Sir I Had Infection After I Had S** But My

Sir I had infection After I had s** but my friend gave a course of medicine to me after which I had smth like period for one day but after that I was ok for one day n after dat again the urge to urinate started very badly so I took ceftas_200 n alkacip for five days it was well but after two to three days again it happened so I started taking it again now I noticed wen I take medicine I'm ok else pblm affect me what is happening to me n what should I do