Hm...man problems is not good, but I think that using stimulants is not a very good idea. I think that such problems require qualified treatment. You can go through a doctor's examination and he will prescribe treatment for you. In general, it all depends on the cause of the problem. For example, if it came with age, then the treatment will be specific. My friend passed a survey in the Hormone Replacement Therapy Clinic. The doctor said that hormonal therapy would help with his problem. You can read more information
on this website about this. It can be useful for you.