FDA encourages anyone aware of a serious side effect, including consumers or patients, to make a MedWatch report. Follow the directions on your prescription label carefully, and ask your doctor or pharmacist to explain any part you do not understand. If you are already taking medication to treat BPH, your doctor may tell you to stop taking your other medication at least one day before starting treatment with tadalafil. One advantage Cialis has over Viagra and Levitra is its You can use Cialis on a daily basis at a lower dosage. How can I buy tadalafil?The recommended starting dose for Cialis intended for once daily use is mg, take at the same time each day, without regard to timing of sexual activity. This may be increased to 5mg/day based on need and tolerability. May be taken with or without food. Cialis is available as a generic, under the name tadalafil. 3. CIALIS 20 mg is available in blister packs containing 2, 4, 8, 10 or 12 tablets. Not all . 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*.