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Viagra instructions – dosage options, efficiency, warnings & overdose

Viagra is one of the most popular anti-ED medical remedies, which have clinically proven efficiency. This drug is only available on prescription. In order to get a prescription, you should visit your doctor. Alternatively, you can get a prescription from special websites accredited by public authorities.

Dosage options

Dosage of the medicament can only be chosen by a qualified medical expert. There are three kinds of the drug preparation – 25 mg, 50 mg and 100 mg. Some generics can contain a large dose of sildenafil. If you have purchased a 200 mg drug, you can divide it into 2 parts, because the maximum safe dose of Viagra is 100 mg.

For the prevailing part of patients the recommended dose is 50 milligrams. Depending on the tolerability and efficacy the medicament dose may be increased to a maximum or reduced by half to 25 mg. The minimum interval between tablet administrations should be not less than 1 day. These tips are applied to the full extent to several versions of the medicament – generic Viagra.

The factors that influence the dosage are the following:

• the age of a male person;
• suffering from other ailments, such as heart ones or high blood pressure;
• the degree of impotence and its nature (organic or psychological);
• the use of other medical remedies.

Viagra efficacy – official experimental data

According to the data, which can be found on the official website of the developer of the drug (Pfizer), Viagra has the following performance:
1) 72 per cent of men who took Viagra had good erection sufficient for sexual intercourse, while among the men, who took placebo, the rate was 50%;
2) four out of five patients treated with 50 mg sildenafil managed to achieve good erection;
3) the dosage of 100 mg increased efficiency of the medical remedy to 85%.
Therefore, it can be concluded that the higher medicament dose, the higher its efficiency. However, for many men the tablet of 50 mg or less will be sufficient.

Warnings

Unfortunately, not all male persons suffering from ED can take Viagra. The drug is strictly contraindicated if a patient is taking nitrates (medications used to treat angina). It can even lead to fatal outcome. Also it is counter-indicated to male persons having peptic ulcer in acute stage, predisposed to priapism (prolonged and painful penile erection during four hours), suffer from penis deformations etc. It is important to limit your alcohol consumption when taking Viagra. Both the medicament and alcoholic drinks lower blood pressure.

Overdosing

The researchers conducted clinical experiments in which participants took 800 mg of the drug. As a result, they could observe more frequent and more severe adverse effects. To eliminate the effects of an overdose, it is best to go to the hospital. Often expectant treatment is needed, in some cases in a casualty unit. Overdose situation is complicated by the fact that dialysis (blood purification) is not effective, since the main component of the medicament is excreted with the urine only.