Ribavirin granules is a western medicine antiviral drug, the drug dosage is 10mg per kilogram of body weight, such as 10kg, 10 x 10 is 100mg, equivalent to 0.1g dosage, this 0.1g all day dosage is enough. Generally bought ribavirin granules called new Bolin, its specifications are 50mg a bag, so that a bag in the morning and a bag in the evening 10kg children will be enough. If it is a 20kg child, it is 10 x 20, 200mg, which is equivalent to 0.2g, equivalent to 50mg x four bags, which is four bags, four bags throughout the day will be enough. The dosage is calculated according to the weight, individual children can increase the dosage if it is a serious viral infection, but in principle, it is not recommended to increase the dosage, because the side effects of western antiviral drugs are still relatively large.