Follow all directions on your prescription label and read all medication guides or instruction sheets. Therefore the use of such treatments in combination with Cialis is not recommended. Do not chew on it or break it apart. Tell your healthcare provider that you take Cialis. Ask your doctor about any risk. BPH is caused by an enlarged prostate.Dosage for ED. • as needed dosage: 10 mg at least 30 minutes before sexual activity, with a maximum of one dose per day †. • daily dosage: mg once daily. • as needed dosage: 5 mg to 20 mg at least 30 minutes before sexual activity, with a maximum of one dose per day †. • daily dosage: mg to 5 mg once daily.  · Cialis (tadalafil) is prescribed to treat erectile dysfunction and symptoms of benign prostatic hyperplasia. It comes as a tablet that’s taken as needed or once per day, depending on the.  · Doses of up to mg of Cialis have been tested. Doses of up to mg have also been given to people once a day. Overdose symptoms were similar to the typical side effects people have had.