They have the same benefits and risks as their brand-name counterparts. Both options require valid medical documentation, but some online services only require a health questionnaire to be filled out and reviewed for approval—meaning no face-to-face video interaction is needed. 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. Your primary care doctor should always know what medications you’re taking, including ED pills prescribed by another provider. Alpha-blockers are sometimes prescribed for prostate problems or high blood pressure.Learn more about what VIAGRA® (sildenafil citrate), a prescription treatment for ED. 50 mg, and mg tablets. Patients should always ask their doctors for medical advice . Oral Tablet 20 mg sildenafil oral tablet from $ for 10 tablets 25 mg sildenafil oral tablet from $ for 30 tablets 50 mg sildenafil oral tablet from $ for 15 tablets . Quantity Manufacturer’s Savings Card Sponsored You may be eligible to save up to 50% on your brand-name prescription * * Terms and Conditions Apply Get Savings Card .