I did take Propecia for approx. a year and a half I believe. I fit into the side effect category that Dave pointed out can happen with any drug.
I started to feel very lethargic....it started out very minimal and then became very obvious that I was extremely tired all the time and just generally felt weak. My doctor ran me for several things and my testosterone level came back pretty low. I ended up having injections of testosterone. I never put two and two together and the doctor didn't either until I told him I had been taking Propecia (it was prescribed by a different doctor). He said that had to be it because I was too young at the time to have those kinds of issues with my testosterone level. I stopped Propecia and my level went and stayed much higher without any further injections.
Just to be clear, this is not all that common of a side effect....at least not at the time (I started taking it way back when Finasteride was first said to regain hair and became available to the general public for this use). I believe back then it was only around 2% that were experiencing low testosterone levels.
It did grow a decent amount of peach fuzz type hair on me, but it was an odd texture compared to the rest of my hair and it never grew very long.
I have to say just from my experiences with Propecia, hair transplants and concealers that if I was to do it all over again I would never personally ingest anything for hairloss, but only because of my experience of course. I would personally do a topical Rogaine treatment daily and use a really good concealer to see if you can regrow some hair and at the same time prolong the switch to a piece. I bought myself a few extra years with concealers and it worked well until I lost too much and the concealers didn't look natural anymore.
If it gets to the point where you know you are going to switch, but are nervous about making the leap to a piece, there are ways to do it without making a total commitment. You can have a piece made approx. 1/2" wider on the sides and 1/2" longer in the back and have clips sewn on. This is an "old school" method of attachment so to speak, BUT it allows you to clip the piece into your own hair without adhesive (except in the very front)....get it cut in and make sure you like the look before you commit and shave your head. Then all you do is trim the excess 1/2" off and you are good to go.
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