Re: Shedding from week 1
One week is a bit early to see increased shedding secondary to initiating treatment. Although the rogaine package insert says it can show by two weeks, 3-6 is more typical. It may be that you had an extraordinary number of loss-phase hairs when you started finasteride. One major cause of this is stopping treatment a few weeks/months before. OTOH, it may just be coincidental.
Peter H. Proctor, PhD,MD