· For oral dosage form (tablets): Adults up to 65 years of age—50 milligrams (mg) as a single dose no more than once a day, 1 hour before sexual intercourse. .Sildenafil comes as a tablet and suspension liquid to take by mouth. Store mixed oral liquid in the refrigerator. Remove the cap by pushing it down and twisting it counter-clockwise. Sildenafil usually should not be taken more than once every 24 hours. Your doctor may need to change the doses of your medications or monitor you carefully for side effects. Be sure to let your doctor and pharmacist know that you are taking these medications before you start taking sildenafil.Q&A Drug Images What is Viagra? If you have erectile dysfunction (ED), your doctor may recommend that you take Viagra. It’s a prescription drug that’s used in . Sildenafil (Viagra) is a phosphodiesterase-5 (PDE-5) inhibitor. PDE-5 is a protein in your body that breaks down the molecules that normally cause an erection. . Sildenafil (Liqrev, Revatio) is used to improve the ability to exercise in adults (Liqrev, Revatio) and children 1 year of age and older (Revatio) with pulmonary arterial .Other uses for this medicine This medication is sometimes prescribed for other uses; ask your doctor or pharmacist for more information. If you prefer, you may contact the U. Read and follow these instructions carefully before you start using sildenafil and each time you get a refill of your medicine. If you are taking sildenafil for PAH, take the missed dose as soon as you remember it. From Mayo Clinic to your inbox Sign up for free and stay up to date on research advancements, health tips, current health topics, and expertise on managing health. Use the oral syringe provided with your medication to measure and take your dose. Do not stop taking sildenafil without talking to your doctor.
