Ribavirin is a broad-spectrum antiviral drug, and the dosage of the injection depends on the specific disease and age. In the case of adults with epidemic hemorrhagic fever, the daily dosage can be up to 1 g. The dosage needs to be divided into two doses of 0.5 g. Ribavirin injection is 100 mg per dose and each time 5 doses are used, the daily dosage is 10 doses. Children need to calculate the dosage according to their body weight. The more common clinical application of ribavirin in children is hand, foot and mouth disease or herpes pharyngitis. This is caused by viral infections such as enterovirus 71, or coxsackievirus group A type 16. Because there are no specifically targeted antiviral drugs, ribavirin is clinically chosen for injection at 10-15 mg per kg of body weight. for a 10 kg child, one to one and a half ribavirin doses per day are optional and also need to be divided into two injections.