Sildenafil does not always work in people in their seventies, and specific medications must be taken as prescribed by a doctor. Sildenafil is a male erectile dysfunction treatment drug, there are drug studies suggesting that the clinical efficacy of sildenafil in elderly patients over 65 years of age may be low. In addition, the efficacy of taking sildenafil will be affected by a variety of factors such as individual physical condition, drug compliance, dosage, severity of the disease, the specific effect can be individual differences. Therefore, it is not possible to presume that sildenafil is useful or not for elderly people in their seventies. It should also be noted that sildenafil is prohibited for those who are allergic to it, also prohibited and isosorbide mononitrate, nitroglycerin and other nitrate drugs at the same time, the use of the drug process may also appear headache, insomnia, visual abnormalities and other adverse reactions. In summary, sildenafil use demand, must be strictly under the guidance of the doctor to regulate the use of drugs, in order to strive for good efficacy, and need to pay attention to the observation of the effect of the use of drugs and reaction, if there is not adapt to timely medical treatment. Do not blindly take the drug or increase or decrease the dosage on your own, so as not to cause adverse consequences.