Tadalafil is sometimes taken as needed, usually at least 30 minutes before sexual activity and not more often than once every 24 hours. How should this medicine be used? It works to treat erectile dysfunction by increasing blood flow to the penis during sexual stimulation. Combined use could lead to additional lowering of blood pressure, possibly to unsafe levels. There may be rare occurrences of priapism or painful, prolonged erections. Cialis will be available as oral tablets in 5mg, 10mg and 20mg strengths. The number of tablets per box can significantly increase the cost per tablet.FUTRELL PHARMACY OF LITTLETON. $ E S Main St. Littleton, NC mi. Closed. () Get Coupon. Add to Pricing Basket. Average Cost of Cialis. The different dosages of the drug affect the cost of the treatment. The dosage classified into two group with the same range of price, namely, the mg/5mg and 10mg/20mg. The average cost of Cialis within mg/5mg group is around $ to $ per tablet while the other group costs around $ to $ per tablet. MNT ‘s review. Lemonaid sells Cialis in these forms: Cialis: available in doses of 5, 10, and 20 mg, starting at $65 per tablet. Daily Cialis: 5 mg tablet with pricing starting from $50 per tablet.