If you're prone to MPB then definitely take finasteride with your cycle. It won't totally stop her loss but will help maintain what you have. I have been on Finasteride for 2 years and still get some shedding when on a cycle. There are some compounds that you shouldn't use with finasteride like Deca. Finasteride with Deca is a no no. It will make your hair loss worse. Check out the link below. There's some good info about how finasteride reacts with different compounds. There is also another drug you can take for hair loss which is stronger call Dutasteride. I take this twice a week along with 1mg of finasteride a day and i still have my hair
http://www.hairlossfromsteroids.com/Specific-Steroids-and-Hair-Loss.html

Finasteride is a 5α-Reductase enzyme inhibitor, not an chemical that destroys DHT. So any compound that produces metabolites via the 5α-Reductase enzyme will be hindered by finasteride. Test is 5α reduced to
dihydrotestosterone (DHT) so finasteride will hinder that process. Nandrolone is 5α reduced to dihydronandrolone (DHN) which is weaker than DHT but still not great for your hair either - some say it's even benign. Finasteride will stop that process. There is a debate over stopping nandrolone from converting to DHN and leaving more nandrolone in the blood that could potentially attack your hair, but this is an ongoing debate with no conclusion or studies to back it up. There doesn't seem to be research on finasteride with Tren. Any compound like Mast that is already a DHT derivative that does not get 5α reduced will not be affected by finasteride.

I started finasteride about three weeks ago and am currently on test/mast/npp cycle and I swear I see new hairs popping up. I'm also using Nizoral shampoo 2x a week and Nioxin #1 shampoo and conditioner every day.