You are not ejaculating sperms? How do you know that? Did you do a semen analysis? Or do you mean that you are not ejaculating at all. That's called semen. These drugs at times do cause these side effects. There's nothing to worry about. You just need to go back to the doctor who gave you these medicine and tell him about the problem. He'll help you out. Change the medications or tell you some remedies to solve ya problem.