Is Viagra available over the counter?

Feb 17, 2001 ... Here is why inhibition of the PDE has that effect: nitric oxide causes the production of a secondary signaling chemical, cyclic GMP, which leads ... Nov 28, 2019 ... Viagra can cause changes in blood pressure for some men, and both high and low blood pressure are listed as uncommon side effects of taking Viagra. Oct 19, 2014 ... Dosages used for heart ailments are lower than those used for erectile dysfunction, and patients in the study showed few side effects. “ ... Feb 23, 2008 ... The researchers then compared the behaviour of the treated sperm with standard samples and found the drug had two principal effects. It made ... May 3, 2022 ... I switched to Viagra after having issues with Cialis. Viagra gives me a bad case of heartburn, and I have started having ringing in my left ear. Dec 7, 2024 ... Frequently asked questions about Viagra · Mild side effects. Headache · Serious side effects. Priapism (a persistent and painful erection that ... Feb 25, 2020 ... Sildenafil, sold under the brand name Viagra, is ... Side effects most often emerge in men with other underlying health conditions. Combining viagra and cocaine (sildenafil) can pose serious health threats and, in some cases, may lead to life-threatening consequences. Both substances affect ... Viagra acts as a relatively specific vasodilator of the penile circulation that enhances prolonged muscle relaxation/vasodilation by inhibiting the action of ... However, unknown to a lot of people, many factors can intensify the side effects of both alcohol and Viagra; for example, other medications and supplements that ...