Medicines affecting sperm

Testosterone and anabolic steroids are the most important, but some chemotherapy agents, sulfasalazine, certain antifungals and long-term opioids also affect sperm. Most effects reverse over months after stopping, under medical guidance.

Also known as: drugs and sperm count, medication and male fertility

Last reviewed: September 9, 2026. Written by the Antega Editorial Team. General information only — always follow the advice of your own clinic, doctor or pharmacist.