"Naproxen is available on prescription as tablets or as a liquid that you drink. You can buy it without a prescription from a pharmacy for period pain.
Brands include Feminax Ultra, Period Pain Reliever and Boots Period Pain Relief"
My doctor gave me Naproxen, if my memory serves me right, for back pain. He wouldn't give me any more, he said they could have nasty side effects if taken long term.