The generic name of the aphrodisiac Viagra is sildenafil citrate and its main effect is to treat erectile dysfunction. Sildenafil belongs to type 5 phosphodiesterase inhibitors, which can be used to treat erectile dysfunction, and can be taken to maintain better erection time and erection hardness during sex, but the drug needs to be sexually stimulated to be effective after taking it. Adverse reactions such as dizziness, headache, nosebleed, nausea, vomiting, abdominal distension, increased heart rate, postural hypotension, and myocardial ischemia are possible when taking the drug. It is prohibited for those who are allergic to the ingredients; it is prohibited while taking nitrate drugs; it is potentially dangerous to the heart, and should be used with caution in patients with heart disease. Physical disease, it is recommended to first go to the hospital for examination, follow the doctor’s instructions for medication, to avoid their own abuse of drugs.