If the half-life of Propecia is only 8 hours (or whatever it is…less than 24 hours anyway) I’m just wondering shouldn’t it be taken at least 2-3 times a day? I know it wouldn’t be viable given the cost, but technically speaking, is this a reasonable assumption?
Also you speculated a while back that it may be better to take Propecia in the mornings as testosterone levels are highest at that point. Even though it was pure speculation, I was wondering: are testosterone levels highest in the morning or when you wake up (which may not necessarily be in the morning).
Your assumptions are reasonable. However, Merck (the makers of Propecia) has determined through extensive human clinical testing that once a day dosing of Propecia (finasteride 1mg) had the best effect on male pattern hair loss.
Male testosterone levels are generally higher in the morning if your body is in a regular circadian rhythm following a normal wake/sleep cycle. If you are a night-shift worker or sleep at different times, your testosterone levels may peak at different times.