Sildenafil citrate is the scientific name of Viagra, which is commonly used to treat erectile dysfunction problems in men. C22H30N6O4S is the chemical formula of the drug. Viagra works by inhibiting the enzyme cGMP-specific phosphodiesterase type 5, which slows the destruction of cGMP and controls the flow of blood into the penis. This allows an erection that is suitable for sexual stimulation. The drug is available in three amounts - 25 mg, 50 mg and 100 mg.

Consider the following before buying sildenafil citrate online

Application: Before using Sildenafil, you must tell the doctor about your health history, as the drug may contain inactive ingredients, which can cause some allergic reactions. Some tips for use, as follows:

Sildenafil citrate 25 mg dose is sufficient to use in the home for those men who are facing the problem of erectile dysfunction. This may be an increase or decrease according to your health. And should consult a doctor before increasing the dose.

Do not take Sildenafil citrate if you are using a nitrate drug. How this can cause a sudden and serious decrease in blood pressure. This should be taken once a day for half an hour before sexual activity. Do not take Viagra more than once a day.

Common side effects of Sildenafil Although you may experience some common side effects are listed below:

Headache, stomach upset, dizziness, nausea, indigestion, back pain, nasal congestion, facial flushing, neck, chest, or tenderness, diarrhea

If you experience chest pain and have taken Viagra over the past 24 hours or Cialis in the last 48 hours, do not take nitroglycerin, and make sure you say that comes EMS, you have depending on ED medicine you take.

You also need to stop taking this medicine and call your doctor at once if you have a loss of vision.

Internet sites have hundreds of evangelization for Provigil, which explain how to get a prescription or doctor how to get one without the drug.

Many users provihil secretive, but not Espri Dave, a successful executive billion Internet security firms that often begins his day at 4:45 am by popping pills.

"[It] can be the difference between I just do it one day that I had the best day of my life," said Espri ABC News.

Espri times he says flew 20 hours to Australia almost without sleep, came out of the plane, took Provigil and gave a series of speeches that were so good they made the local newspaper.

As a kind of experiment ABC News asked Espri stop taking the drug for three days. Off the drug, he said he felt off.