Tadalafil has a therapeutic effect in men who take it for a long period of time, but it is not recommended to take it for a long period of time. Tadalafil is mainly used to treat erectile dysfunction in men. Tadalafil has a relatively long half-life and is effective for a longer period of time. It can be taken before having sex and is not affected by diet. However, this drug is best not to be taken for a long time, if it is taken for a long time it is easy to cause patients to experience dizziness, nausea, indigestion and other adverse reactions. Tadalafil is contraindicated in people who are allergic to any of the ingredients in this product, patients who are taking any form of nitrates, guanylate cyclase stimulators, women, children and other people. Patients can take the medication in the prescribed dosage under the supervision of a doctor. During the treatment period, the diet should be careful not to eat cold, spicy and stimulating food.