What is the most effective acne medication?

I am almost hopeless with these stubborn acne and cover my face. I’m tired of trying so many treatments and even visit some famous dermatologists, but still this zit is not go away from my face. And I’m not a teenager anymore, I am 30 years old, and I am married! Do you think that this is normal for my age now? Somebody please tell me about the best acne treatments. I’m in the edge of desperation.