hello. ive been taking penicillin for strep throat, but I also have been taken aleve for my back. ive been going to the chiropractor for a few weeks now he is straightening out my back so needless to say I have pain in my back so that's why ive been taking aleve. but ive been feeling sick to my stomach and cramps. should I still take both or if not I don't know which one to stop taking i read about them both and they both could be causing this. ive been taking aleve longer then I have the penicillin and the syptoms started when I took the antibiotic.