Acyclovir tablets instructions do not explicitly require the maximum number of days to take, this drug can be used for herpes simplex virus infections, herpes zoster, chickenpox in immunodeficient people and other diseases, the treatment of different diseases of different age patients with different dosage regimens, as follows. 1. Treatment of genital herpes and immunodeficient persons with mucocutaneous herpes simplex in adult patients continued to use the drug for 10 days, recurrent infections continued to use the drug for 5 days; chronic suppressive therapy for recurrent infections continued to use the drug for 6 months. 2. Adult patients treated for herpes zoster should continue to use the drug for 7 to 10 days. For varicella, continue for 5 days for pediatric patients over 2 years of age; continue for 5 days for pediatric and adult patients over 40 kg. Adverse effects of acyclovir tablets include dizziness, headache, arthralgia, nausea, vomiting, diarrhea, stomach upset, thirst, leukopenia, proteinuria, rash, and other symptoms, and occasional acne, insomnia, and menstrual disorders with long-term use. It is contraindicated in patients who are allergic to the drug, used with caution in patients with dehydration or hepatic or renal insufficiency, pregnant women need to weigh the pros and cons of use, lactating women should be used with caution, and the use of the drug in children under 2 years of age is not yet certain. If you need to use Acyclovir Tablets, it is recommended to consult a professional doctor and follow the doctor’s instructions to regulate the use of medication.