Vasiclovir Hydrochloride Tablets have antiviral properties. It is used for the treatment of varicella zoster and herpes simplex virus type I and II infections, including primary and recurrent genital herpes virus infections. The overall side effects of vasiclovir hydrochloride tablets are not significant, dizziness, arthralgia, nausea, diarrhea, loss of appetite, drop in white blood cells, itching of the skin and other adverse reactions may occur after use, and long-term use of the drug may result in acne, insomnia, menstrual disorders. Precautions: People who are allergic to ganciclovir may also be allergic to this product. Use with caution in those who are dehydrated or have pre-existing hepatic or renal insufficiency. Resistance may be induced in persons with severe immunodeficiency after prolonged or repeated treatment with this product. Contraindications: It is contraindicated for those who are allergic to this product and acyclovir. Patients are advised to use the drug strictly under the guidance of a physician, and not to use the drug privately, change the dosage and stop the drug.