Approximately 0.8% of men for whom finasteride has been prescribed describe the early onset…of psychologically devastating side effects, with the endpoint of suicide in a small number of cases.

Adverse effects from finasteride are said to be rare, however some men experience sexual dysfunction, depression, breast enlargement and/or a host of other symptoms, reminiscent of chronic fatigue syndrome and intracellular hypothyroidism, which may persist long after stopping the medication. Approximately 0.8% of men for whom finasteride has been prescribed describe the early onset (within the first few months) of a constellation of psychologically devastating side effects, with the endpoint of suicide in a small number of cases. This has been dubbed “the post-finasteride syndrome”.

—Finasteride Causes Depression: The Post-Finasteride Syndrome: February, 2023