These include itraconazole Sporanox, Tolsura , ketoconazole Extina, Ketozole, others and ritonavir Norvir. From there, you can explain your situation using the list that you created. Do not take more or less of it or take it more often than prescribed by your doctor. In contrast, there are certain medications and ED treatments prescribed online such as BlueChew , which can help you overcome the problem efficiently and quickly. Oral medicines for ED usually work well and cause few side effects. Continue to take sildenafil even if you feel well. Also tell your doctor if you have or have ever had pulmonary veno-occlusive disease PVOD; blockage of veins in the lungs ; a stomach ulcer; heart, kidney, or liver disease; a heart attack; heart failure; angina chest pain ; an irregular heartbeat; a stroke; chest pain; high or low blood pressure; high cholesterol; a bleeding disorder; blood circulation problems; blood cell problems such as sickle cell anemia a disease of the red blood cells , multiple myeloma cancer of the plasma cells , or leukemia cancer of the white blood cells ; conditions affecting the shape of the penis e.Sildenafil (Viagra) is used to treat erectile dysfunction (impotence; inability to get or keep an erection) in men. Sildenafil (Liqrev, Revatio) is used to improve the ability to exercise in Missing: primary doctor. FAQs What to consider Cost Overdose Ask your doctor Q&A Drug Images What is Viagra? If you have erectile dysfunction (ED), your doctor may recommend that . Your doctor or other health care professional can recommend one for you based on these factors, other health conditions you have and any other medicines you .