Tadalafil does not necessarily work to prolong sex life after taking it, and this drug is mainly indicated for erectile dysfunction. Tadalafil is mainly used clinically for the treatment of erectile dysfunction in men, and there are no definitive studies stating that this medication can work to prolong sexual life. Common adverse reactions to tadalafil include dyspepsia, headache, myalgia, back pain, flushing, nasal congestion, diarrhea, and gastroesophageal reflux. Contraindications to tadalafil include prohibition of combination with guanylate cyclase agonists and nitrates; and contraindication in those with known hypersensitivity to the product. Precautions for tadalafil mainly include that it is not recommended for patients who have had a stroke, angina pectoris, grade 2 heart failure and myocardial infarction in the past six months; prolonged erections, ocular reactions, and sudden loss of hearing should be sought; and it should be used with caution in people with hepatic or renal insufficiency, and those who have bleeding disorders. Whether it is erectile dysfunction or premature ejaculation, you should seek medical treatment as soon as possible. The above drugs should be used in accordance with medical advice for treatment, do not apply the drug arbitrarily.