I've posted this before on PPRuNe...I found the following much more effective as a painkiller for migraine. Once I started taking this combination I found that I had no pain, just a felt a bit weird for a couple of hours. Got to take them as soon as you notice the warning signs though. (Assuming you have no bad reactions to either of the substances!)
1000mg Paracetomol + 600mg Ibuprofen (taken together).