Links to other sites are provided as a convenience to the viewer. Pfizer accepts no responsibility for the content of linked sites. This website is neither owned nor controlled by Pfizer. Pfizer does not endorse and is not responsible for the content or services of this site. Continue You are now leaving to enter a website neither owned nor operated by Pfizer. Links to all outside sites are provided as a resource to our visitors and do not imply an endorsement or recommendation of a particular physician by Pfizer, nor an endorsement of any Pfizer product by a telehealth provider or any physician. Pfizer accepts no responsibility or liability for the content or services of other websites. 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. 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The biggest difference between Viagra and generic sildenafil is the amount of active ingredient in each pill. The other main difference is that generic sildenafil is FDA approved to treat Pulmonary Hypertension (that’s high blood pressure between the heart and lungs) while Viagra is FDA approved to treat erectile dysfunction. It’s a little confusing since both medications use the same active ingredient, but Viagra and sildenafil work in the same way. Each film-coated tablet contains 100 mg Sildenafil (as sildenafil citrate). Excipient with known effect: Each 50 mg film-coated tablet contains 7.3 mg lactose monohydrate. Sildenafil is indicated in adult men with erectile dysfunction, which is the inability to achieve or maintain a penile erection sufficient for satisfactory sexual performance. In order for Sildenafil to be effective, sexual stimulation is required. Use in adults The recommended dose is 50mg taken as needed approximately one hour before sexual activity. Based on efficacy and tolerability, the dose may be increased to 100mg or decreased to 25mg. The maximum recommended dosing frequency is once per day. If Sildenafil is taken with food, the onset of activity may be delayed compared to the fasted state (see Section 5.2). Elderly Dosage adjustments are not required in elderly patients (≥ 65 years old). Sildenafil tablets 100 mg Sildenafil Uses - Viagra Sildenafil Citrate 100mg Uses For Men., Viagra Sildenafil Citrate Side Effects, Interactions, Warning. Buy pfizer viagra 100mgMetformin 500How to get real viagra cheap FDA approved to treat pulmonary hypertension; Each tablet contains 20mg of sildenafil, but prescriptions are available in 20, 40, 60, 80, 100 mg doses you just. Viagra vs. Sildenafil What's the Difference? - Roman. How Long Does Viagra Last? Zava. Sildenafil 100mg 4 Tablets - Pharmacy2U. Everything You Need To Know About Sildenafil 50mg VS 100mg. 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