Tell your doctor or pharmacist if you are taking nitrates medications for chest pain such as isosorbide dinitrate Isordil , isosorbide mononitrate Monoket , and nitroglycerin Nitromist, Nitro-Dur, Nitrostat. If you are taking sildenafil to treat PAH, you will probably take sildenafil three times a day with or without food. To provide you with the most relevant and helpful information, and understand which information is beneficial, we may combine your email and site usage information with other information we have about you. However the dose is usually not more than 40 mg 3 times a day. On the basis of application, the sildenafil market is segmented into peripheral vasodilator and erectile dysfunction. Oral medicines for ED usually work well and cause few side effects.Compare prices and print coupons for Sildenafil (Generic Revatio and Viagra) and other drugs at CVS, Walgreens, and other pharmacies. Prices start at $ Coupon. Simply bring the coupon below to the pharmacy, and save on Sildenafil at CVS, Walgreens, Walmart, Safeway, Albertsons, Rite Aid, Target, Kroger, and many other drug stores! These coupons are free and can be used to save up to 80% on all medications. Use our Medication Pricing tool to find the discount price of your prescription at your. 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 hypertension (PAH; high blood pressure in the vessels carrying blood to the lungs, causing shortness of breath, dizziness, and tiredness).