How to Calculate Clemastine 0.5 mg/5 mL (suspension) Dose

This calculator determines the Clemastine dose for treating allergic reactions, using a concentration of Clemastine 0.5 mg/5 mL (0.1 mg/mL), based on the patient’s weight or age and dosage regimen:

Dose in mg and Volume in mL (based on Clemastine component):

Volume Calculation:

Where:

• Weight: Patient’s weight in kilograms or pounds (minimum ~5 kg for pediatric, automatically converted to kg).
• Dosage Regimen: Select 0.05 mg/kg/day po divided BID prn for <6 years (weight-based).
• Concentration: Clemastine 0.1 mg/mL (0.5 mg/5 mL).

Administer as needed (prn) for allergic symptoms. ⚠️ Always consult a healthcare provider.

Using the Clemastine 0.5 mg/5 mL (suspension) Dosage Calculator

Enter the patient’s weight, select the weight unit (kg or lb), and choose the dosage regimen (0.05 mg/kg/day po divided BID prn for <6 years). The calculator provides the dose in mL and mg for different age groups (<6 years, 6-12 years, and >12 years/adults).

Example: Weight 10.5 kg, 0.05 mg/kg/day po divided BID prn:

<6 years (Weight-based dosing):
2.6 mL (0.26 mg) po BID prn

6-12 years (Age-based dosing):
5 mL (0.5 mg) po BID prn

>12 years and Adults:
10 mL (1 mg) po BID prn, may be increased to 20 mL (2 mg) po TID prn

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

Consult a healthcare provider before administering.

Frequently Asked Questions (FAQ)

1. What is Clemastine used for?

Clemastine (Tavist; Tavegyl) treats allergic reactions, such as hay fever, hives, and other allergy symptoms.

2. How often is this given?

<6 years: Twice daily (BID) as needed (prn), 0.05 mg/kg/day (weight-based, selectable). 6-12 years: 0.5 mg po BID prn. Adults: 1 mg po BID prn, may increase to 2 mg po TID prn.

3. Can this be used for infants under 1 year?

Consult a doctor, as Clemastine is not typically recommended for infants under 1 year without medical supervision.

4. What if weight is in pounds?

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

5. What’s the adult dose?

Usual dose is 1 mg po BID prn, may be increased to 2 mg po TID prn.