Generally, Dacronin and Sildenafil are not in conflict and the two can be used together. Dacronin is a local anesthetic drug, commonly used clinically for laryngeal anesthesia during upper gastrointestinal endoscopy. Contraindications are allergy to the product, acute illnesses, patients with heart block, severe shock, sepsis, etc.. Adverse reactions include anxiety, headache, and sensory abnormalities. Sildenafil is a drug used to treat erectile dysfunction in men. Contraindications are hypersensitivity to this drug, hepatic and renal impairment, recent stroke, hereditary retinopathy. Adverse reactions include damage to the cardiovascular system, endocrine system, respiratory system, urinary system. There is no conflict between the use of the two, but it is recommended to use the drug under the guidance of a professional doctor to avoid adverse reactions.