What medications from a disorder of an erection are there?

Alexander: Hello. Please tell me what could be wrong. The desire for sex rarely occurs, erections are weak. When having sex, in the process, you may notice an erection. It happens and is normal, but rare. What can you recommend drugs? Thanks in advance.

The answer of the doctor-doctor: Hello, Alexander! To begin with I advise to establish the cause of erection disorders, because in each case the treatment is different. Perform ultrasound vessels of the penis with Doppler, explore total testosterone, LH, SHBG,TSH, prolactin, blood sugar and consult to the sexologist (andrologist, urologist). I wish you health.