Doctor, I Have Noticed Reduced Performance In The Bed. My

Doctor, I have noticed reduced performance in the bed. My age is 47. I am married & having two kids. Everything was normal till last two weeks, suddenly when this was noticed. I am taking following medicines like atan 50, ecospirin, neurobean, zincovit. I do regular exercise in gym. I am a vegiterian, do not smoke or drink. What could be probable cause of my problem? Is this due to side effect of medicine I am taking? I do not have diabetes.