Viagra generally refers to Sildenafil Citrate Tablets, there is a possibility of side effects in men taking Sildenafil Citrate Tablets, but due to the variability of individual constitution, some patients may not experience side effects and it is not possible to generalize. Sildenafil Citrate Tablets can be used to treat erectile dysfunction in men. The usual side effects of Sildenafil Citrate Tablet include headache, flushing, muscle pain, indigestion, nausea and dizziness. Some patients may experience side effects while taking the medicine, but some patients may not experience side effects due to their different physique, and the specific situation should be based on their own situation and comprehensive judgment, and it is impossible to make a generalization. People who are allergic to the ingredients of Sildenafil Citrate Tablets, as well as women and children, should refrain from taking this drug. People who are taking nitrate drugs are also prohibited from taking this drug. Elderly people need to be careful when taking this drug and should be under the guidance of a doctor. During the period of taking Sildenafil Citrate Tablets, patients need to follow the doctor’s instructions for regular review, in order to understand the recovery of the body. Once uncomfortable symptoms appear, need to consult a doctor in time.