To ensure the efficacy of antiviral drugs and prevent the emergence of drug resistance, good compliance is important. So if antiviral drugs are missed and vomiting is still required after taking them, it is generally recommended to take them within 2 hours beyond the prescribed time, and if it is more than 2 hours, it is not necessary to take them again. If vomiting occurs after taking the medication and the medication is vomited out, a refill is required. If vomiting occurs more than 3 hours after taking the medication, there is no need to take a refill.