What exactly do you mean by antiandrogens? Is it a topical drug or something to you take internally? I would give the Nizoral shampoo (used as a facial cleanser) first, before taking another drug or getting another prescription. Seriously, after 2 days of using it, I am totally clear of the flakes! If you really do have seborrheic dermatitis, it is fungal and nothing else will get rid of it other than an antifungal. Believe me, I tried almost everything before I tried the Nizoral!
I think you can continue to use the tazorac, but if I were you, I would lay off of it for a couple of days while you are using the Nizoral, just to make sure you don't "dilute" the antifungal affect. Once the fungal infection and the flakes are gone, I see no reason why the tazorac wouldn't work just as well (if not better) than it did before.