Other conditions that may disqualify you from an ED prescription include a history of stroke, kidney or liver disease, cancer, diabetes, or a bleeding disorder. Make sure to get an estimate of when you can expect your prescription in the mail. This is important for your overall health and safety, as certain medications can negatively interact with each other or cause existing conditions to worsen. That’s not to say there aren’t just as many illegitimate sites. Some people may also have ringing in their ears tinnitus or dizziness. Please expect up to 4 to 6 weeks for reimbursement. It may be difficult to remain firm despite wanting to have sex.VIAGRA is available by prescription only in 25 mg, 50 mg, and mg tablets. Patients should always ask their doctors for medical advice about adverse events. You are encouraged to report adverse events related to Viatris products by calling 1 . Typical dosing for Sildenafil (Viagra) The typical dose is to take 50 mg of sildenafil (Viagra) by mouth, about 1 hour before sex, as needed. The maximum recommended dose is mg. Don’t take sildenafil (Viagra) more than once daily (at any dose). Written by Brian Leonard, PharmD, BCACP, BCGP.  · The highest recommended Viagra dose for treating erectile dysfunction (ED) is mg per day, according to the drug’s manufacturer. Doses of mg or mg would be considered off-label use.