Fentanyl is a strong opioid painkiller. It's used to treat severe pain, for example during or after an operation or a serious injury, or pain from cancer.

It is also used for other types of pain that you've had for a long time when weaker painkillers have stopped working.

Fentanyl is available only on prescription. It comes as:

• patches to be put on your skin

• lozenges and tablets that dissolve in the mouth

• nasal spray

• injections (usually only given in hospital)

Fentanyl patches are used for long-lasting pain. Your doctor may also prescribe other types of fentanyl if you need extra pain relief while your regular painkiller wears off.

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• The most common side effects of fentanyl are constipation, and feeling sick and sleepy.

• It is possible to become addicted to fentanyl, but your doctor will explain how to reduce the risks of becoming addicted.

• If you need to take fentanyl for more than a few weeks, your treatment plan may include details of how and when to stop taking this medicine.

• It's best not to drink alcohol when you first start taking (or using) fentanyl. You're more likely to get side effects such as feeling sleepy or drowsy.

• Tell a doctor or nurse about your fentanyl patch if you're having any treatment or tests. Also, remind your pharmacist about your patch when you collect prescriptions or buy other medicines.

Benzodiazepines. painkiller, anxiety.

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