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are allergic to sildenafil, as contained in VIAGRA and Revatio®, or any of the elements in VIAGRAtake any medicines called nitrates, usually prescribed for chest pain, or guanylate cyclase stimulators like Adempas® (riociguat) for pulmonary hypertension. Your blood pressure could drop to an unsafe amountVIAGRA might affect the best way other medi