The usual adult dose is 20mg taken 3 times a day. Doses for children can range from 10mg to 20mg taken 3 times a day, depending on their weight. Do not take it more than 3 times a day.
Adults up to 65 years of age—50 milligrams (mg) as a single dose no more than once a day, 1 hour before sexual intercourse. Alternatively, the medicine may be taken 30 minutes to 4 hours before sexual intercourse. Your doctor may adjust your dose if needed.
The effects of Viagra can last 4 to 8 hours, depending on the individual person and the dose you take. In fact, some people may experience more than one erection during this time. However, just because Viagra can stay in your body for up to 8 hours doesn't mean your erection should last that long.
The highest recommended Viagra dose for treating erectile dysfunction (ED) is 100 mg per day, according to the drug's manufacturer. Doses of 150 mg or 200 mg would be considered off-label use.
Do not take more than one tablet in 24 hours.
Currently, 100mg is the highest dose of sildenafil that's approved by the FDA for treating erectile dysfunction. It is okay to take a 100mg dose of sildenafil, but normally, you'll only be prescribed this dosage if you still find it difficult to get or maintain an erection after using a lower dose of sildenafil.
Common physical causes of erectile dysfunction include heart disease, diabetes, nerve damage and high blood pressure. Hormonal issues, such as low testosterone, can also affect your level of sexual desire, which may stop you from getting an erection even with Viagra.
Men with ED who received sildenafil 50 mg for 2 weeks and then received a dose increase to sildenafil 100 mg had a higher proportion of completely hard and fully rigid erections and a higher rate of SSI at the initial sexual intercourse attempt with sexual stimulation and using the higher dose than they did with the ...
Some sildenafil side effects include headache, redness in the face, changes in vision, stuffy nose, muscle aches, back pain, nausea, dizziness, and rash. The frequency of these side effects may increase dramatically with a higher dose.
You can get more than one erection while on Viagra. If you ejaculate and there's still some time left for your Viagra to work, you could still be able to get another erection. You may have to wait a short time between one erection and the next, as you would do normally after ejaculating.
The concentration of Viagra in the blood peaks around 30–120 minutes after taking the drug — usually around the 60 minute mark. It is possible to start feeling the effects of Viagra at any time during this window. Viagra tablets typically come in 25, 50, or 100 milligram (mg) doses.
Results In comparison to placebo, a single 50-mg dose of sildenafil significantly increased the percentage of total sleep time with an arterial oxygen saturation of less than 90% (mean ± SD, 14.2% ± 9.1% vs 8.5% ± 3.2%, P<. 01), without a difference in the nadir of oxygen desaturation.
Regardless of your dose or individual metabolism rate, Viagra usually wears off after 4-6 hours. Note that your erection should never last more than four hours. If it does, seek medical treatment.
Speak with your healthcare provider about a different dose
If Viagra isn't working for you, you might need a higher dose. But don't experiment on your own: Always speak with a healthcare provider about dosage changes and never take more than one dose of Viagra in any 24 hour period.
Taking the pill at the right time, not taking it on a full stomach, and avoiding taking it with drug or alcohol use all might improve the effectiveness of the medication. Lifestyle changes and healthy habits may also make Viagra more effective.
Swallow tablets whole with a drink of water or juice (but not grapefruit juice). For erectile dysfunction, it's best to take sildenafil on an empty stomach. It may take longer to work if you take it with food.
Viagra doesn't start working immediately after taking it, as the medication needs time to be absorbed into your blood. For most men, it takes around 30 minutes before you start to feel the effects of Viagra. 12 minutes after – One study has shown that some men got an erection just 12 minutes after taking Viagra.
Tolerance to sildenafil has been reported,[6] but so has efficacy for up to 4 years without requirement for dose increase. [7] It is possible that tolerance, if any, is due to progression in the organic pathology responsible for the ED.
You may be more likely to experience symptoms such as dizziness, lightheadedness, fainting, flushing, headache, and heart palpitations. You should avoid or limit the use of alcohol while being treated with sildenafil, and use caution when getting up from a sitting or lying position.
The biggest difference between Viagra and Cialis is the amount of time their effects last. Viagra remains effective for 4 to 6 hours, which offers ample opportunity to have sex on multiple occasions if you wish. However Cialis typically allows you to achieve erections for up to 36 hours after taking a tablet.
The 'as required' Tadalafil (generic Cialis) has an advantage over Sildenafil in that it lasts a lot longer – up to 36 hours (compared with 4-5 hours for Sildenafil).