Generic versions of sildenafil, vardenafil and tadalafil are available. This medicine works best when you take it on an empty stomach an hour before sex. The dosage prescribed for you is based on your personal medical history and needs. However the dose is usually not more than 40 mg 3 times a day. If we combine this information with your protected health information, we will treat all of that information as protected health information and will only use or disclose that information as set forth in our notice of privacy practices. Also, the number of doses you take each day, the time allowed between doses, and the length of time you take the medicine depend on the medical problem for which you are using the medicine.The recommended dosage of Viagra for erectile dysfunction (ED) is 50 mg, taken as needed about 1 hour before sexual activity. You can take it 30 minutes to 4 hours before . 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 for one of our doctors to reach out to you about your best . Sildenafil (Viagra). This medicine works best when you take it on an empty stomach an hour before sex. The body takes longer to absorb it after a high-fat meal or alcohol. Its .