Nisim shampoo

[mlao]

The 48 weeks applies to the length of their clinical study

here is a quote from their website;

How long can I use ROGAINE®?
Our clinical studies did not go beyond 48 weeks. However, there is no limit on how long you may use ROGAINE®. Continued use is necessary to increase and keep your hair regrowth, or hair loss will begin again.

I hope this helps.