Generic Name
Phentermine
Brand Names
Adipex-P, Lomaira
FDA approval date: July 01, 1976
Classification: Sympathomimetic Amine Anorectic
Form: Tablet, Capsule
What is Adipex-P (Phentermine)?
Phentermine hydrochloride, USP 3.
Approved To Treat
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Brand Information
Adipex-P (Phentermine Hydrochloride)
1INDICATIONS AND USAGE
ADIPEX-P
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
2DOSAGE FORMS AND STRENGTHS
Tablets: 37.5 mg phentermine hydrochloride, USP (equivalent to 30 mg phentermine base).
3CONTRAINDICATIONS
- 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
- Nursing
- Known hypersensitivity, or idiosyncrasy to the sympathomimetic amines
4ADVERSE REACTIONS
The following adverse reactions are described, or described in greater detail, in other sections:
- Primary pulmonary hypertension
- Valvular heart disease
- Effect on the ability to engage in potentially hazardous tasks
- Withdrawal effects following prolonged high dosage administration
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
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.
5OVERDOSAGE
The least amount feasible should be prescribed or dispensed at one time in order to minimize the possibility of overdosage.
5.1Acute 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
5.2Chronic 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
6DESCRIPTION
Phentermine hydrochloride, USP is a sympathomimetic amine anorectic. It has the chemical name of α,α,-Dimethylphenethylamine hydrochloride. The structural formula is as follows:

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
ADIPEX-P
7CLINICAL STUDIES
No clinical studies have been conducted with ADIPEX-P
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.
8HOW SUPPLIED/STORAGE AND HANDLING
ADIPEX-P
Each white, oblong, scored tablet is debossed with “ADIPEX-P” and “9”-“9”. Tablets are packaged in bottles of 30 (NDC 72789-175-30) .
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.
9PATIENT COUNSELING INFORMATION
Patients must be informed that ADIPEX-P
Patients must be instructed on how much ADIPEX-P
Advise pregnant women and nursing mothers not to use ADIPEX-P
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
- Development of serious valvular heart disease
- Effects on the ability to engage in potentially hazardous tasks
- The risk of an increase in blood pressure
- The risk of interactions
See also, for example,
The patients must also be informed about
- the potential for developing tolerance and actions if they suspect development of tolerance [
- the risk of dependence and the potential consequences of abuse
Tell patients to keep ADIPEX-P
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Manufactured In Croatia By:
Manufactured For:
Rev. AC 3/2024
10Package/Label PRINCIPAL DISPLAY PANEL
CIV
ADIPEX-P
37.5 mg
Rx only
