It’s important to follow your doctor’s instructions.
Doses vary from person to person. Your dose will depend on how bad your pain is, how you’ve responded to other painkillers and if you get any side effects from fentanyl.
Fentanyl tablets, lozenges, nasal spray and injections are fast-acting. They’re used for pain that is expected to last for a short time.
Fentanyl patches are slow-release. This means fentanyl is gradually released through the skin into your body.