What are the potential mechanisms by which Viagra might affect sleep?

It is in the phosphodiesterase-5 inhibitor (PDE5-I) class of medications. This activity describes the indications, actions, adverse effects, and ... Since there is evidence that paradoxical sleep deprivation (PSD) elicits penile erection (PE) and ejaculation (EJ), and that the erectile. Jan 10, 2003 ... Abstract. This study evaluates the effect of sildenafil on choroidal vascular congestion and its correlation with visual effects. Viagra acts as a relatively specific vasodilator of the penile circulation that enhances prolonged muscle relaxation/vasodilation by inhibiting the action of ... Mar 21, 2022 ... You may not get any side effects at all, or these may get better over time as your body gets used to the medication. Order erectile dysfunction ... Sep 13, 2016 ... Like many other drugs, sildenafil may cause various kinds of adverse effects. Most commonly reported adverse effects include headache (16%),. Rare but serious side effects include vision problems, hearing loss, and prolonged erection (priapism) that can lead to damage to the penis. Sildenafil should ... Mixing cocaine and viagra can cause heart problems, stroke or a persistent and painful erection (lasting more than four hours) that can lead to long term damage ... Research has shown that cocaine misuse can cause marked decreases in cerebral blood flow, particularly affecting the prefrontal cortex. Aug 14, 2019 ... Summary. Viagra is a useful form of treatment for erectile dysfunction. It is best to take the drug around 60 minutes before sexual activity, ...