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In 비아그라 정품 with single doses up to 800 mg, adverse reactions were similar to those seen with lower doses, but the incidence rate and severity of events were increased. Administration of 200 mg doses did not result in an increase in efficacy, but the incidence of adverse reactions (headache, flushing, dizziness, dyspepsia, nasal congestion, visual disturbances) was increased.

In the event of an overdose, necessary standard supportive measures should be employed. Hemodialysis does not accelerate renal clearance because sildenafil is highly bound to plasma proteins and is not eliminated in the urine.

Viagra 50 mg: special instructions

No special instructions.

To deepen the subject, to have further recommendations, or to clarify any doubts, it is recommended to read the wholeTechnical Data Sheet of the Drug

Instructions: how to use Viagra



For men taking Viagra (or sildenafil) for erectile dysfunction, it is very important to take it as directed by the doctor or healthcare professional who prescribed it. It is also essential to follow the instructions in the patient information leaflet to ensure that the risk of side effects is minimized and that the treatment is as effective as possible.

On this page, we will review the guidelines that men using Viagra should follow. These instructions also apply to different versions of the drug, including generic Viagra and Sildenafil.
When should i take Viagra?

The best time to take Sildenafil is around 60 minutes before planning to have sex. Most men take around 30-60 minutes to metabolize in the body and get to work. So, if you take an hour before you anticipate needing it, this should give the drug plenty of time to become active in the body.

It should therefore remain active long enough for you to have sex. 비아그라 of Product Characteristics, or SPC for Sildenafil, states that it produces an erectile response to sexual stimulation for 4-5 hours after taking. If you find that it doesn’t last long enough or takes a long time to work, talk to your doctor to adjust your dose.
Taking Viagra with food and alcohol

The time it takes Viagra to kick in can also be affected by whether you eat a large meal at the same time you take it or just before. The more work your gut has to do to digest food, the less quickly it will be able to metabolize the drug, so it’s important to keep this in mind. If you eat anything before taking Viagra, try not to overeat.

The same applies to several active ingredients, such as avanafil, tadalafil and vardenafil, which perform a similar function in the body.

In the Viagra instructions you will also notice that it mentions not to drink too much alcohol when you take it. Alcohol is not thought to specifically interact with Sildenafil, but it can dull your sensitivity to arousal and make an erection more difficult. A study published in 1976 suggested that small amounts did not have a significant effect on male sexual response, but that larger amounts (1.5ml to 1.8ml per kg of body weight) had a depressing effect.

In clinical studies, grapefruit juice has been shown to interact with sildenafil and make the drug’s activity less predictable. This includes an increased risk of side effects, so you should avoid consuming it when using Viagra.