Viagra usually refers to sildenafil citrate tablets, and sildenafil citrate is not recommended for normal people. Young people who take Sildenafil Citrate tablets once in a while usually do not have adverse effects on sexual function, but may experience adverse drug reactions. Sildenafil citrate tablets are used to treat erectile dysfunction in men. Young people who do not have contraindications to this product, taking it once in a while usually does not cause adverse effects on sexual function. However, some adverse reactions may occur after taking it, such as flushing, headache and dizziness, dyspepsia, visual abnormalities, facial edema, generalized pain, palpitations (rapid heartbeat, often accompanied by panic), fatigue, low blood pressure and other symptoms. Therefore, the drug is not recommended for young people with normal health. In addition, it is forbidden to take the product simultaneously with any dosage form of nitrate; it is also contraindicated for allergy, minors, women, patients with severe cardiovascular diseases. If patients need Sildenafil Citrate Tablets, it is recommended to go to regular hospitals and use it under doctor’s guidance.