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Phentermine: uses, side effects & brands
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.
Drug type — dosing is set by your doctor
| Measure | Range |
|---|---|
| Drug class | Smoking cessation & weight |
| Type | Prescription |
| Dose | Individual — ask your doctor or pharmacist |
What it is used for
- Short-term weight loss in obesity
- Used with diet, exercise and behaviour change
- Reducing appetite for a limited period under supervision
Common brand names
- India: (restricted)
- Worldwide: Adipex-P, Lomaira
Common side effects
- Dry mouth
- Trouble sleeping
- Fast heartbeat
- Constipation
Before taking it — precautions
- Not for people with heart disease, uncontrolled high blood pressure, hyperthyroidism or glaucoma
- Never combine with MAOI antidepressants or other weight-loss drugs
- Controlled medicine with misuse risk; not for pregnancy
When to see a doctor urgently
- Chest pain, breathlessness or ankle swelling (urgent)
- Fainting or racing heartbeat (urgent)
- Severe agitation or mood change
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
Why is it only for short-term use?
Its effect fades over time and longer use raises the risk of side effects and dependence.
Will I regain weight when I stop?
Often, unless diet and activity changes continue. The medicine is meant to support lifestyle change.
Is it a stimulant?
Yes, it is related to amphetamine, which is why it can cause sleeplessness and a fast heartbeat.
Explore more
Sources & further reading
- World Health Organization (WHO)
- MedlinePlus — U.S. National Library of Medicine
- Ministry of Health & Family Welfare, India
- Indian Council of Medical Research (ICMR)
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.