Conclusions: Sildenafil is an effective oral treatment for ED that produces a penetrative erection as early as 12 min and for most patients, within 30 min after dosing, and a duration of action lasting at least 4 h.
In healthy volunteers, sildenafil doses are absorbed rapidly, with maximum plasma concentrations achieved within a median time of 1 h (range, 0.5–2 h) after dosing [3].
The bottom line
Viagra can be an effective option to help you achieve and maintain an erection. To get the best results, take it on an empty stomach at least an hour before sexual activity, and follow the instructions from your provider.
Viagra (sildenafil) is an oral medication that's used to treat erectile dysfunction. You can take Viagra take 30 minutes to 4 hours before sexual activity, but it shouldn't be taken more than once daily. For most men, Viagra begins to work within an hour.
Viagra helps to maintain the erection after ejaculation and reduces the refractory time before a second erection can be obtained.
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.
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.
Taking Sildenafil 100mg
The effects of Sildenafil 100mg do not last longer than the 50mg dosage, but they tend to be stronger. This means that side effects can be more pronounced as well. Side effects associated with Sildenafil include headache, facial flushing, nausea, dizziness and stuffy nose.
Taking the pill at the right time, not taking it on a full stomach, and avoiding taking it with excessive drug or alcohol use all might improve the effectiveness of the medication if Viagra doesn't work for you. Lifestyle changes and healthy habits may also improve your experience with Viagra.
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.
Tolerance to sildenafil has been reported,[6] but so has efficacy for up to 4 years without requirement for dose increase.
The usual dose is 50mg, when you need it. Do not take it more than once a day.
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.
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.
Viagra does not stimulate you sexually, it can only help you get an erection once you're already aroused. Because Viagra only helps you to get an erection by improving blood flow to the penis, it doesn't force you to get an erection, so it won't work unless you're sexually stimulated.
A penile erection can normally last anywhere from a few minutes to about half an hour. On average, men have five erections a night while they're sleeping, each lasting about 25 to 35 minutes (Youn, 2017).
Pfizer, the company that manufactures this drug, has confirmed that the typical Viagra user is on average 53 years old. The company does not keep records of users younger than 33 years. The drug should not be used in young men who do not have erection problems.
Genuine Viagra® makes it possible
In short, drinking one or two cups of coffee per day could reduce the risk of experiencing ED, assuming you're drinking regular strength coffee. However, it's important to note that this is very much a correlation does not equal causation type of situation.