Do narcotics make it harder to build muscles if they're taken for long periods of time?

Narcotics and Muscle. Narcotic is a legal term, not a medical term. The medications most often thought of when narcotics are mentioned are opiods such as morphine, oxycodone, and methadone. Used correctly, these medications are not assocated with an inability to build muscle; actually if pain is preventing activity you may be able to maintain muscle massby using an opioid to keep you active despite persistent pain.
Perhaps. There is more and more information available indicating that long term opiate / narcotic use is harmful in many ways.