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Author: Krka, d.d., Novo mesto


Long information

What is it?

Vizarsin is a medicine that contains the active substance sildenafil. It is available as white, oblong tablets (25, 50 and 100 mg).
Vizarsin is a ?generic medicine?. This means that Vizarsin is similar to a ?reference medicine? already authorised in the European Union (EU) called Viagra. For more information on generic medicines, see the question-and-answer document here.

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Table of Contents
What is it used for?
How is it used?
How does it work?
How has it been studied?
What benefits has it shown during the studies?
What is the risk associated?
Why has it been approved?

What is it used for?

Vizarsin is used to treat adult men with erectile dysfunction (sometimes called impotence), when they cannot get or keep a hard penis (erection) sufficient for satisfactory sexual activity. For Vizarsin to be effective, sexual stimulation is required.
The medicine can only be obtained with a prescription.

How is it used?

The recommended dose of Vizarsin is 50 mg taken as needed about one hour before sexual activity. If Vizarsin is taken with food, the onset of activity may be delayed compared with taking Vizarsin without food. The dose may be increased to a maximum of 100 mg or decreased to 25 mg depending on the effectiveness and side effects. Patients with liver problems or severe kidney problems should start treatment with the 25-mg dose. The maximum recommended dosing frequency is one tablet per day.

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How does it work?

The active ingredient in Vizarsin, sildenafil, belongs to a group of medicines called phosphodiesterase type 5 (PDE5) inhibitors. It works by blocking the phosphodiesterase enzyme, which normally breaks down a substance known as cyclic guanosine monophosphate (cGMP). During normal sexual stimulation, cGMP is produced in the penis, where it causes the muscle in the spongy tissue of the penis (the corpora cavernosa) to relax. This allows blood to flow into the corpora, producing the erection. By blocking the breakdown of cGMP, Vizarsin restores erectile function. Sexual stimulation is still needed to produce an erection.

How has it been studied?

Because Vizarsin is a generic medicine, studies have been limited to tests to determine that it is bioequivalent to the reference medicine, Viagra. Two medicines are bioequivalent when they produce the same levels of the active substance in the body.

What benefits has it shown during the studies?

Because Vizarsin is a generic medicine and is bioequivalent to the reference medicine, its benefit and risk are taken as being the same as those of the reference medicine.

What is the risk associated?

Because Vizarsin is a generic medicine and is bioequivalent to the reference medicine, its benefit and risk are taken as being the same as those of the reference medicine.

Why has it been approved?

The Committee for Medicinal Products for Human Use (CHMP) concluded that, in accordance with EU requirements, Vizarsin has been shown to have comparable quality and to be bioequivalent to Viagra. Therefore, the CHMP?s view was that, as for Viagra, the benefit outweighs the identified risk. The Committee recommended that Vizarsin be given marketing authorisation.

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