Cialis (Tadalafil) is available in different dosages, including 2.5mg, 5mg, 10mg, and 20mg tablets. The recommended starting dose for most men is 10mg, to be taken at least 30 minutes before sexual activity. The dosage may be adjusted based on individual response and tolerability, but should not exceed 20mg per day. For daily use to treat BPH or ED, a lower dose of 2.5mg or 5mg is usually recommended. It is important to follow your healthcare provider's instructions regarding dosage and usage.