Millions of people around the world suffer from erectile dysfunction. Underlying causes may be both physical and psychological. Reduced blood flow to the penis or nerve damage is the most common physical causes. Psychological causes may include stress, depression, guilt and anxiety.

Today the market is full of drugs for the treatment of erectile dysfunction. Buying these drugs on line is very easy and safe.

The active ingredient found in most of these drugs is Sildenafil, Tadalafil or Vardenafil. The major difference between these drugs is in the chemical content. The effect is more or less the same.

These drugs act by blocking the PDE5 enzyme with different chemicals which in turn causes erection in men when sexually stimulated.

In the mid 1980s it was common for men with erectile dysfunction to inject smooth muscle relaxing drugs as a treatment for this problem. Certain drug companies took this as an opportunity to come up with chemicals or drugs that would make this whole process a lot easier.

This led to the discovery of Sildenafil, Tadalafil and Vardenafil.

Viagra, Viagra soft, Viagra oral jelly, Kamagra, Kamagra soft, Kamagra oral jelly, Vigora, Lovegra, Suhagra, Silagra, Eriacta etc contain Sildenafil.

Cialis, Cialis soft, Apcalis oral jelly, Tadalis, Tadacip etc contain Tadalafil.

Vardenafil is the main ingredient found in Levitra.

Sildenafil is the most popular among these drugs. It is popular because it has an excellent track record that spans for 10 years. It can be safely prescribed for men of all ages as long as their general health is good.

This drug has been used by millions of people with good results and few side effects. However it should be avoided by individuals who have a history of blood pressure or heart problems.

Sildenafil tablets come in 25 50 and 100 mg dose. The regular dosage is 50 mg. However the doctor may increase or decrease the dosage as required by individual patients.

This drug should be taken 30 minutes to 1 hour before any sexual activity and the effect may last up to 4 hours.

Avoid high fatty foods alcohol and recreational drugs while you take this medicine.

Consult your physician and follow all the precautions before using this drug.

Tadalafil works the same way as Sildenafil, but you see the effect of the drug much faster.

This drug needs to be taken 15 minutes before any sexual activity. Here there is no restriction regarding alcohol intake and heavy foods. However it is advisable to follow the dosage and precautions as prescribed by your doctor.

The effect of this drug stays much longer too. That is up to 36 hours.

This medicine comes in 10 and 20 mg doses.

Vardenafil comes in 5 10 and 20 mg doses. This medicine should be taken 15 minutes to 1 hour before any sexual activity. The effect of this drug lasts 5 to 6 hours. Vardenafil products are found to have a subdued effect on an individual's cardiovascular

system. This drug is less likely to cause visual problems. Do not take this drug on your own discretion without consulting your physician. Read all the precautions and follow them.

All these drugs are equally good. But Sildenafil is the most popular.