Kidney problems: If you have poor kidney function you may need lower doses of Viagra Sildenafil. However, all medications come with risks. Other medications that should be avoided while using Viagra include oral antifungal or antibiotic medications, particularly ketoconazole, itraconazole, clarithromycin, erythromycin, telithromycin and others. Other medications used to treat high blood pressure and heart disease, such as alpha blockers, can interact with Viagra and cause issues such as fainting. You may opt-out of email communications at any time by clicking on the unsubscribe link in the e-mail. · As the second most popular ED drug after Cialis, Viagra received a lot of attention when its first generic version, manufactured by Teva Pharmaceuticals, became available back in December Teva’s version of sildenafil debuted at an average cash price of around $30 per pill, roughly 50% cheaper than brand-name Viagra. Next steps Viagra (sildenafil) is a brand-name oral tablet prescribed for erectile dysfunction. The cost of the drug with and without insurance can depend on several factors, such as . F W RICHARDS JR INC. $ N Main St. Chase City, VA mi. Closed. () Get Coupon.