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Field Field type Value generic String Sildenafil brand String Viagra, Revatio structure File classes List of String , delimiter: , PDE5 Inhibitor mechanism String Selective inhibitor of phosphodiesterase type 5 (PDE5), preventing cGMP breakdown in vascular smooth muscle. In the corpus cavernosum, potentiates the NO/cGMP cascade triggered by sexual stimulation. uses String '"`UNIQ--vote-00000705-QINU`"', '"`UNIQ--vote-00000706-QINU`"' starting_dose String 50 mg ~1 h before sexual activity (ED); 20 mg TID (PAH) preparations String 25, 50, 100 mg tabs (Viagra); 20 mg tabs and 10 mg/mL oral suspension (Revatio) fda_max String 100 mg/d (ED); 20 mg TID (PAH) pill_id Text routes List of String , delimiter: , Oral • IV (Revatio) onset String 30–60 min duration String ~4 h halflife String ~4 h bioavailability String ~40% pregnancy String Category B legal String Rx-only in US
