They require a prescription for any controlled substance and have a licensed pharmacist to answer questions rather than support staff. Payment options: Consider how you’d like to pay. Refills: See if you can set up automatic refills or order as needed. Most erectile dysfunction medications belong to the drug class known as PDE5 inhibitors , which help relax the muscles and increase blood flow to allow for a full erection. It’s available in 50 mg, mg, and mg tablets. These drugs also have to be specially labeled, so many online pharmacy companies have already elected not to deliver them.Cialis (tadalafil) is a prescription medication for those with erectile dysfunction. Many providers sell Cialis online — learn about the safest and most discreet providers here. Don’t take more than one dose of tadalafil (Cialis) unless instructed by your provider. Doing so could lead to more side effects like low blood pressure, dizziness, and vision . Cialis (tadalafil) is a popular medication used to treat erectile dysfunction. It’s available in tablets ranging from mg to 20mg. It can cost more than $ for a month’s supply, .