When a man is sexually excited, the penis rapidly fills with more blood than usual. With this extra flow of blood, the penis then expands and hardens. After the man is done having sex, this extra blood flows out of the penis back into the body. In an opposite extreme situation, if an erection lasts for a long time (more than 6 hours), it can permanently damage your penis. You should call a doctor immediately if you ever have a prolonged erection that lasts more than 4 hours. Therefore sexual activity may not be advisable for people who have heart problems. Before you start any treatment for erectile dysfunction, ask your doctor if your heart is healthy enough to handle the extra strain of having sex. If you have chest pains, dizziness or nausea during sex, stop having sex and immediately tell your doctor you have had this problem. This is called erectile dysfunction if it becomes a frequent problem. Erectile dysfunction is a serious problem that can affect both the young and the old, involving psychological causes in some cases. Among other treatments that are nowadays available for erectile dysfunction, Viagra was the first. Some conditions and medicines interfere with the natural erection process. Erectile dysfunction, defined today as the inability to attain and maintain an erect penis with sufficient rigidity for sexual intercourse, has become an increasingly common complaint that affects 140 million men worldwide. So Viagra stands out as the pioneer of drugs that treat erectile dysfunction, for twenty years. Sildenafil citrate was the first oral agent to be introduced for the treatment of erectile dysfunction, thanks to the researchers from Pfizer. Sildenafil is the active substance of Viagra, while Viagra is the commercial name. Teva’s generic Viagra has launched already in December 2017 in the United States. Risk factors for developing erectile dysfunction include age, diabetes, hypertension, obesity, lack of exercise, dyslipidemia, smoking, depression, lower urinary tract symptoms, and pelvic surgery. Sildenafil is a highly selective inhibitor of PDE type 5 and enhances NO-mediated relaxation of human corpus cavernosum. Pfizer recently started to sell the new generic version of Viagra. buy bactrim uk Viagra is the most popular treatment for adult men with erectile dysfunction. This is when a man cannot get, or keep a hard, erect penis suitable for sexual activity. Viagra is one of a class of drugs known as PDE-5 (Phosphodiesterase type 5) inhibitors. Viagra and the other PDE-5 inhibitors can help men with erectile dysfunction (male impotence) by enhancing the erectile response when a man is sexually stimulated. Viagra normally lasts between two and three hours – but the drug can last up to five hours or longer depending on the dosage, your metabolism, along with other external factors such as age, diet, and overall health. It’s best to take Viagra on an empty stomach, as if you have it with food, it could take longer to work. Viagra should be taken an hour before sexual activity. Amoxicillin expiry date Cialis 80mg Duloxetine drug class Viagra normally lasts 4 hours but can last longer. It starts wearing off after 2-3 hours. It is possible to help Viagra last longer. metoprolol high Online Doctor covers how quickly it words, how long it lasts and other. Viagra should be consumed at least an hour before sex to allow maximum time to take. Many people wonder, "How long does Viagra last?" In most people, Viagra lasts for about four hours. Generally, it starts to lose its effectiveness after aThere are a number of factors that can increase or decrease how long Viagra lasts. Some factors that increase the amount of time Viagra stays in the. If you're looking for treatments like Viagra and you want one that lasts long enough for you then it makes sense to check how long Viagra can last. Find out how long Viagra can be made to last, which treatments stretch further, and how to last longer after orgasming. The length of time Viagra will last for will depend on individual factors. For example, some men claim the effects have lasted for up to 5 hours. However, on average the effects of Viagra tend to begin to wear off between 2 and 3 hours after taking the medication. However, some outlets suggest that you can take Viagra up to 4 hours before you intend to have sex. – you should take Viagra at least 30 minutes before you intend to have sex. In most men, Viagra begins to work around half an hour after taking the medication. Sildenafil works by helping more blood get into your penis when you are sexually aroused. An erection is produced via a complex chain of events, involving signals from the nervous system and the release of chemical messengers within the tissues of the penis. One of the messengers released when you are aroused is called cyclic GMP. Cyclic GMP relaxes and widens the blood vessels in the penis, allowing more blood to enter. Cyclic GMP is normally broken down by an enzyme in the body called phosphodiesterase type 5 (PDE5). Sildenafil is a type of medicine called a PDE5 inhibitor. It works by stopping this enzyme from breaking down the cyclic GMP. This allows the blood vessels in the penis to stay dilated for longer, which improves blood flow to the penis and helps produce and maintain an erection. Sildenafil how long does it last Sildenafil Viagra - NetDoctor, How Long Does Viagra Take To Work? LloydsPharmacy Online. Doxycycline wiki How does Viagra work? Viagra tablets contain the active ingredient sildenafil, which is a type of medicine called a phosphodiesterase type 5Prolonged erection, or persistent painful erection of the penis priapism. If your erection lasts longer than four hours, consult a doctor immediately. How long does Viagra take to work and how long does it How Long Does Viagra Last? Sildenafil citrate for erectile dysfunction Patient How much does Sildenafil cost? Sildenafil can vary in cost, according to the pharmacy's pricing and the overall health, any medications you’re taking, your diet, underlying health conditions, can all affect the amount of time Sildenafil takes to work in your body and how long it lasts. zithromax 3 day Like all drugs, sildenafil has a specific active life and half life that determine how long it lasts as a treatment for ED. In this guide, we'll explain how long sildenafil. Read on to learn how long common ED medications last, and how they work. You can even ask a doctor choosing between erectile dysfunction ED meds, there are a number of things to consider. How long do ED meds last? When can they be taken and will you be able to have sex.