Viagra specifically refers to sildenafil citrate tablets, which are not recommended for normal people, and sildenafil citrate tablets have specific indications for use, and should be used in accordance with medical advice. Sildenafil citrate tablets are commonly used in the treatment of erectile dysfunction of the penis, but need to have an indication for the use of medication can only be used under the guidance of a physician, and normal people do not have erectile dysfunction, and therefore do not need to take. Normal people may also experience adverse drug reactions such as nasal congestion, back pain, myalgia, headache, vision abnormalities, rash, indigestion, dizziness, nausea, etc., which are detrimental to health. Before use, it should be noted that the drug is prohibited from combining with nitrate drugs, and this drug is prohibited for women, people who are allergic to this product, children, and people who should not have sex in recent cardiovascular states. Specific use of the drug should follow the doctor’s instructions, not unauthorized use.