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See "Dosage adjustments" just above for details about when a lower dose might be prescribed. Physicians should inform patients not to take VIAGRA with other PDE5 inhibitors including REVATIO or other pulmonary arterial hypertension (PAH) treatments containing sildenafil. Sildenafil is also marketed as REVATIO for the treatment of PAH. The safety and efficacy of VIAGRA with other PDE5 inhibitors, including REVATIO, have not been studied [see Warnings and Precautions (5.7)]. Physicians should warn patients that prolonged erections greater than 4 hours and priapism (painful erections greater than 6 hours in duration) have been reported infrequently since market approval of VIAGRA.

Sildenafil inhibits (blocks) the enzyme PDE5 which regulates blood flow in the penis. PDE5 inhibitors multiply the natural process of arousal and increase blood flow to the penis in situations of sexual stimulation. Sildenafil helps to achieve an erection but relies on natural arousal as a trigger.

As with any drug, never change your dosage of Viagra without your doctor’s recommendation. If you have questions about the dosage of Viagra that’s right for you, talk with your doctor. Doing this can increase your risk for serious side effects. Due to age-differences in plasma protein binding, the corresponding increase in free sildenafil plasma concentration was approximately 40%. In healthy volunteers receiving sildenafil (100 mg single dose), less than 0.0002% (average 188 ng) of the administered dose was present in ejaculate 90 minutes after dosing.

There has to been any changes to your healthYou have not started any new medicationYou are not under investigation for any health conditions that have not yet been diagnosed. With any time &amp