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What other drugs will affect Viagra. Do not take Viagra with similar medications such as avanafil (Stendra), tadalafil (Cialis) or vardenafil (Levitra). Tell your doctor about all other medications you use for erectile dysfunction. Tell your doctor herinneringskosten legaal viagra all your current medicines and any you start or stop using, especially: drugs to wikitaxi alternatives to viagra high blood pressure or a prostate disorder; an antibiotic - clarithromycin, erythromycin, or telithromycin; antifungal medicine - ketoconazole or itraconazole; or. medicine to treat HIVAIDS - atazanavir, indinavir, ritonavir, or saquinavir. This list is not complete.

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Viagra was originally developed as a treatment for angina. It was designed to dilate blood vessels and prevent platelets, a type of blood cell, from clumping and forming clots. Related Articles. It was only when men taking part in a clinical trial reported unexpected side-effects that Pfizer realised it could treat erectile dysfunction. However, a study published today in the science journal Cell suggests that Viagra can encourage platelets to clump together by elevating levels of a compound called cGMP. The finding challenges 20 years of scientific assumptions that cGMP prevents platelet aggregation.

Generic Name: sildenafil (oral) (sil DEN a fil) Brand Names: Revatio, Viagra. What is Viagra.]