The penis comprises an enzyme called phosphodiesterase5(PDE5) that helps in reducing the erection of the penis. Cenforce 200mg (Sildenafil Citrate) falls under the category of drugs containing phosphodiesterase5 (PDE5) inhibitors which stop PDE5 from working quickly and thus possession the penis in an erection location even after sexual intercourse. Sildenafil citrate 100mg online Appraisal is an inhibitor drug for phosphodiesterase(PDE) containing an active quantity of sildenafil citrate.