Hi doctor. how are you. I have asked you questions before and you have replied to my answers, and I want to thank you for that. Keep up the good job.
Correct me if I am wrong. In this article that someone posted to you it states that finasteride lowers T levels(testosterone) as well.
here is the link: http://baldingblog.com/2010/09/13/mercks-fda-submitted-propecia-documents/
Here is my question. I thought finasteride lowers DHT and increases testosterone by about 15% or something. Does finasteride lower testosterone as well? And how would this affect building muscle and body building?
please clarify this for me doc.

Propecia slightly raises testosterone initially but eventually your hormone levels should return to normal. The reports in the literature seems to go both ways. Some reports indicate a rise in Testosterone while others show a decrease. Unless you are a biochemist/pharmacist doing research, I do not think these are significant issues. Propecia will not make you into Arnold Schwarzenegger or Urkle.


You are trying to make sense and correlate biochemical hormonal variation with clinical issues that may not be related. If you are asking your question for pure scientific purposes, I would take a course a biochemistry for a better understanding or speak to a research pharmacist/biochemist. My desire to revisit my biochemistry days and contemplate professorial issues are not really there.
I do occasionally run into men who are heavily into weight lifting and body building and use anabolic steroids. One of them was convinced that Propecia made them weaker and gave them a disadvantage. A few have insisted taking Propecia to counteract the hair loss from their anabolic steroid use and didn’t report any changes in strength or muscle mass. But these are all anecdotal (non-scientific) and subjective stories. In my humble opinion, Propecia has negligible impact on testosterone and strength. Even the professional world of sports have taken the position that it is not a performance enhancing drug.