What special dietary instructions should I follow? A small number of patients taking Cialis also reported abnormal vision. Remember that this wikiHow quiz is informational, and your results should not be considered a medical diagnosis. Cialis Regular will have a higher dosage and is not designed for daily or regular use. Check the healthdirect’s medicines section for more information about tadalafil.Tadalafil (Cialis) is used to treat erectile dysfunction (ED, impotence; inability to get or keep an erection), and the symptoms of benign prostatic hyperplasia (BPH; an enlarged prostate) which include difficulty urinating (hesitation, dribbling, weak stream, and incomplete bladder emptying), painful urination, and urinary frequency and urgency in adult men. Cialis offers may take the form of printable coupons, rebates, savings or copay cards, trial offers, or free samples. Certain offers may be printable from a site while others may . 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*.