What Is Phentermine Used For? FDA-Approved Uses

The FDA label says: “Phentermine hydrochloride capsules are 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 ≥ 30 kg/m 2, or ≥ 27 kg/m 2in the presence of other risk factors (e.g., controlled hypertension, diabetes, hyperlipidemia).”

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Phentermine Hydrochloride, capsule

Indications and Usage, quoted from the label by Calvin Scott & Co., Inc. (ANDA205019). Cross-references to other label sections are left out.

Phentermine hydrochloride capsules are 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 ≥ 30 kg/m 2, or ≥ 27 kg/m 2in 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.
BODY MASS INDEX (BMI), kg/m 2
The limited usefulness of agents of this class, including phentermine, [se e CLINICAL PHARMACOLOGY] should be measured against possible risk factors inherent in their use such as those described below.

Source: DailyMed label, set id d24aaa53-9c78-4c1b-9495-c785a9cf2b26, version 3, effective May 21, 2026. NDC 17224-851, one of 66 listings for this product.

Phentermine Hydrochloride, tablet

Indications and Usage, quoted from the label by Calvin Scott & Co., Inc. (ANDA203495). Cross-references to other label sections are left out.

LOMAIRA™ tablets are 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 in patients with an initial body mass index greater than or equal to 30 kg/m 2, or greater than or equal to 27 kg/m 2in 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.
BODY MASS INDEX (BMI), kg/m 2
The limited usefulness of agents of this class, including phentermine (see Clinical Pharmacology ), should be measured against possible risk factors inherent in their use such as those described below.

Source: DailyMed label, set id 0718f0f3-77f2-45d7-be12-1ed718c8b806, version 3, effective May 21, 2026. NDC 17224-840, one of 56 listings for this product.

Questions

What is phentermine used for?

The FDA label says: “Phentermine hydrochloride capsules are 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 ≥ 30 kg/m 2, or ≥ 27 kg/m 2in the presence of other risk factors (e.g., controlled hypertension, diabetes, hyperlipidemia).”

What drug class is phentermine?

FDA lists phentermine in the Sympathomimetic Amine Anorectic established pharmacologic class.

Does this page cover off-label uses or dosing?

No. This page shows only the Indications and Usage section of the FDA label. Ask a pharmacist or prescriber about dosing.