Can you please tell me what the latest information is on Propecia beyond the 5 year mark ? There was a hypothesis that a plateau might be reached at the 5-6 year mark as hairs entered a new growth phase and the hair counts might improve. Is this the case?
The formal Propecia study only goes out 5 years, and I can’t seem to find any official published data beyond that (even from Merck, the manufacturer). The suggestion from what I have seen in the 5 year study is that the number of hairs will probably drop off slowly, possibly more slowly than it would without the medication. It is also the experience of many that this is not just a ‘number of hairs’ game, but it is also one which reflects hair quality. The thickness of the hair shaft in those treated with Propecia gets better and will probably stay better while the drug is maintained. But your question is asking for the difference beyond 5 years, and I am afraid that a solid answer would only be speculation on my part.