The following information includes only the average doses of this medicine. Do not take other medicines unless they have been discussed with your doctor. The most common side effects of VIAGRA: headache; flushing; upset stomach; abnormal vision, such as changes in color vision such as having a blue color tinge and blurred vision; stuffy or runny nose; back pain; muscle pain; nausea; dizziness; rash. It affects the way the medicine works. Especially tell your healthcare provider if you take any of the following: medicines called nitrates medicines called guanylate cyclase stimulators such as Adempas riociguat medicines called alpha-blockers, such as Hytrin terazosin HCl , Flomax tamsulosin HCl , Cardura doxazosin mesylate , Minipress prazosin HCl , Uroxatral alfuzosin HCl , Jalyn dutasteride and tamsulosin HCl , or Rapaflo silodosin.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. Sildenafil is available as oral tablets of 25 mg, 50 mg, and mg strength for erectile dysfunction (ED). Most patients receive a prescription for 50 mg of oral sildenafil, taken as needed approximately 1 hour before sexual activity. The dose can be titrated upward to a maximum of mg or down to 25 mg based on individual . AdHeute bestellen, morgen erhalten: Online-Rezept und gratis Lieferung innert 24 Stunden. Unser Online-Ärzteteam verspricht professionelle Beratung und gratis test1.ru Lieferung in 24h · Lieferung am Folgetag · One-Stop-Shop · Privatrezeptschneller und unkomplizierter gehts nicht – Trusted Shops.