Promethazine 5 mg/5 mL Dosage Calculator

Promethazine 5 mg/5 mL (Brand Name: Phenergan) Dosage Calculator

Patient's Weight:

Patient Age and Condition:

Promethazine 5 mg / 5 mL

Doses expressed in terms of Promethazine

How to Calculate Promethazine 5 mg/5 mL Dose

This calculator determines the Promethazine dose for treating allergies or motion sickness, using a concentration of Promethazine 5 mg/5 mL (1 mg/mL), based on the patient’s age, condition, and weight:

Dose in mL and mg (based on Promethazine):

Age 2 to 5 years (Allergies): 5 mL (5 mg) po twice daily, alternatively 5–15 mL (5–15 mg) po once daily at night

Age 2 to 5 years (Motion Sickness): 5 mL (5 mg) po the night before the journey, to be repeated after 6–8 hours PRN

Age 5 to 10 years (Allergies): 5 mL (5 mg) po twice daily, alternatively 5–25 mL (5–25 mg) po once daily at night

Age 5 to 10 years (Motion Sickness): 10 mL (10 mg) po the night before the journey, to be repeated after 6–8 hours PRN

Age >10 years and adults (Allergies): 10 mL (10 mg) po twice daily, alternatively 10–75 mL (10–75 mg) po once daily at night

Age >10 years and adults (Motion Sickness): 25 mL (25 mg) po the night before the journey, to be repeated after 6–8 hours PRN

Where:

Weight: Enter the patient’s weight in kilograms (kg) or pounds (lb) and select the unit from the dropdown (automatically converted to kg, though not used for dosing in this case).
Age and Condition: Select the patient’s age group and condition (allergies or motion sickness) from the dropdown.
Concentration: Promethazine 5 mg/5 mL (1 mg/mL).

Administer as prescribed for allergies or motion sickness. ⚠️ Always consult a healthcare provider.

Using the Promethazine 5 mg/5 mL Dosage Calculator

Enter the patient’s weight in kilograms or pounds, select the unit, choose the age group and condition (allergies or motion sickness), and click "Calculate." The calculator provides the dose in mL and mg (Promethazine) for the specified age and condition, ensuring the minimum dose (if applicable) is less than or equal to the maximum dose for allergies.

Example: Age >10 years and adults for motion sickness:

Age >10 years and adults (Motion Sickness):
25 mL (25 mg) po the night before the journey. To be repeated after 6–8 hours 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 Promethazine used for?

Promethazine (Phenergan) is used to treat allergies and motion sickness.

2. How often is this given?

For allergies: 5–75 mL (5–75 mg) po twice daily or once daily at night, depending on age. For motion sickness: 5–25 mL (5–25 mg) po the night before the journey, repeatable after 6–8 hours PRN, depending on age.

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

Consult a doctor, as Promethazine is not typically recommended for children under 2 years 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), though weight is not used for dosing in this case.

5. What’s the maximum daily dose?

The maximum daily dose varies by age and condition: up to 15 mg/day for ages 2–5 years, 25 mg/day for ages 5–10 years, and 75 mg/day for ages >10 years and adults for allergies; 10 mg/day for ages 2–5 years and 20 mg/day for ages 5–10 years for motion sickness, with 50 mg/day for >10 years and adults for motion sickness if repeated.