Acyclovir is an antiviral drug, long course of medication is mostly used for chronic suppression of recurrent infections, and the dosage should not be reduced arbitrarily, so as not to affect the therapeutic effect. Acyclovir is an antiviral drug that can be used in the treatment of herpes simplex and recurrent herpes virus infections, immunodeficiency diseases, skin and mucous membrane herpes simplex and recurrent herpes, and other diseases. For those who use the drug for a long course of treatment, it is not recommended to adjust the dosage and frequency of the drug on your own, so as not to affect the therapeutic effect. However, in case of liver function impairment, kidney function impairment and other conditions that require adjustment of the drug regimen, it is recommended to go to the hospital and have a professional clinician make adjustments after a comprehensive assessment of the condition and physical condition. At the same time, it should be noted that the drug is prohibited for drug allergy; if there is dehydration, severe liver and kidney dysfunction, it is recommended to use the drug with caution. The drug is recommended to be used under the supervision of a physician.