Common side effects include headache, facial flushing, indigestion, and dizziness. It works best when taken one hour before sex. Methodology We researched 19 online platforms for erectile dysfunction treatment to learn more about the process of ordering ED pills online. The most common symptoms of erectile dysfunction include difficulty achieving or maintaining an erection and reduced sexual desire. Viagra Choosing the right ED pill can be intimidating. Popular ED medications found online include: Viagra sildenafil : As the first FDA-approved PDE5 inhibitor for ED, sildenafil is taken 30 minutes to four hours before sexual intercourse to help achieve and maintain an erection.Side Effects. Headache, stomach upset, back pain, muscle pain, stuffy nose, flushing, or dizziness may occur. If any of these effects last or get worse, tell your doctor or pharmacist promptly. To. Ordering Cialis from an online Canadian pharmacy is a simple process. Add your desired strength and quantity to your cart and visit our sign-up page or log in to an existing account to fill your prescription. For more information, visit our Order Process page or call our Care Team 7 days a week at Learn more about Cialis oral. 1. This is a generic drug. The average cost for 30 Tablet(s), 5mg each of the generic (tadalafil) is $ You can buy tadalafil at the discounted price of $ by using the MDRx coupon, a savings of 93%. Even if this drug is covered by Medicare or your insurance, we recommend you compare prices.