Patients are advised not to exceed a maximum dosing frequency of once daily. How and when to take sildenafil It’s important to take sildenafil as advised by a doctor or pharmacist. Use only the brand of this medicine that your doctor prescribed. None of these procedures has been proved to be safe or to work. 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. Children younger than 1 year of age—Use and dose must be determined by your doctor.Sildenafil citrate is a white to off-white crystalline powder with a solubility of mg/mL in water and a molecular weight of VIAGRA is formulated as blue, film-coated rounded-diamond-shaped tablets equivalent to 25 mg, 50 mg, and mg of sildenafil for oral administration. This means that 4 hours after you take a dose, your body has cleared half of the dose. In most cases, it takes about 5 half-lives for your body to completely remove a drug from your system. So. AdTake Charge of Your Sexual Health with Our Top-Rated Male Enhancement Products! Reviews and Comparisons Of The Best Male Enhancement Products. See Which Products test1.ru & Unbiased Reviews · Over 20 Years Online · Over Products Tested10K+ visitors in the past month.