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Phentermine: uses, side effects & brands

Written & medically reviewed by Dr. Sanjay Anbu, MBBS · Last reviewed

Phentermine is a short-term appetite suppressant for weight loss under supervision. It belongs to the Smoking cessation & weight group. These help people stop smoking or manage weight.

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Drug type — dosing is set by your doctor

MeasureRange
Drug classSmoking cessation & weight
TypePrescription
DoseIndividual — ask your doctor or pharmacist

What it is used for

Common brand names

Common side effects

Before taking it — precautions

When to see a doctor urgently

Not a prescription — no dose shown. The right dose of phentermine depends on age, weight, kidney/liver function and the condition, so MedDroid does not show a dose here. Always get your dose from a doctor or pharmacist and the leaflet inside the pack. General educational information only.

Frequently asked questions

What is the most effective way to quit smoking?

Medication (nicotine replacement, varenicline or bupropion) plus behavioural support works far better than willpower alone.

Are weight-loss tablets a substitute for lifestyle?

No — they support, not replace, a healthier diet and activity, and are used under medical guidance.

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Sources & further reading

Reviewed by Dr. Sanjay Anbu, MBBS. MedDroid is an AI medical assistant and can make mistakes. It provides general health information, not a diagnosis or medical advice — always consult a qualified clinician. In an emergency, contact your local emergency number immediately.