How might individual genetic variations affect a person's response to Viagra?

How does Viagra work? ... Viagra relaxes the muscle cells in the blood vessels supplying the penis, allowing an increased blood flow. Erections occur when blood ... Mar 31, 2025 ... What is Viagra? Viagra relaxes muscles found in the walls of blood vessels and increases blood flow to particular areas of the body. Viagra is ... 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, ... Since there is evidence that paradoxical sleep deprivation (PSD) elicits penile erection (PE) and ejaculation (EJ), and that the erectile. Dec 14, 2021 ... Impact of NIH Research · Science, Health, and Public Trust. You are ... After considering other factors, the top candidate was sildenafil, also ... Rare but serious side effects include vision problems, hearing loss, and prolonged erection (priapism) that can lead to damage to the penis. Sildenafil should ... The significance of these effects in dogs and cats is unknown. This short-acting medication should stop working within 24 hours, although can last longer in ... Jul 30, 2019 ... The three rivals -- Viagra, Cialis, Levitra and Stendra-- have similar side effects, including headache, facial flushing, nasal congestion ... Research has shown that cocaine misuse can cause marked decreases in cerebral blood flow, particularly affecting the prefrontal cortex. Viagra side effects · sensitivity to light · muscle aches · heartburn · nose bleeding · flushed skin · problems falling asleep · tingling in the arms, feet, ...