How to Calculate Dextromethorphan 15 mg/5 mL (suspension) Dose

This calculator determines the Dextromethorphan dose for treating cough, using a concentration of Dextromethorphan 15 mg/5 mL (3 mg/mL), based on the patient’s age group:

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

Volume Calculation:

Where:

• Age Group: Select the appropriate age group (4 to <6 years, 6 to <12 years, or ≥12 years and adults).
• Concentration: Dextromethorphan 3 mg/mL (15 mg/5 mL).

Administer as needed (prn) for cough symptoms, up to the maximum daily dose. ⚠️ Always consult a healthcare provider.

Using the Dextromethorphan 15 mg/5 mL (suspension) Dosage Calculator

Select the patient’s age group. The calculator provides the dose in mL and mg for the corresponding age group.

Example: Children 4 to <6 years:

Children 4 to <6 years:
2.5 mL (7.5 mg) po every 6 hours prn (Max 30 mg/day)

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

Consult a healthcare provider before administering.

Frequently Asked Questions (FAQ)

1. What is Dextromethorphan used for?

Dextromethorphan (Benylin DM; Robitussin DM; DM; Delsym; DexAlone; Duract) treats cough associated with colds or respiratory infections.

2. How often is this given?

Every 6 hours as needed (prn), with doses varying by age: 2.5 mL (7.5 mg) for 4 to <6 years (max 30 mg/day), 5 mL (15 mg) for 6 to <12 years (max 60 mg/day), and 10 mL (30 mg) for ≥12 years and adults (max 120 mg/day).

3. Can this be used for children under 4 years?

Consult a doctor, as Dextromethorphan is not typically recommended for children under 4 years without medical supervision.

4. What’s the adult dose?

Usual dose is 10 mL (30 mg) po every 6 hours prn (Max 120 mg/day).