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Viagra and/or Generic Equivalent Sildenafil Prescription Information

Originally developed by British scientists, Viagra, also marketed under the name Revatio, is brought to the US market by Pfizer, a US based pharmaceutical company. Known under the generic equivalent name Sildenafil, this medication is used to treat two different health conditions: Pulmonary Arterial Hypertension, which occurs between Lungs and Heart, and Erectile Dysfunction, also referred to as impotence. The main role of this drug is to inhibit an enzyme that causes the degradation of cGMP, an enzyme that regulates the blood flow in the arteries, and blood vessels of the Lungs and Penis.

This medication is typically used to treat Erection problems. Before taking this drug, a person should talk to his doctor, who will make sure that the patient clearly understands how to take the medication. Patients are advised to take only one tablet, from half an hour to a maximum of four hours before sexual activity. Since this medication comes along with dangerous potential side effects, taking more than one dose a day is not recommended.

Commonly, doctors adjust the dosage based on the overall medical condition of their patients, other medications they take and response to treatment. Before deciding to buy Viagra, patients should notify their doctors of additional health problems and medications.

How does Viagra work?

Along with triacetin, lactose, titanium dioxide, hypromellose, croscarmellose sodium and microcrystalline cellulose, Sildenafil relaxes muscles in the penis, helping it to maintain an erection. It is essential to know that this ingredient cannot cause an erection without physical action to the penis. Since this medication is also able to reduce the workload of the heart by increasing the supply of blood to the lungs, it is used in both men and women to treat pulmonary arterial hypertension. Someone who wants to buy Viagra online should be aware that this medicine is available only with prescription.

Viagra Precautions

Viagra administration can decrease the blood flow to the optic nerve, damaging the eye or causing sudden vision loss. Recent studies show that the people who experienced this side effect also suffered from pre-existing eye problems, high cholesterol, high blood pressure, diabetes and heart disease. Additionally, someone with acute or chronic kidney or liver disease, blood cell disorder, stomach ulcer or physical deformity of the penis should not order Viagra without seeing a doctor. Compared to healthy individuals, these people are more likely to encounter a variety of side effects, from which the most common ones include upset stomach, flushing, headache, dizziness, blurred vision and increased sensitivity to light. If an erection lasts longer than four hours or becomes painful, the person should seek medical attention right away.

Health experts advise people not to take this medication if they use nitrate drugs for heart problems or chest pain. Some common drugs that contain nitrate are nitroglycerin, nitrite, amyl nitrate, isosorbide dinitrate and isosorbide mononitrate. Combining Sildenafil with any of these medicines may cause a dangerous drop in blood pressure. Protease inhibitors, cimetidine, erythromycin and alpha blockers also interfere with the metabolism of Sildenafil, triggering specific complications that may increase the incidence and severity of adverse reactions.