Generic name of Viagra is Sildenafil Citrate Tablets, this product is an on-demand medication and does not lead to dependence in the person taking it. Sildenafil citrate tablets can increase blood flow to the penis and improve erectile function, and are mainly used in the treatment of erectile dysfunction in men. This product is used as needed before sexual intercourse and does not produce dependence, and is recommended to be used under medical supervision. Adverse reactions commonly associated with this product include flushing, headache, indigestion, nasal congestion, abnormal vision, back pain, nausea, myalgia, dizziness and rash. It is contraindicated in people with known hypersensitivity to the ingredients contained in this product and in patients taking nitrates. There are many causes of erectile dysfunction, not only physical factors, but also psychological factors. It is recommended not to rely excessively on drugs, but also to regulate from the psychological aspect. It is recommended to use the drug under the guidance of a doctor, and if you feel unwell during the medication, you should consult a doctor in time.