Viagra, sildenafil, is a medication used to treat erectile dysfunction and pulmonary arterial hypertension. It works by increasing blood flow to the genitals in order to help a man get and sustain an erection when he is sexually aroused or stimulated. Viagra is the most commonly used and most well-known erectile dysfunction treatment. In 2000, it accounted for more than 92 percent of the global market, through it had dropped by 2007 to around 50 percent. Other drugs in this class include Cialis (Tadalafil) and Levitra (Vardenafil).
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The active ingredient in Viagra, sildenafil, ranges in dosage from 25 mg to 100 mg per tablet. For most people, a recommended dose is 50 mg per day. However, Viagra may be taken anywhere from 30 minutes to 4 hours before sexual activity. The maximum recommended dosage is once per day and not exceeding 100 mg per day.
As a general rule, Viagra may take about 30 minutes to begin taking effects. The length of effectiveness also varied from person to person, but in general lasts up to 5 hours, with effects starting to wear off after 2 or 3 hours. It is also advised that the first few times that you take Viagra, its effects may not work or may not work to the effect that is expected. Most physicians advise that Viagra is taken at least eight times prior to switching to a different medication.
It is not important to eat food and there is no adverse effects from missing a dose. If you take Viagra, you should avoid drinking alcohol, as it increases the likelihood of side effects. Additionally, grapefruit juice may also have adverse interactions and effects and other medications as well. You should consult your doctor before mixing anything.
In trials the most common adverse effects of using Viagra is headaches, flushing, indigestion, nasal congestion and impaired vision. Some users have experienced tinted blue vision, while others have complained of blurriness and loss of peripheral vision. More uncommon, people have found that they have experienced prolonged erections, severe low blood pressure, heart attacks, ventricular arrhythmias, stroke increased intraocular pressure and sudden hearing loss. It should be noted that these pills do not protect against sexually transmitted diseases and individuals should practice safe sex using latex condoms.
Viagra should not be taken if you take nitrates, use any sort of street drugs, alpha blockers or have HIV. You should consult a doctor if you have had heart problems such as a heart attack or irregular heartbeat, had heart surgery, have pulmonary hypertension, have had a stroke, have low blood pressure or high blood pressure that is not controlled, have a deformed penis, a blood condition such as sickle cell anemia, any abnormal eye conditions, have had severe vision loss, bleeding problems, stomach ulcers, liver problems, kidney problems or other rare medical conditions.
In Australia, you can buy Viagra from edonlinestores.net and other online medication dispensers relatively easily. That specific sites sells brand Viagra for between $2 and $11 per pill, depending on the quantity of pills and dosing you buy.
I am General practitioner (GP) in Melbourne since 2006.