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are allergic to sildenafil, as contained in VIAGRA and Revatio®, or any of your ingredients in VIAGRAjust take any medicines called nitrates, frequently prescribed for chest discomfort, or guanylate cyclase stimulators like Adempas® (riociguat) for pulmonary hypertension. Your hypertension could drop to an unsafe amountVIAGRA may have an effect o