Most men, at some point in their lives suffer from problem of erectile dysfunction. The erection problem results in the man being unable to keep their erection to allow enjoyable sex. When a man is incapable of sexual intercourse, usually because he cannot achieve or sustain an erection, he is impotent. Every man will have problems getting or keeping an erection at some time in his life.

There are many causes of erectile dysfunction, both psychological and physical factors. However physical factors contribute more than psychological factors. Psychological factors that cause erectile dysfunction include stress and anxiety, conflicts and dissatisfaction with the partner, depression, unresolved sexual orientation. There are several physical causes. Some of the most common ones are medicines for high blood pressure, depression, psychosis, anxiety, and epilepsy. Drinking alcohol or smoking cigarettes increases your risk of impotence. Alcohol can be very frustrating for men because it often increases sexual desire while decreasing the ability to function.

How Viagra helps in Erectile Dysfunction

Viagra Sildenafil is a prescription drug for erectile dysfunction treatment. Viagra (Sildenafil) belongs to a group of medicines called "PDE5 inhibitors". It is also called blue pill, which is available in three strengths - 25mg, 50mg and 100mg. Viagra will not create an erection unless a man engages in sexually exciting activity.

Viagra (Sildenafil) works by helping the blood vessels to the penis to let more blood flow. This helps to create and keep an erection. This increased blood flow is achieved by relaxing the blood vessels that supply blood to the penis.

The amount of time Viagra (Sildenafil) takes to work varies from person to person, but on average it takes between 20 minutes to one hour. Within a 4 to 6 hour period after taking the tablet an erection should occur in response to sexual stimulation. A man may find that Viagra takes longer to work if taken with a heavy meal.

As Viagra is prescription medicine, so you should ask your doctor’s prescription before you buy Viagra. Also the recommended medicine dosage as prescribed by the doctor should be taken so as to avoid any health risks.

Side Effects with Viagra Sildenafil

When taking recommended dosage, possible side effects of Viagra include headache, facial flushing, and upset stomach. These side effects are usually mild and do not last long. Other side effects include blurred vision and sensitivity to the light.

Online availability of Viagra Sildenafil

If you do not wish to visit pharmacy personally to buy Viagra then you can go for the option of Viagra online as well. Some men feel embarrassed and hesitate in visiting the doctor and asking for the prescription. Such circumstances can be avoided and you can buy Viagra online. Many online pharmacies sell Viagra online but in this case also prescription is required but you need not visit the doctor personally that is taken care of online. Moreover, if you opt to buy Viagra online, it saves time money and effort as well.