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Package insert / prescribing information

Generic name: phentermine hydrochloride

Dosage form: tablets, capsules

Drug classes: Anorexiants, CNS stimulants

Medically reviewed by Drugs.com. Last updated on Aug 22, 2022.

Adipex-P® is indicated as a short-term (a few weeks) adjunct in a regimen of weight reduction based on exercise, behavioral modification and caloric restriction in the management of exogenous obesity for patients with an initial body mass index greater than or equal to 30 kg/m2, or greater than or equal to 27 kg/m2 in the presence of other risk factors (e.g., controlled hypertension, diabetes, hyperlipidemia). Below is a chart of body mass index (BMI) based on various heights and weights. BMI is calculated by taking the patient’s weight, in kilograms (kg), divided by the patient’s height, in meters (m), squared. Metric conversions are as follows: pounds ÷ 2.2 = kg; inches x 0.0254 = meters. The limited usefulness of agents of this class, including Adipex-P®, [see Clinical Pharmacology (12.1, 12.2)] should be measured against possible risk factors inherent in their use such as those described below.

Exogenous Obesity

Dosage should be individualized to obtain an adequate response with the lowest effective dose. The usual adult dose is one capsule (37.5 mg) daily as prescribed by the physician, administered before breakfast or 1 to 2 hours after breakfast for appetite control. The usual adult dose is one tablet (37.5 mg) daily as prescribed by the physician, administered before breakfast or 1 to 2 hours after breakfast. The dosage may be adjusted to the patient’s need. For some patients, half tablet (18.75 mg) daily may be adequate, while in some cases it may be desirable to give half tablets (18.75 mg) two times a day. Late evening medication should be avoided because of the possibility of resulting insomnia.

Dosage in Patients With Renal Impairment

The recommended maximum dosage of Adipex-P® is 15 mg daily for patients with severe renal impairment (eGFR 15 to 29 mL/min/1.73 m2). Avoid use of Adipex-P® in patients with eGFR less than 15 mL/min/1.73 m2 or end-stage renal disease requiring dialysis [see Use in Specific Populations (8.6) and Clinical Pharmacology (12.3)].

Dosage Forms and Strengths

Capsules: 37.5 mg phentermine hydrochloride, USP (equivalent to 30 mg phentermine base).

Tablets: 37.5 mg phentermine hydrochloride, USP (equivalent to 30 mg phentermine base).

Contraindications

History of cardiovascular disease (e.g., coronary artery disease, stroke, arrhythmias, congestive heart failure, uncontrolled hypertension)

During or within 14 days following the administration of monoamine oxidase inhibitors

Hyperthyroidism

Glaucoma

Agitated states

History of drug abuse

Pregnancy [ see Use in Specific Populations ( 8.1

Nursing [ see Use in Specific Populations ( 8.3

Known hypersensitivity, or idiosyncrasy to the sympathomimetic amines

Warnings and Precautions

Coadministration With Other Drug Products for Weight Loss

Adipex-P® is indicated only as short-term (a few weeks) monotherapy for the management of exogenous obesity. The safety and efficacy of combination therapy with Adipex-P® and any other drug products for weight loss including prescribed drugs, over-the-counter preparations, and herbal products, or serotonergic agents such as selective serotonin reuptake inhibitors (e.g., fluoxetine, sertraline, fluvoxamine, paroxetine), have not been established. Therefore, coadministration of Adipex-P® and these drug products is not recommended.

Primary Pulmonary Hypertension

Primary Pulmonary Hypertension (PPH) – a rare, frequently fatal disease of the lungs – has been reported to occur in patients receiving a combination of phentermine with fenfluramine or dexfenfluramine. The possibility of an association between PPH and the use of Adipex-P® alone cannot be ruled out; there have been rare cases of PPH in patients who reportedly have taken phentermine alone. The initial symptom of PPH is usually dyspnea. Other initial symptoms may include angina pectoris, syncope or lower extremity edema. Patients should be advised to report immediately any deterioration in exercise tolerance. Treatment should be discontinued in patients who develop new, unexplained symptoms of dyspnea, angina pectoris, syncope or lower extremity edema, and patients should be evaluated for the possible presence of pulmonary hypertension.

Valvular Heart Disease

Serious regurgitant cardiac valvular disease, primarily affecting the mitral, aortic and/or tricuspid valves, has been reported in otherwise healthy persons who had taken a combination of phentermine with fenfluramine or dexfenfluramine for weight loss. The possible role of phentermine in the etiology of these valvulopathies has not been established and their course in individuals after the drugs are stopped is not known. The possibility of an association between valvular heart disease and the use of Adipex-P® alone cannot be ruled out; there have been rare cases of valvular heart disease in patients who reportedly have taken phentermine alone.

Development of Tolerance, Discontinuation in Case of Tolerance

When tolerance to the anorectant effect develops, the recommended dose should not be exceeded in an attempt to increase the effect; rather, the drug should be discontinued.

Effect on the Ability to Engage in Potentially Hazardous Tasks

Risk of Abuse and Dependence

Adipex-P® is related chemically and pharmacologically to amphetamine (d- and dll-amphetamine) and to other related stimulant drugs that have been extensively abused. The possibility of abuse of Adipex-P® should be kept in mind when evaluating the desirability of including a drug as part of a weight reduction program. See Drug Abuse and Dependence (9) and Overdosage (10). The least amount feasible should be prescribed or dispensed at one time in order to minimize the possibility of overdosage.

Usage With Alcohol

Use in Patients With Hypertension

Use in Patients on Insulin or Oral Hypoglycemic Medications for Diabetes Mellitus

A reduction in insulin or oral hypoglycemic medications in patients with diabetes mellitus may be required. The following adverse reactions are described, or described in greater detail, in other sections:

Primary pulmonary hypertension [ see Warnings and Precautions ( 5.2

Valvular heart disease [ see Warnings and Precautions ( 5.3

Effect on the ability to engage in potentially hazardous tasks [ see Warnings and Precautions ( 5.5 Withdrawal effects following prolonged high dosage administration [ see Drug Abuse and Dependence ( 9.3

The following adverse reactions to phentermine have been identified:

Cardiovascular

Primary pulmonary hypertension and/or regurgitant cardiac valvular disease, palpitation, tachycardia, elevation of blood pressure, ischemic events.

Central Nervous System

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Overstimulation, restlessness, dizziness, insomnia, euphoria, dysphoria, tremor, headache, psychosis.

Gastrointestinal

Dryness of the mouth, unpleasant taste, diarrhea, constipation, other gastrointestinal disturbances.

Allergic

Urticaria.

Endocrine

Impotence, changes in libido.

Drug Interactions

Monoamine Oxidase Inhibitors

Alcohol

Insulin and Oral Hypoglycemic Medications

Requirements may be altered [see Warnings and Precautions (5.9)].

USE IN SPECIFIC POPULATIONS

Pregnancy

Adipex-P® is contraindicated during pregnancy because weight loss offers no potential benefit to a pregnant woman and may result in fetal harm. A minimum weight gain, and no weight loss, is currently recommended for all pregnant women, including those who are already overweight or obese, due to obligatory weight gain that occurs in maternal tissues during pregnancy. Phentermine has pharmacologic activity similar to amphetamine (d- and dll-amphetamine) [see Clinical Pharmacology (12.1)]. Animal reproduction studies have not been conducted with phentermine. If this drug is used during pregnancy, or if the patient becomes pregnant while taking this drug, the patient should be apprised of the potential hazard to a fetus.

Nursing Mothers

It is not known if Adipex-P® is excreted in human milk; however, other amphetamines are present in human milk. Because of the potential for serious adverse reactions in nursing infants, a decision should be made whether to discontinue nursing or to discontinue the drug, taking into account the importance of the drug to the mother.

Pediatric Use

Safety and effectiveness in pediatric patients have not been established. Because pediatric obesity is a chronic condition requiring long-term treatment, the use of this product, approved for short-term therapy, is not recommended.

Geriatric Use

In general, dose selection for an elderly patient should be cautious, usually starting at the low end of the dosing range, reflecting the greater frequency of decreased hepatic, renal, or cardiac function, and of concomitant disease or other drug therapy. This drug is known to be substantially excreted by the kidney, and the risk of toxic 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.

Renal Impairment

Based on the reported excretion of phentermine in urine, exposure increases can be expected in patients with renal impairment [see Clinical Pharmacology (12.3)]. Use caution when administering Adipex-P® to patients with renal impairment. In patients with severe renal impairment (eGFR 15 to 29 mL/min/1.73 m2), limit the dosage of Adipex-P® to 15 mg daily [see Dosage and Administration (2.2)]. Adipex-P® has not been studied in patients with eGFR less than 15 mL/min/1.73 m2, including end-stage renal disease requiring dialysis; avoid use in these populations.

Drug Abuse and Dependence

Controlled Substance

Phentermine is a Schedule IV controlled substance.

Abuse

Phentermine is related chemically and pharmacologically to the amphetamines. Amphetamines and other stimulant drugs have been extensively abused and the possibility of abuse of phentermine should be kept in mind when evaluating the desirability of including a drug as part of a weight reduction program.

Dependence

Abuse of amphetamines and related drugs may be associated with intense psychological dependence and severe social dysfunction. There are reports of patients who have increased the dosage of these drugs to many times that recommended. Abrupt cessation following prolonged high dosage administration results in extreme fatigue and mental depression; changes are also noted on the sleep EEG. Manifestations of chronic intoxication with anorectic drugs include severe dermatoses, marked insomnia, irritability, hyperactivity and personality changes. A severe manifestation of chronic intoxication is psychosis, often clinically indistinguishable from schizophrenia.

Overdosage

The least amount feasible should be prescribed or dispensed at one time in order to minimize the possibility of overdosage.

Acute Overdosage

Manifestations of acute overdosage include restlessness, tremor, hyperreflexia, rapid respiration, confusion, assaultiveness, hallucinations, and panic states. Fatigue and depression usually follow the central stimulation. Cardiovascular effects include tachycardia, arrhythmia, hypertension or hypotension, and circulatory collapse. Gastrointestinal symptoms include nausea, vomiting, diarrhea and abdominal cramps. Overdosage of pharmacologically similar compounds has resulted in fatal poisoning usually terminates in convulsions and coma. Management of acute phentermine hydrochloride intoxication is largely symptomatic and includes lavage and sedation with a barbiturate. Experience with hemodialysis or peritoneal dialysis is inadequate to permit recommendations in this regard. Acidification of the urine increases phentermine excretion. Intravenous phentolamine (Regitine®, CIBA) has been suggested on pharmacologic grounds for possible acute, severe hypertension, if this complicates overdosage.

Chronic Intoxication

Manifestations of chronic intoxication with anorectic drugs include severe dermatoses, marked insomnia, irritability, hyperactivity and personality changes. The most severe manifestation of chronic intoxications is psychosis, often clinically indistinguishable from schizophrenia. See Drug Abuse and Dependence (9.3). Phentermine hydrochloride, USP is a sympathomimetic amine anorectic. It has the chemical name of α,α,-Dimethylphenethylamine hydrochloride. The structural formula is as follows:

C10H15N•HCl M.W. 185.7

Phentermine hydrochloride, USP is a white, odorless, hygroscopic, crystalline powder which is soluble in water and lower alcohols, slightly soluble in chloroform and insoluble in ether. Adipex-P®, an anorectic agent for oral administration, is available as a capsule or tablet containing 37.5 mg of phentermine hydrochloride, USP (equivalent to 30 mg of phentermine base).

Mechanism of Action

Adipex-P® is a sympathomimetic amine with pharmacologic activity similar to the prototype drugs of this class used in obesity, amphetamine (d- and dll-amphetamine). Drugs of this class used in obesity are commonly known as “anorectics” or “anorexigenics.” It has not been established that the primary action of such drugs in treating obesity is one of appetite suppression since other central nervous system actions, or metabolic effects, may also be involved.

Pharmacodynamics

Typical actions of amphetamines include central nervous system stimulation and elevation of blood pressure. Tachyphylaxis and tolerance have been demonstrated with all drugs of this class in which these phenomena have been looked for.

Pharmacokinetics

Following the administration of phentermine, phentermine reaches peak concentrations (Cmax) after 3.0 to 4.4 hours.

Drug Interactions

In a single-dose study comparing the exposures after oral administration of a combination capsule of 15 mg phentermine and 92 mg topiramate to the exposures after oral administration of a 15 mg phentermine capsule or a 92 mg topiramate capsule, there is no significant topiramate exposure change in the presence of phentermine. However in the presence of topiramate, phentermine Cmax and AUC increase 13% and 42%, respectively.

Specific Populations

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Renal Impairment

Cumulative urinary excretion of phentermine under uncontrolled urinary pH conditions was 62% to 85%. Systemic exposure of phentermine may increase up to 91%, 45%, and 22% in patients with severe, moderate, and mild renal impairment, respectively [see Dosage and Administration (2.2) and Use in Specific Populations (8.6)].

Nonclinical Toxicology

Carcinogenesis, Mutagenesis, Impairment of Fertility

Studies have not been performed with phentermine to determine the potential for carcinogenesis, mutagenesis or impairment of fertility.

Clinical Studies

In relatively short-term clinical trials, adult obese subjects instructed in dietary management and treated with “anorectic” drugs lost more weight on the average than those treated with placebo and diet. The magnitude of increased weight loss of drug-treated patients over placebo-treated patients is only a fraction of a pound a week. The rate of weight loss is greatest in the first weeks of therapy for both drug and placebo subjects and tends to decrease in succeeding weeks. The possible origins of the increased weight loss due to the various drug effects are not established. The amount of weight loss associated with the use of an “anorectic” drug varies from trial to trial, and the increased weight loss appears to be related in part to variables other than the drugs prescribed, such as the physician-investigator, the population treated and the diet prescribed. Studies do not permit conclusions as to the relative importance of the drug and non-drug factors on weight loss. The natural history of obesity is measured over several years, whereas the studies cited are restricted to a few weeks’ duration; thus, the total impact of drug-induced weight loss over that of diet alone must be considered clinically limited.

How Supplied/Storage and Handling

Adipex-P® Capsules and Tablets are available for oral administration containing 37.5 mg phentermine hydrochloride, USP (equivalent to 30 mg phentermine base). Each white, oblong, scored tablet is debossed with “Adipex-P” and “9”-“9”. Tablets are packaged in bottles of 30 (NDC 57844-140-56) and 100 (NDC 57844-140-01). Each capsule has an opaque white body and an opaque bright blue cap. Each capsule is imprinted with “Adipex-P” - “37.5” on the cap and two stripes on the body using dark blue ink. Capsules are packaged in bottles of 100 (NDC 57844-019-01). Store at 20° to 25°C (68° to 77°F) [see USP Controlled Room Temperature]. Dispense in a tight, light-resistant container as defined in the USP, with a child-resistant closure (as required).

KEEP THIS AND ALL MEDICATIONS OUT OF THE REACH OF CHILDREN.

Patient Counseling Information

Advise pregnant women and nursing mothers not to use Adipex-P® [see Use in Specific Populations (8.1, 8.3)]. Patients must be informed about the risks of use of phentermine (including the risks discussed in Warnings and Precautions), about the symptoms of potential adverse reactions and when to contact a physician and/or take other action. The risks include, but are not limited to:

Development of primary pulmonary hypertension [ see Warnings and Precautions ( 5.2

Development of serious valvular heart disease [ see Warnings and Precautions ( 5.3 Effects on the ability to engage in potentially hazardous tasks [ see Warnings and Precautions ( 5.5 The risk of interactions [ see Contraindications ( 4 ), Warnings and Precautions ( 5 ) and Drug Interactions ( 7

The patients must also be informed about

the potential for developing tolerance and actions if they suspect development of tolerance [ see Warnings and Precautions ( 5.4 the risk of dependence and the potential consequences of abuse [ see Warnings and Precautions ( 5.6 ), Drug Abuse and Dependence ( 9 ), and Overdosage ( 10 Tell patients to keep Adipex-P® in a safe place to prevent theft, accidental overdose, misuse or abuse. Selling or giving away Adipex-P® may harm others and is against the law.

Brands listed are the trademarks of their respective owners.

Manufactured In Croatia By:

Pliva Hrvatska d.o.o.

Zagreb, Croatia

Manufactured For:

Teva Pharmaceuticals USA, Inc.

Parsippany, NJ 07054

Rev. AB 9/2020

Package/Label Display Panel

NDC 57844-009-01

CIV

(phentermine hydrochloride tablets USP)

Rx only

100 TABLETS

TEVA

Package/Label Display Panel

NDC 57844-140-01

CIV

(phentermine hydrochloride tablets, USP)

Rx only

100 Tablets

TEVA

Package/Label Display Panel

NDC 57844-019-01

CIV

(phentermine hydrochloride capsules, USP)

Rx only

100 Capsules

TEVA

phentermine hydrochloride tablet Product Information Product Type HUMAN PRESCRIPTION DRUG LABEL Item Code (Source) NDC:57844-009 Route of Administration ORAL DEA Schedule CIV Active Ingredient/Active Moiety Ingredient Name Basis of Strength Strength PHENTERMINE HYDROCHLORIDE (PHENTERMINE) PHENTERMINE HYDROCHLORIDE 37.5 mg Inactive Ingredients Ingredient Name Strength STARCH, CORN ANHYDROUS LACTOSE MAGNESIUM STEARATE MICROCRYSTALLINE CELLULOSE SUCROSE FD&C BLUE NO. 1 Product Characteristics Color blue (speckled) , white Score 2 pieces Shape OVAL (oblong) Size 10mm Flavor Imprint Code ADIPEX;P;9;9 Contains Packaging # Item Code Package Description 1 NDC:57844-009-01 100 TABLET in 1 BOTTLE 2 NDC:57844-009-56 30 TABLET in 1 BOTTLE Marketing Information Marketing Category Application Number or Monograph Citation Marketing Start Date Marketing End Date ANDA ANDA085128 09/30/1990 09/18/2021 Adipex-P phentermine hydrochloride capsule Product Information Product Type HUMAN PRESCRIPTION DRUG LABEL Item Code (Source) NDC:57844-019 Route of Administration ORAL DEA Schedule CIV Active Ingredient/Active Moiety Ingredient Name Basis of Strength Strength PHENTERMINE HYDROCHLORIDE (PHENTERMINE) PHENTERMINE HYDROCHLORIDE 37.5 mg Inactive Ingredients Ingredient Name Strength FERROSOFERRIC OXIDE STARCH, CORN D&C RED NO. 33 FD&C BLUE NO. 1 GELATIN, UNSPECIFIED LACTOSE MONOHYDRATE MAGNESIUM STEARATE PROPYLENE GLYCOL SHELLAC TITANIUM DIOXIDE Product Characteristics Color white, blue (bright blue) Score no score Shape CAPSULE Size 16mm Flavor Imprint Code ADIPEX;P;37;5 Contains Packaging # Item Code Package Description 1 NDC:57844-019-01 100 CAPSULE in 1 BOTTLE Marketing Information Marketing Category Application Number or Monograph Citation Marketing Start Date Marketing End Date ANDA ANDA088023 09/30/1990 Labeler - Teva Pharmaceuticals USA, Inc. (001627975)