Immediate effects

The effects of fentanyl may last up to a few hours and also can:

• make you feel really good
• physical pain disappear and hence give you wind, indigestion, cramps
• make you constipated and/or diarrhea and so you feel nauseous or vomit

Long term effects 

So if you use fentanyl often for a long time you may:

• overdose (have too much fentanyl at one time. As a result the longer you use fentanyl, the more likely you are to overdose!)
• have long-term constipation
• get damaged veins from injecting a lot in the same site and so lose your appetite
• skin abscesses (sores with pus)
• tetanus- a disease caused by infection through the places on your body where you inject. Fentanyl is a powerful pain medication. It is an opioid, like morphine, codeine, oxycodone (oxys) and methadone. Fentanyl Powder for sale is most often prescribed as a slow-release patch to people with long-term, severe pain. When used in this way, it can be very effective and safe.