How to Calculate Acyclovir 200 mg / 5 mL (suspension) Dose

This calculator determines the acyclovir dose for varicella (chickenpox) treatment in immunocompetent children ≥ 2 years, using a concentration of 200 mg / 5 mL (40 mg/mL):

Dose in mg:

Volume in mL:

Where:

• Weight: Child’s weight in kg or lb (converted to kg).
• Concentration: 40 mg/mL (200 mg / 5 mL).

Administer PO QID (4 times daily) for 5 days, starting within 24 hours of rash onset. ⚠️ Always consult a healthcare provider.

Using the Acyclovir 200 mg / 5 mL (suspension) Dosage Calculator

Enter the child’s weight and select kg or lb. The calculator provides the dose in mL and mg for varicella treatment, capped at 800 mg/dose.

Example: Weight 10 kg:

Varicella (chickenpox) Treatment in Immunocompetent ≥ 2 years:
5.0 mL (200 mg) PO QID x 5 days (Maximum: 800 mg/dose)
Therapy should be initiated within 24 hours of the appearance of rash.

⚠️ Calculations must be re-checked...
            

Consult a healthcare provider before administering.

Frequently Asked Questions (FAQ)

1. What is acyclovir used for in children?

Acyclovir treats varicella (chickenpox) and herpes simplex infections in immunocompetent children ≥ 2 years.

2. How often is acyclovir given for chickenpox?

Four times daily (QID) for 5 days.

3. Can this be used for children under 2 years?

No, this dosing is for children ≥ 2 years. Consult a doctor for younger patients.

4. What if weight is in pounds?

Select 'lb' and the calculator converts to kg automatically.

5. When should treatment start?

Within 24 hours of rash onset for optimal effect.