In some patients, the use of VIAGRA with alpha-blockers can lead to a drop in blood pressure or to fainting medicines called HIV protease inhibitors, such as ritonavir Norvir , indinavir sulfate Crixivan , saquinavir Fortovase or Invirase , or atazanavir sulfate Reyataz some types of oral antifungal medicines, such as ketoconazole Nizoral and itraconazole Sporanox some types of antibiotics, such as clarithromycin Biaxin , telithromycin Ketek , or erythromycin other medicines that treat high blood pressure other medicines or treatments for ED VIAGRA contains sildenafil, which is the same medicine found in another drug called REVATIO. Cialis Daily tadalafil : This low-dose Cialis works by increasing blood flow to the penis over time, making it easier to have an erection when aroused. Tell your doctor if sildenafil is not working well or if you are experiencing side effects. Use the oral syringe provided with your medication to measure and take your dose. While each PDE5 inhibitor differs slightly, they’re very similar in treating erectile dysfunction. This is important for your overall health and safety, as certain medications can negatively interact with each other or cause existing conditions to worsen.Price and coupons for 1 Tablet of Viagra mg found near We’re sorry we couldn’t find any coupons in your area. Please try another search or try again later. Have questions? Savings are. AdWe Offer an Extensive Selection Of Everything Else Store At Amazon. Order Today! Enjoy Great Deals and Discounts On an Array Of Products From Various es: Pet Supplies, Pharmacy, Medical Care, Anxiety, Hypothyroidism and more.  · Sildenafil is used to treat men who have erectile dysfunction (also called sexual impotence). Sildenafil belongs to a group of medicines called phosphodiesterase 5 (PDE5) inhibitors. These medicines prevent an enzyme called phosphodiesterase type-5 from working too quickly. The penis is one of the areas where this enzyme works.