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Fentanyl: uses, side effects & brands
Fentanyl is a very strong opioid used as patches or injections for severe pain. It belongs to the Opioid painkiller (strong) group. Opioids relieve moderate-to-severe pain but can cause dependence and slowed breathing, so they are used carefully and usually short-term.
Drug type — dosing is set by your doctor
| Measure | Range |
|---|---|
| Drug class | Opioid painkiller (strong) |
| Type | Prescription |
| Dose | Individual — ask your doctor or pharmacist |
What it is used for
- Severe long-term pain in people already used to opioids (patches)
- Pain relief during and after surgery (injection)
- Breakthrough cancer pain (special fast-acting forms)
Common brand names
- India: Durogesic, Fent
- Worldwide: Duragesic, Actiq
Common side effects
- Drowsiness
- Constipation
- Nausea
- Skin irritation under the patch
Before taking it — precautions
- Never combine with alcohol, sleeping pills or benzodiazepines; breathing can slow dangerously
- Tell the doctor about breathing problems, liver or kidney disease, or past addiction
- Patches are only for people already on opioids; heat on the patch (hot baths, heating pads, fever) can release a dangerous dose
When to see a doctor urgently
- Slow breathing, extreme drowsiness or unresponsiveness (urgent)
- A child touching or swallowing a patch (urgent)
- Confusion or pinpoint pupils (urgent)
Frequently asked questions
How do I dispose of a used fentanyl patch?
Fold it sticky sides together and dispose of it safely as your pharmacist advises. Used patches still contain enough medicine to harm a child.
Why must I avoid heat on the patch?
Heat makes the skin absorb fentanyl faster, which can cause an overdose.
Why is fentanyl so dangerous?
It is far stronger than morphine, so even small extra amounts can stop breathing. Keep naloxone available if advised.
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.