Methodology We researched 19 online platforms for erectile dysfunction treatment to learn more about the process of ordering ED pills online. Stendra avanafil : This is an as-needed medication taken 30 minutes before sex and can last up to six hours. Insurance: If you plan to use insurance, make sure the online provider accepts it. What special precautions should I follow? Follow the directions on your prescription label carefully, and ask your doctor or pharmacist to explain any part you do not understand.Cialis lasts up to 36 hours in the body, while Viagra lasts 4–6 hours in the body. Both are taken 30 minutes before sex. Cialis can cause limb pain, while Viagra can cause vision change, rash. AdRead Customer Reviews & Find Best Sellers. Free, Easy Returns On Millions Of Items. Explore a Wide Range Of Clothing, Shoes & Jewelry For Men. Place Your Order : Accessibility · Pet Supplies · Pharmacy. How to take Cialis. Take one tablet at least 30 minutes before sex. The effects of Cialis can last for up to 36 hours. Never take more than one tablet within 36 hours. Alcohol will limit Cialis’ effectiveness. Do not combine Cialis with other ED medicines. Find out more about how long Cialis takes to work here. How does Cialis work.