Tadalafil can be taken daily as a course of treatment. Tadalafil is a type 5 phosphodiesterase inhibitor and is one of the most commonly used drugs in clinical practice for the treatment of male erectile dysfunction. It is a long-acting agent with a half-life of 37 hours, so it can be taken before sex on demand or on a course of treatment in clinical applications. The frequency of the course of treatment is determined by the specific condition, and can be taken daily, every other day or every other week. The drug should be taken daily with a certain time interval when combined with nitrates and alpha-blockers such as tamsulosin.