Emling S. Use Cialis Tadalafil exactly as directed on the label, or as prescribed by your doctor. Therefore, treatments for erectile dysfunction, including CIALIS, should not be used in men for whom sexual activity is inadvisable as a result of their underlying cardiovascular status. The dose of CIALIS for use as needed should be limited to 10 mg no more than once every 72 hours in patients taking potent inhibitors of CYP3A4 such as ritonavir, ketoconazole, and itraconazole [see Drug Interactions 7. Avoid the use of grapefruit products.With a Goodrx discount, the price for the generic version of Cialis (tadalafil) 5 mg is about $8 for 15 tablets. The brand version costs about $ What is the price of Cialis 20 mg? It is available in both brand and generic versions. Cialis is not covered by most Medicare and insurance plans, but manufacturer and pharmacy coupons can help offset the cost. Prices Medicare Drug Info Side Effects Images. Check your prescription. Prescription 5mg tadalafil (Cialis) (30 tablets) edit. Choose your pharmacy. moses lake, WA. Cialis is taken as an oral tablet, either as a low dose daily medication or as a higher-dose “on-demand” medication. It is the brand name for tadalafil, a medication also used to treat ED.