Viagra is the trade name and generic name of Sildenafil Citrate Tablets, the side effects and hazards include a variety of adverse reactions in the digestive, cardiovascular, and respiratory systems, such as gastroenteritis, esophagitis, palpitations (rapid heartbeat, often accompanied by panic attacks), low blood pressure, and respiratory distress. Sildenafil citrate tablets are indicated for the treatment of erectile dysfunction, and after use, facial edema, shock, abdominal pain, migraine, palpitations, gastritis, esophagitis, bone pain, neuralgia, vertigo, depression, insomnia, dyspnea, pharyngitis, sweating, exfoliative dermatitis, pupil dilatation, ocular hemorrhage, dryness of the eyes, ringing in the ears, earache, cystitis, nocturia, frequency of urination and other adverse effects are recommended to stop the drug and seek medical attention in time. The drug is forbidden to be used in combination with guanylate cyclase agonists, and is contraindicated in patients who are allergic to any of the components of the product, patients using nitrates, women, newborns, children. Patients who want to use sildenafil citrate tablets are recommended to go to a regular hospital, consult a professional doctor, cooperate with the doctor to complete the relevant examination, and avoid blind treatment.