Sildenafil is used to treat male sexual function problems (impotence or erectile dysfunction-ED). In combination with sexual stimulation, sildenafil works by increasing blood flow to the penis to help a man get and keep an erection. This drug does not protect against sexually transmitted diseases (such as HIV, hepatitis B, gonorrhea, syphilis). Consult your doctor or pharmacist for more details. Read the Patient Information Leaflet provided by your pharmacist before you start taking sildenafil and each time you get a refill. If you have any questions, ask your doctor or pharmacist. To treat erectile dysfunction-ED, take this drug by mouth as directed by your doctor, usually as needed. Take sildenafil at least 30 minutes, but no more than 4 hours, before sexual activity (1 hour before is the most effective). A high-fat meal may delay how quickly the drug begins to work. is doxycycline a strong antibiotic 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 viagra abu dhabi Do you need a prescription to buy viagra in australia The incidence of retinal hemorrhage with REVATIO 20 mg three times a day was 1.4% versus 0% placebo and for all REVATIO doses studied was 1.9% versus 0% placebo. The incidence of eye hemorrhage at both 20 mg three times a day and at all doses studied was 1.4% for REVATIO versus 1.4% for placebo. nolvadex side effects bodybuilding See risks and benefits. Learn about REVATIO® sildenafil Capsules, a prescription treatment to help treat pulmonary arterial hypertension and the REVATIO. Find patient medical information for Sildenafil Oral on WebMD including its uses, side effects and safety, interactions, pictures, warnings and user ratings. Revatio and Viagra are two brand name medications that contain the same active ingredient, sildenafil citrate. Both drugs are phosphodiesterase-5 inhibitors that work by increasing a substance called c GMP in the blood. This article will go over their similarities and differences. This causes blood vessels to dilate which can cause different effects depending on the dose of the drug. Revatio is a brand name drug indicated to treat pulmonary arterial hypertension (PAH) in adults. PAH is a condition where blood pressure in the lungs is too high. Revatio comes in 20 mg oral tablets and 10 mg/12.5 m L injections. This can cause symptoms such as fatigue, shortness of breath, and chest pain. There is also a 10 mg/m L oral suspension available. It reaches max concentrations in the body within 30 to 120 minutes and has a half life of around 4 hours. Because Revatio causes blood pressure lowering effects, it is contraindicated with nitrate drugs and riociguat. Taking a combination of these drugs can cause severe low blood pressure. Consumer Medicine Information This leaflet answers some common questions about Revatio. It does not take the place of talking to your doctor or pharmacist. Your doctor has weighed the risks of treating you with Revatio against the benefits they expect it will have for you. It should be used only under strict medical supervision. This medicine is used to treat pulmonary arterial hypertension (high blood pressure in the blood vessels in the lungs). If you have any concerns about treatment with this medicine, ask your doctor or pharmacist. Revatio lowers the blood pressure by relaxing these vessels. Revatio contains the active ingredient sildenafil (present as sildenafil citrate) which belongs to a group of medicines called phosphodiesterase type 5 inhibitors. Revatio is not for use in children under 18 years of age. Ask your doctor if you have any questions about why this medicine has been prescribed for you. Your doctor may have prescribed it for another reason. Sildenafil revatio 20 mg oral tab Viagra vs. Cialis vs. Levitra vs. Sildenafil - Roman - Men's Health, PAH Treatment REVATIO® sildenafil Safety Info Xenical efficacy Clomid induction Buy doxycycline online canada Like viagra Cialis 20mg dose This metabolite also has an affinity for the PDE receptors, about 40% of that of sildenafil. Thus, the metabolite is responsible for about 20% of sildenafil's action. Sildenafil is excreted as metabolites predominantly in the feces about 80% of administered oral dose and to a lesser extent in the urine around 13% of the administered oral dose. Sildenafil - Wikipedia Sildenafil Oral Uses, Side Effects, Interactions, Pictures. How to Get Generic Viagra - Consumer Reports The usual recommended dose is 25 to 100 mg 1 hour before sexual activity. The maximum dose is 100 mg daily. The elderly over 65 years of age should start at 25 mg before sexual activity. Sildenafil is rapidly absorbed. Maximum observed plasma concentrations are reached within 30 to 120 minutes median 60 minutes of oral dosing in the fasted. where can i buy dapoxetine in usa Drug Information on Revatio, Viagra sildenafil oral includes drug pictures. sildenafil oral Revatio, Viagra. round, white, imprinted with RVT 20, pfizer. Feb 14, 2018. 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. For most patients, the recommended dose is 50 mg taken. Immediately after ingestion of one tablet, Sildenafil starts to absorb into the body.