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are allergic to sildenafil, as contained in VIAGRA and Revatio®, or any with the elements in VIAGRAVIAGRA should not be applied with REVATIO or with other PAH treatments containing sildenafil or every other PDE5 inhibitors (like Adcirca® [tadalafil])The most typical side effects of VIAGRA: headache; flushing; upset belly; irregular eyesight, such