If you're mpb prone and use ANY kind of gear (yes, even gear like anavar) you're risking an acceleration of hair loss due to the androgenic properties of ALL aas.
Shedding might be more severe while on cycle and seem to slow down when you're off but the DHT damage to the hair follicle is done. Your hair will most likely grow back thinner and weaker afterward
3-5mg of finasteride ed has been recommended to combat androgenic sides when on heavier test and / or DHT based cycles (primo, winny, etc). Hair loss issues, severe acne issues, as well as unwanted body hair while on theoretically SHOULD all be affected positively by inhibiting excess androgens.
The trade off here is that the inhibition of DHT would also hinder your gains to some degree as well and could cause other sexual sides (loss of libido, erectile disfunction).
I used to HATE the idea of losing MORE hair when on a cycle than I already was naturally. But with new advancements in hair restoration (hair cloning and transplanting) I've gained some comfort in knowing that I could get some permanent work done to remedy the thinning and hairline issue. I've just accepted it, I'm actually more concerned about unwanted body hair than I am about losing hair these days.
Of course it will cost some nice $ but hey, a few years of meds and topicals (not to mention time and sides) would cost you about the same if not more. And this would just SLOW down the rate at which your hair is lost... if you're prone, eventually it's gonna go.