Viagra is a medicine used to treat erectile dysfunction (ED) in males. Sildenafil citrate is an active ingreient in Viagra, a potent and selective inhibitor of phosphodiesterase type 5 (PDE5), is present in the product. By impeding PDE5, Viagra 100 mg facilitates increased blood circulation to the penis, thereby promoting erections that are more durable and enduring. Oral administration of one tablet containing Viagra 100gm with a full glass of water, 30 to 60 minutes prior to sexual activity, is the recommended dosage. It is imperative to emphasize that sexual stimulation is a prerequisite for the medication to function properly. Four to six hours is a possible duration of action for the effects of Viagra 100 mg, which presents an opportunity to engage in sexual intimacy. More information is available at bestonlinepharmacy.co.