What special precautions should I follow? Because of the risks of this medication, people taking alpha-blockers, antifungals like itraconazole or ketoconazole , antibiotics like erythromycin , over-the-counter nitrate and nitrate supplements like amyl nitrate or nitroglycerin or recreational drugs like poppers should tell a healthcare professional before they take Viagra. The following information includes only the average doses of this medicine. 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. Use only the brand of this medicine that your doctor prescribed. Children—Use is not recommended.AdLearn the truth about men’s sex pills and how to achieve optimum results naturally. Male UltraCore is the #1 Rated premium sex pill for maximum enhancing ry Leaders · Watch Video · Fully Equipped · Custom Formulation. 1 day ago · Hims is a telehealth company that provides both prescription and over-the-counter generic and brand-name medications. The brand focuses mainly on five medications, including Viagra, that have.  · Viagra is used as needed, meaning you only take a dose prior to sexual activity. Cialis can be prescribed for use as needed, but can also be prescribed for use once per day, every day (without.