It’s recommended you try your dosage at least 8 times before reporting no results. It’s only prescribed when other dosage levels have failed to produce results. This makes it much easier for blood to flow, allowing men on the medication to attain erection. How does Viagra Sildenafil work? In the event it doesn’t work the way you want it to, then you can consult with your doctor to see about getting a higher dosage.Typical dosing for Sildenafil (Viagra) The typical dose is to take 50 mg of sildenafil (Viagra) by mouth, about 1 hour before sex, as needed. The maximum . Erectile dysfunction is common and affects many people. It’s nothing to feel embarrassed about. The most effective way to treat ED is with medications such as Sildenafil (Viagra). Luckily, you’re able to make an appointment with an accredited online doctor, here. Simply fill out a short questionnaire and wait See more.