If you prefer, you may contact the U. Operational Definitions Recreational use: Use of a drug to advance certain activity sexual performance without a definite need or any medical condition. The onset of action can occur within 30 minutes, while the duration of the effect can last up to 18 hours. The most common side-effects associated with the use of sildenafil as reported by the study participants were dizziness and headache. Consider starting at a dose of 25 mg in patients with hepatic dysfunction e. Call your doctor right away if you have blurred vision, confusion, dizziness, faintness, or lightheadedness when getting up from a lying or sitting position suddenly, sweating, or unusual tiredness or weakness. However the dose is usually not more than 40 mg 3 times a day.1 day ago · How we vet brands and products. If you’re interested in buying Viagra online, five of the best options available are Hims, Roman, Lemonaid, Optum Store, and REX MD. Read on for full details on. Viagra comes as an oral tablet in different dosages. Discuss with your doctor what’s an appropriate dose for you. For daily use, Goldstein said, the generic form, sildenafil, comes in mg tablets. AdSay Goodbye to Performance Anxiety and Hello to Improved Sexual Stamina! Trust Our Unbiased Reviews and Improve Your Sexual Health in Confidence!test1.ru has been visited by 10K+ users in the past month.