When choosing one, tell your doctor or other health care professional what your preferences are, such as cost, ease of use, how long the drug’s effects last and side effects. Your doctor may adjust your dose as needed and tolerated. Children 1 year of age and older weighing 20 to 45 kg—20 mg 3 times a day. Please expect up to 4 to 6 weeks for reimbursement. Slowly pull back the plunger until the required dose. Click here for an email preview. Remove the syringe from the bottle.Both Viagra and sildenafil are available in mg, mg, and mg doses. REX MD currently has a out of 5-star rating on Trustpilot as of November About 84% of the over 3, reviews. Generic Viagra (sildenafil) is available as a , , , and milligram (mg) pill and in liquid form. It’s meant to be taken as needed — about an hour before sex — but shouldn’t be. Although erectile dysfunction (ED) may be an upsetting diagnosis for some, many people find their condition is treatable with Viagra — sometimes called the “little blue pill” — and .