But now that the “little blue pill” is more accessible, some men might use it recreationally — meaning without a prescription. Patients should always ask their doctors for medical advice about adverse events. The danger comes from taking it with other drugs or getting it from someone without a medical license. 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. The bottom line: It’s safe to take as prescribed. For example, if someone takes sildenafil citrate after a night of drinking, they can experience migraines and increased facial flushing.Viagra Coupon/Offer from Manufacturer – Download and print your free Viagra® savings card/coupon. The Card is limited to 50% savings off the amount of your co-pay . () DISCOUNT ONLY – NOT INSURANCE Administered by Medical Security Card Company, LLC of Tucson, AZ No results found for Sildenafil at your location. .