Report Your Side Effects

Regulatory Agencies

Anyone suffering from persistent finasteride side effects is encouraged to report them to the appropriate agency.


Merck & Co., Inc. is the manufacturer of Propecia and Proscar.  To report adverse events to Merck, call the Merck National Service Center at (800)444-2080.

In addition to agencies like the U.S. Food and Drug Administration and World Health Organization, PFS patients are encouraged to report their persistent side effects to, a global, independent pharmacovigilance organization whose database is used by patients, doctors and pharmacists to research prescription drugs and their side effects, ideally to identify problems early on in the life of a drug.