Viagra may affect the way other medicines work, and other medicines may affect the way
Viagra works causing side effects. Especially tell your healthcare provider if
you take any of the following:
medicines called nitrates (see “What is the most important information I should know about Buy Viagra Online?”)
medicines called guanylate cyclase stimulators, such as riociguat (Adempas)
medicines called alpha blockers such as Hytrin (terazosin HCl), Flomax (tamsulosin HCl), Cardura (doxazosin mesylate), Minipress (prazosin HCl), Uroxatral (alfuzosin
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.
sildenafil, which is the same medicine found in another drug called REVATIO. REVATIO is used to treat a rare disease called pulmonary arterial
hypertension (PAH). Viagra should not be used with REVATIO or with other PAH treatments containing sildenafil or any other PDE5 inhibitors (such as Adcirca
Ask your healthcare provider or pharmacist for a list of these medicines, if you are not sure. Viagra is used to treat erectile dysfunction, more commonly known as
impotence, in men. This is when a man cannot get, or keep, a hard erect penis suitable for sexual activity. Viagra will work only if you are sexually excited.