Viral fever injection about three to five days can be good, the specific how long can be good, different symptoms of the injection of different drugs, including antipyretic and analgesic drugs, cough expectorant drugs, anti-nasal congestion and allergy medication or antiviral drugs and so on. Viral fever is a condition in which the body is infected with a virus that causes dysfunction in the thermoregulatory center, resulting in an increase in body temperature beyond the normal range. Viral fever can be treated with medication under the guidance of a doctor, either by injection or infusion, and can usually be recovered in three to five days. 1. Antipyretic and analgesic drugs: If the patient feels fever, headache, generalized muscle pain, etc., you can use antipyretic and analgesic drugs, such as acetaminophen, aspirin, ibuprofen and so on. 2. Cough suppressing and expectorant drugs: patients with obvious cough can be treated with cough suppressing drugs, such as dextromethorphan hydrobromide, codeine and so on. 3. Anti-nasal congestion and allergy drugs: with nasal congestion, nasal mucosal congestion, edema, sore throat and other symptoms, can be applied to pseudoephedrine hydrochloride or 1% ephedrine nasal drops. For those who have frequent sneezing and runny nose, anti-allergy drugs such as chlorpheniramine maleate, loratadine or phenylephrine can be used as appropriate. 4. Antiviral drugs: antiviral drugs can effectively inhibit the virus and shorten the course of treatment, the best time to use is within 48 hours of the onset of the disease, common antiviral drugs include oseltamivir, zanamivir, paramivir and so on. If you feel unwell, you should go to the hospital in time and use the medication under the doctor’s guidance to avoid delaying your condition.