Doxycycline 25 mg / 5 mL Dosage Calculator

How to Calculate Doxycycline 25 mg / 5 mL Dose

This calculator determines the Doxycycline dose for treating bacterial infections or Lyme disease prophylaxis, using a concentration of Doxycycline 25 mg / 5 mL, based on the patient’s weight (for children ≥8 years) or age group:

Dose in mL and mg (based on Doxycycline component):

Children ≥8 years: 2.2 mg/kg/dose po BID

Children ≥8 years (Lyme disease prophylaxis): 4.4 mg/kg po once as a single dose (within 72 hours of tick removal)

Adult Dose: 200 mg po once as a single dose (within 72 hours of tick removal)

Drops Calculation:

For children ≥8 years: Dose = Weight (kg) × 2.2 mg/kg for BID, or Weight (kg) × 4.4 mg/kg for Lyme prophylaxis, converted to mL (5 mg/mL, expressed in 5 mL units).

Where:

Weight: Patient’s weight in kilograms or pounds (minimum ~5 kg for children ≥8 years, automatically converted to kg) for children; not used for adults.
Dosage Regimen: Select 2.2 mg/kg/dose po BID or Lyme disease prophylaxis: 4.4 mg/kg po once as a single dose (within 72 hours of tick removal) for children ≥8 years.
Concentration: Doxycycline 25 mg / 5 mL (5 mg/mL, doses expressed in 5 mL units).

Administer twice daily (BID) for infections or once as a single dose for Lyme prophylaxis. ⚠️ Always consult a healthcare provider.

Using the Doxycycline 25 mg / 5 mL Dosage Calculator

Enter the patient’s weight (for children ≥8 years), select the weight unit (kg or lb), and choose the dosage regimen. The calculator provides the dose in mL and mg for children ≥8 years and includes the adult dose.

Example: Children ≥8 years, Weight 12 kg, Lyme disease prophylaxis:

Children ≥8 years:
Lyme disease prophylaxis: 10.6 ml (53 mg) po once as a single dose (within 72 hours of tick removal)

Adult Dose:
200 mg po once as a single dose (within 72 hours of tick removal)

Calculations must be re-checked and should not be used alone...

Consult a healthcare provider before administering.

Frequently Asked Questions (FAQ)

1. What is Doxycycline used for?

Doxycycline (Doxy; Doxycin; Doryx; Vibramycin) is used to treat bacterial infections, acne, and for Lyme disease prophylaxis after tick bites.

2. How often is this given?

Twice daily (BID) for infections: Children ≥8 years: 2.2 mg/kg/dose, Adults: not specified weight-based. For Lyme prophylaxis: once as a single dose—Children ≥8 years: 4.4 mg/kg, Adults: 200 mg (within 72 hours of tick removal).

3. Can this be used for children under 8 years?

No, Doxycycline is not recommended for children < 8 years old due to the risk of tooth discoloration and enamel hypoplasia.

4. What if weight is in pounds?

Enter the weight in pounds for children ≥8 years, and the calculator will automatically convert it to kilograms for calculation (1 lb = 0.4536 kg approximately).

5. What’s the adult dose for Lyme prophylaxis?

200 mg po once as a single dose (within 72 hours of tick removal).