all relative to how sensitive your follicles are to androgens, primarily DHT.
Iv'e been on 600mg test for close to 10 months straight, and haven't lost a single hair. Iv'e even taken dianabol at 50MG for 6 weeks straight and didn't even shed, had mild androgen activity, and the odd itch in my scalp but nothing alarming. Again, this is apparently notorious for eating up hair due to how androgenic the compound is.
A buddy of mine started diffusing all over from 500mg testosterone.
To many variables. Put it this way, if your male pattern baldness is not agressive, and prior to finasteride it receeded very slow then chances are if medication has maintained then you wont loose any additional hair. On the opposite side, if you shed, itch and are still actively receeding on finasteride, then I wouldnt touch steroids with a ten foot poll.