How can I best manage other health conditions with my erectile dysfunction? Are there any restrictions that I need to follow? Do your erectile problems occur only sometimes, often or all of the time? If medication is prescribed, is there a generic alternative? Create a List of Your Concerns You need to have a plan when consulting your doctor for a specific case. Medicines that block an enzyme called CYP3A4.By asking questions about ED, you can help your doctor get the information he or she needs to find out if treatment is right for you • What could be causing my ED symptoms? . The four main medicines taken by mouth for erectile dysfunction are: Avanafil (Stendra). Sildenafil (Viagra). Tadalafil (Cialis). Vardenafil. These medicines are called PDE5 . If you sense your doctor is uncomfortable talking about ED, ask for a referral to a urologist—a specialist trained to treat conditions related to the urinary tract and male .