Seventy-year-olds can take sildenafil if they have no underlying diseases and are in good health, but they need to use it under the guidance of a doctor and pay attention to the dosage of the drug. There is no age limit for taking sildenafil, seventy year old patients can take it if they are in good health, but the starting dose should not be too high. The cardiovascular system of the elderly is more fragile due to natural aging, so if the patient suffers from high blood pressure, heart disease and other underlying diseases, it is not recommended to take, to avoid affecting the circulatory system leading to cardiovascular and cerebrovascular accidents. Possible adverse reactions to the drug are headache, facial flushing, and indigestion. Contraindications for sildenafil include patients taking nitrate drugs, women, children, etc.; adverse reactions mainly include headache, flushing, dizziness, etc. It is recommended that patients seek medical attention in time to assess their condition under the guidance of a doctor to determine whether they need to take it and take it according to the doctor’s instructions.