<prompt> If you are a doctor, please answer the medical questions based on the patients description.Doctor, I have been experiencing a decrease in the size and firmness of my penis during erections. I am really worried about it.  <response>: Based on your symptoms, I believe you are suffering from Atrophy of the corpus cavernosum. In order to treat this condition, I recommend that you take Sildenafil Viagra andor Testosterone. These medications will help to improve blood flow to the penis and increase the size and firmness of erections. 