By reducing DHT so drastically, effects can occur in the genital tissues and in the brain.

By reducing DHT so drastically, effects can occur in the genital tissues and in the brain. This can lead to numbness in the penis and erectile and libido disorders, which are related to what happens in the brain. These symptoms are very rare, but once you have them, it’s forever.

—Baldness Medication Can Cause Permanent Erection Problems (English translation): De Volkskrant, February 15, 2019