Never purchase ED medications from a site or service that doesn’t require a prescription and medical documentation. An erection results from an increase in blood flow to the penis. In some cases, online ED providers accept health insurance. Insurance: If you plan to use insurance, make sure the online provider accepts it. All PDE5 inhibitors, including Viagra and Cialis, require a valid prescription regardless of the pharmacy or provider.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 . TADALAFIL/Cialis (tah DA la fil) treats erectile dysfunction (ED). It works by increasing blood flow to the penis, which helps to maintain an erection. It may also be used to treat symptoms of an enlarged prostate (benign prostatic hyperplasia). 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.