Sildenafil may cause side effects. However, the dose is usually not more than 80 mg 3 times a day. Do not keep outdated medicine or medicine no longer needed. If you are taking sildenafil for erectile dysfunction, your doctor will probably start you on an average dose of sildenafil and increase or decrease your dose depending on your response to the medication. This can happen if you are sick with fever, diarrhea, or vomiting; sweat a lot; or do not drink enough liquids. To provide you with the most relevant and helpful information, and understand which information is beneficial, we may combine your email and site usage information with other information we have about you.Take sildenafil at least 30 minutes, but no more than 4 hours, before sexual activity (1 hour before is the most effective). Do not take more than once daily. A high- fat meal may delay how. AdSearch Free Coupons for your Prescription. Risk Free, No Sign-Up. Instantly Download Now! Find the Lowest Price for Your Local Pharmacy. Compare Multiple Offers test1.rue: Bonus savings, Discount cards, Browse prescriptions, Drug classe. AdWe stock a wide variety of off grid & grid tie solar equipment from controllers to panels. Shop Northern Arizona Wind & Sun for Low Prices, Expert Knowledge & Great Customer ServiceKnowledgeable Staff · Quick & Easy Checkout · 35 Years Running.