With Felix, you no longer have to take your prescription to a pharmacy. How does Cialis work? What is the difference between Viagra and Cialis? Common Cialis side effects include flushing, lightheadedness, headache, runny nose, or nausea. Cialis is widely prescribed and used in Canada as an effective treatment for erectile dysfunction. If you have any of these conditions, discuss with your doctor how Cialis Tadalafil may affect your medical condition, how your medical condition may affect the dosing and effectiveness of Cialis Tadalafil , and whether any special monitoring is needed. Speak to your doctor about how any drug interactions are being managed or should be managed.Buying prescription drugs online is easy with Canada Pharmacy. All you need to do is search for the brand or generic prescription drug using the boxes above and select your medication and checkout. Save up to 80% compared local US pharmacies and also take advantage of our price match guarantee. Brand-name Cialis. $20 for a single 5-mg oral tablet; $80 for a single or mg oral tablet; Daily generic Cialis (tadalafil) $8 for a daily mg or 5-mg tablet; Generic Cialis. What is Tadalafil? Why is it called generic Cialis? Can I get generic Cialis mailed to me? Yes, after an online consultation with one of our doctors or nurse practitioners, you can get the pills mailed to you from the Lemonaid Pharmacy in discreet plain packaging with FREE fast delivery. Get started by completing an online visit.