I had to delve deeper into the topic, and this article on the website
https://unitedrecoveryproject.com/rehab ... ithdrawal/ became a real source of knowledge. The phases of fentanyl withdrawal are described in great detail - from the first 12 hours to several weeks. It was striking how much both the body and the psyche suffer: insomnia, severe muscle pain, panic attacks, irritability. The article emphasizes that an independent attempt to quit can even be dangerous. Professional help, medication support, careful observation are not luxuries, but a necessity, especially when it comes to such a strong opioid as fentanyl. I highly recommend reading it to be prepared.