My skin can get awful at times, but I've never been prescribed anything, mainly because it won't do much!
Avoiding moiturisers and make-up that clog eveything up helps, as does washing in just water. Sounds daft, but making sure you dry your skin thoroughly also helps me loads.
The one thing that really did help more then anything was improved diet. I juat can't diet, not effectively or following a strict plan anyway. I enjoy my food too much