Transfer your prescription for Cialis (Brand for Tadalafil, Oral Tablet) on Amazon Pharmacy. FREE SHIPPING for Prime members.No, Cialis does not lose potency over time. Cialis for daily use is a good choice if you have sex three or more times a week. You can buy it from a store-based pharmacy or reputable online pharmacy with a prescription. Another clinical trial with more than 1, men using tadalafil for up to 24 months found no serious adverse effects to long term use. Cialis is an effective treatment for mild to severe ED.CIALIS for Use as Needed. Creatinine clearance 30 to 50 mL/min: A starting dose of 5 mg not more than once per day is recommended, and the maximum dose is 10 mg not more than once in every 48 hours. Creatinine clearance less than 30 mL/min or on hemodialysis: The maximum dose is 5 mg not more than once in every 72 hours [see . headache. indigestion. back pain. muscle pain. flushing. stuffy nose. Patients who get back pain and muscle aches usually get them 12 to 24 hours after taking Cialis and these usually go away by. Dosage range: mg to 5 mg. Frequency: once daily, regardless of the timing of sexual activity. Cialis’s recommended dosage when it’s taken as needed for ED is as follows. Dosage range: 5 mg to 20 mg. Frequency: one dose at least 30 minutes before sexual activity, with a maximum of one dose per day*.How long does Cialis take to work? Treated trusted source Brock, G. Cialis will be available by prescription only. Is Cialis for men only? It can also interact with many medicines, particularly nitrates used in some types of heart disease and blood pressure medicines. The study found no safety concerns. Cialis should begin to work in minutes.