The efficacy and effects of valacyclovir are mainly antiviral, capable of treating shingles and herpes simplex and preventing viral infections. It should be used under medical supervision. Valaciclovir is used for the treatment of varicella zoster, type I and type II herpes simplex virus infections, including primary and recurrent genital herpes virus infections. It is an antiviral drug that inhibits viral synthesis and prevents viral infections and recurrences. In addition to its antiviral properties, vasiclovir may be used with occasional dizziness, headache, arthralgia, nausea, vomiting, diarrhea, stomach upset, loss of appetite, thirst, drop in white blood cells, mild elevation of proteinuria and urea nitrogen, and itching of the skin, and occasional acne, insomnia, and menstrual disorders with prolonged administration. It is contraindicated for those who are allergic to this product and acyclovir. Dehydration or existing hepatic and renal insufficiency should be used with caution, pregnant and lactating women should be cautious, severe immune deficiency may cause herpes simplex virus and herpes zoster virus resistance to this product after long-term or repeated application of this product treatment. Be sure to choose whether you can use the drug and the relevant dosing regimen under the guidance of your doctor. Vasiclovir has no significant effect on latent herpes simplex virus infections and does not eradicate the virus. If patients want to know the efficacy and effect of vasiclovir, it is recommended to seek medical advice in time, consult a doctor in detail, standardize the use of medication under the guidance of a doctor, and do not use it on your own to avoid adverse reactions or serious consequences.