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Viagra® poses no health risk as long as: It is taken in the absence of contraindications (such as certain history related to the heart, liver or blood pressure. It is up to the prescribing physician to ensure this) The dosage established by the doctor is respected (frequency of intake, dosage) No bothersome side effects occur the first time it is taken.It is important to keep in mind that, like all medicines, Viagra can cause more or less frequent side effects .Viagra can for example be dangerous if it is used with nitrates , which are used in particular in the composition of treatments prescribed for angina pectoris or poppers.This is why a medical consultation is essential if one wants to obtain Viagra , to ensure that this treatment is prescribed safely.What is the duration of action of Viagra?Generally speaking, most men find that the effects of the blue pill begin to wear off two to three hours after the first intake .However, the duration of action of Viagra® may vary depending on different elements: Age : The effects may last longer in men over 65 because the body's metabolism slows down with age. Alcohol : Drinking alcohol decreases blood flow to the penis. You should not consume more than one glass of alcohol because it would be more difficult to get an erection and it would make it more difficult to maintain it. Food : Taking the drug with a high-fat meal may delay the effects of Viagra® because your body will work hard to digest the food. https://www.star-viagra.net/ : if you suffer from kidney or liver problems, the effects may last longer. This is because the medicine will take longer to be eliminated by your body. The dosage : there are several dosages of Viagra® (25, 50 and 100 mg). It is up to your doctor to decide with you the most appropriate dose for your situation. This will depend on your state of health, the treatments you are taking in parallel and your reaction to the treatment. Taking medication : certain medications can modify the duration of the effects of the treatment. Always tell your doctor about your medical history and the treatments you are taking.How long does Viagra stay in the blood?The active ingredient of Viagra®, Sildenafil , is rapidly absorbed. The maximum concentration level observed in the blood is reached within 30 to 120 minutes after oral administration on an empty stomach. Within three to five hours of taking Viagra®, only half of the drug remains in the system.However, this varies from individual to individual depending on different factors. In all cases, Viagra® is naturally eliminated by the body within a few hours . Always follow the instructions given by your prescribing doctor and do not exceed the recommended dose.What are the long term effects of Viagra?Viagra does not permanently cure erectile dysfunction . The treatment only works for as long as you take it.It can therefore be taken temporarily to help get over a course (confidence problem, couple problem or other identified temporary cause). And there is no particular contraindication to taking the treatment over time, as long as it is adapted to the patient.