Don’t ignore stress, anxiety or other mental health concerns. You should also ask what results should expect from using the medication. Stop taking VIAGRA and call your healthcare provider right away if you have any sudden vision loss sudden hearing decrease or hearing loss. Take sildenafil exactly as directed. Depending on your particular health concerns, you might go directly to a specialist — such as a doctor who specializes in male genital problems urologist or a doctor who specializes in the hormonal systems endocrinologist. Here are some steps that might help: If you smoke, quit.Who may not be able to take sildenafil. Sildenafil is not suitable for some people. To make sure it’s safe for you, speak to your doctor or pharmacist before taking sildenafil if you: have ever had an allergic reaction to sildenafil or any other medicine. have recently had a stroke, heart attack or a heart problem – your doctor should. AdA Doctor Will Answer in Minutes! Questions Answered Every 9 es: 1-on-1 Doctor Consult, Nurse Advice, Symptom Check, Treatment Options. If you have these symptoms, stop taking VIAGRA and contact a doctor right away Before you take VIAGRA, tell your healthcare provider if you: • have or have had heart .