I was having hypertension and one the medicine Stamlo T for 3 years. But from some time my pulse rate was very high and my doctor prescribed Nebistar 5 and Temsan 40. But after taking both these medicines my pulse rate was normal but B.P started lowering very much. Now I have been prescribed Nebistar 2.5 mg only once and am taking for ten days and feeling very relaxed. Should I continue this medicine as I have heard that it has serious side effects like impotence. I am only 37 yrs. old.