Read and follow these instructions carefully before you start using sildenafil and each time you get a refill of your medicine. Online ED consultations offer privacy, convenience, and affordability while allowing you to quickly get the medications you need—the same day, with some services. Remember: if the 50mg strength has not provided the desired outcome, after at least 8 separate attempts you can move up to mg. In some cases, ED can cause a strain on relationships and impact self-esteem. Children 1 year of age and older weighing 45 kilograms kg or more—20 mg 3 times a day. This boosts blood flow and helps you get an erection from sexual activity. If approved, the provider will issue a prescription.In people having trouble with erections, PDE-5 may work too quickly. Viagra works by blocking the PDE-5 from working. This way, blood flow to the penis can occur . 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 .  · For treatment of erectile dysfunction: For oral dosage form (tablets): Adults up to 65 years of age—50 milligrams (mg) as a single dose no more than once a day, 1 .