Guys I've use Propecia (Proscar) for the past 16 years - every day without exception - 1.25 mgs per day
I started using it when the drug was in phase 3 clinical testing. I was a test subject in 1995. I was 25 at the time.
I can only tell you about my own experiences. I have never had any sort of side effect. I'll also tell you this, it is the only reason at 40 years old, I still have a rockstar head of beautiful hair.
You see, every male on both sides of my family was totalyl bald by the age of 35. I'm not talking 'receeding' I mean Mr. Clean bald!
In 1994, I could tell my hair had started to thin around the hairline. Of course, this was at a time when I was still competing as a national-level body builder and I was running 700 mgs of test a week.
I was also working on my PhD at the time and I knew one of the pharmacy professor that was helping with the clinical testing of Propecia for MPB. He got me signed up for the clinical trials.
The trial lasted 6 months. Guess what, my hair stopped falling out. It was a huge relief to me. Even better, once I stopped running the 700 mgs of test, some of my hair actually started to regrow! That continued through the first year of using the drug. Today, my hairline looks like it did when I was 21 years old.
I would recommend Propecia to anyone who is concerned about losing their hair. As I mentioned, it is the only reason I'm not bald like the rest of my brothers, uncles, and father.
Regards.