Cialis is the trade name, generic name is tadalafil tablets, tadalafil tablets 2.5 mg can be taken for a long time, but should follow the doctor’s advice, and be careful about the frequency of medication. Tadalafil tablets are metabolized by the body’s liver and then converted into some components that are not active in the drug, and finally excreted from the body with the intestinal and urinary tract. This drug is generally not dependent, so it can be used for a long time, but you can not use an overdose, at most once a day, each time using a 2.5 mg dose of the drug a capsule. Adverse reactions such as headache and indigestion may occur after use of the drug, which can usually be gradually relieved after stopping the drug. The drug should be used with caution in patients with abnormal penile anatomy and those prone to abnormal erections. This drug should not be combined with nitrates at the same time. The use of this drug is prohibited for those who are allergic to this drug or the components of the formula, and for women. The specific dosage and usage of the above medicines should follow the doctor’s instructions and should not be used on its own to avoid adverse reactions.