Even at the highest dosage of Cialis, side effects are still uncommon. Both Cialis and Viagra work quickly. The most common symptoms of erectile dysfunction include difficulty achieving or maintaining an erection and reduced sexual desire. This leads to more blood flow to the penis, leading to stronger erections. That means you can have erections whenever you want or need them.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. Updated on June 23, Key takeaways: 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, depending . We have good news for you: generic Cialis, used to treat erectile dysfunction (ED)and enlarged prostates, just hit pharmacies. Prices for the generic, known as tadalafil, are more than 50% less than those of brand-name Cialis. As more men are able to afford tadalafil and treat their ED, it’s likely that many will have questions.