How does it work?

Starting this month, Brits can now buy Viagra without a prescription at UK pharmacies. In Brazil, however, it is still necessary to present the document, although it is possible to buy the drug without a prescription, as the pharmacy does not need to retain the prescription.

British health authorities announced the decision a few months ago with the intention of reducing illegal sales of the product over the internet. According to the Brazilian National Health Surveillance Agency (Anvisa), 비아그라 정품 is one of the most counterfeited drugs in Brazil.

Sildenafil, marketed under the name Viagra by pharmaceutical Pfizer, can help men with erectile dysfunction maintain an erection for satisfying sexual intercourse.

But like any other medication, Viagra can have side effects. Read below what you should know before you buy and try the pills.

For an erection to work, sildenafil, the component of Viagra, needs to increase blood flow to the penis. This same compound, although in smaller amounts, is also used in medicines that fight pulmonary hypertension.

According to data from the NHS, the UK health service, at least two-thirds of men who use the drug say it works and causes an erection.

On average, the drug takes between 30 and 60 minutes to take effect in men with erectile dysfunction. In the package insert published on Anvisa's website, the pharmaceutical company informs that a 50 mg tablet should be taken within one hour before sexual intercourse. The British health service claims that it is possible to have an erection by ingesting a pill up to four hours before.

"According to efficacy and tolerability, the dose can be increased to a recommended maximum of 100 mg or decreased to 25 mg. The maximum recommended dose is 100 mg. The maximum recommended frequency of 비아그라 정품 is once a day", informs Pfizer.

However, taking only the medicine is no guarantee of success. Sexual stimulation is also needed for the drug to work well. On the other hand, informs the British institution, the erection must disappear with the end of sexual intercourse.

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