease in systolic or diastolic blood pressure of at least 20 or 10 mm Hg, respectively, within 3 minutes after standing. The study was enriched, such that only patients who had been identified as "responders" during the titration period were randomized to droxidopa or placebo. To be considered a responder, a patient had to demonstrate improvement on the OHSA Item #1 score by at least 1 point, as well as an increase in systolic blood pressure of at least 10 mm Hg post-standing, during the open-label dose titration period. Patients who dropped out during the titration period because of side effects or other reasons were also not included in the double-blind portion of the study.Patients had a primary diagnosis of Parkinson’s disease (n=60), pure autonomic failure (n=36), or multiple system atrophy (n=26). The mean age was 60 years, and most were Caucasian. 45% of patients were taking dopa-decarboxylase inhibitors, and 29% were taking fludrocortisone. Efficacy was measured using the Orthostatic Hypotension Questionnaire (OHQ), a patient-reported outcome that measures symptoms of nOH and their impact on the patient’s ability to perform daily activities that require standing and walking. The OHQ includes OHSA Item #1 as one of several components. A statistically significant treatment effect was not demonstrated on OHQ (treatment effect of 0.4 unit, P=0.19).The mean baseline dizziness score on OHSA Item #1 (“dizziness, lightheadedness, feeling faint, and feeling like you might black out”) was 5.2 units on an 11-point scale. At Week 1 of treatment, patients showed a mean 0.7 unit decrease in dizziness with droxidopa versus placebo (P=0.06).Study 302 (n=101) was a placebo-controlled, 2-week randomized withdrawal study of droxidopa in patients with symptomatic nOH. Study 303 (n=75) was an extension of Studies 301 and 302, where patients received their titrated dose of droxidopa for 3 months and then entered a 2-week randomized withdrawal phase. Neither study showed a statistically significant difference between treatment arms on its primary endpoint. Considering these data, the effectiveness of droxidopa beyond 2 weeks is uncertain, and patients should be evaluated periodically to determine whether droxidopa is continuing to provide a benefit.

16.1 How Supplied

Droxidopa Capsules are supplied in the following dosage strengths:100 mg strength: Hard gelatin, size 3 capsule, with an opaque light blue cap and an opaque white body, printed with “54 354” in black ink on the cap and body, containing white to light brown powder. NDC 0054-0532-22: Bottle of 90 Capsules200 mg strength: Hard gelatin, size 2 capsule, with an opaque light yellow cap and an opaque white body, printed with “54 437” in black ink on the cap and body, containing white to light brown powder. NDC 0054-0533-22: Bottle of 90 Capsules300 mg strength: Hard gelatin, size 1 capsule, with an opaque light green cap and an opaque white body, printed with “54 862” in black ink on the cap and body, containing white to light brown powder.NDC 0054-0534-22: Bottle of 90 Capsules

16.2 Storage And Handling

Droxidopa Capsules should be stored at 20° to 25°C (68° to 77°F) [See USP Controlled Room Temperature]

17 Patient Counseling Information

Elevations in Blood Pressure:Counsel patients that droxidopa causes elevations in blood pressure and increases the risk of supine hypertension, which could lead to strokes, heart attacks, and death. Instruct patients to rest and sleep in an upper-body elevated position and monitor blood pressure. Instruct patients how to manage observed blood pressure elevations. To reduce the risk of supine hypertension, in addition to raising the upper body, the late afternoon dose of droxidopa should be taken at least three hours before bedtime [see Warnings and Precautions (5.1)].Concomitant Treatments:Counsel patients about the concomitant use of drugs to treat other conditions that may have an additive effect with droxidopa [see Drug Interactions (7)].Allergic Reactions:Counsel patients to discontinue droxidopa and seek immediate medical attention if any signs or symptoms of a hypersensitivity reaction such as anaphylaxis, angioedema, bronchospasm, urticaria or rash occur [see Warnings and Precautions (5.4)].Lactation:Advise women not to breastfeed during treatment with droxidopa [see Use in Specific Populations (8.2)].Food:Patients should take droxidopa the same way each time, either with food or without food [see Dosage and Administration (2.1)].Missed Dose:If a dose is missed, patients should take the next dose at the regularly scheduled time and should not double the dose.Distr. by: Hikma Pharmaceuticals USA Inc.Berkeley Heights, NJ 07922C50000343/01Revised August 2019

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