Nitrofurantoin 25 mg/5 mL Dosage Calculator

Nitrofurantoin 25 mg/5 mL Dosage Calculator (Brand Name: Macrobid; Macrodantin)

Patient's Weight:

Patient Age Group:

Nitrofurantoin 25 mg / 5 mL

Doses expressed in terms of Nitrofurantoin

5 to 7 mg/kg/day po QID (Max 400 mg/day)

Note: Does not apply if using Macrobid capsules

How to Calculate Nitrofurantoin 25 mg/5 mL Dose

This calculator determines the Nitrofurantoin dose for treating urinary tract infections, using a concentration of Nitrofurantoin 25 mg/5 mL (5 mg/mL), based on the patient’s weight and age group:

Dose in mL and mg (based on Nitrofurantoin):

Pediatric ≥ 1 month: 5 to 7 mg/kg/day po QID (Max 400 mg/day)

Adults: Usual dose is 50 to 100 mg PO QID (or 100 mg PO BID if using Macrobid capsules)

Where:

Weight: Enter the patient’s weight in kilograms (kg) or pounds (lb) and select the unit from the dropdown (automatically converted to kg).
Age Group: Select the appropriate age group (Pediatric ≥ 1 month or Adults).
Concentration: Nitrofurantoin 25 mg/5 mL (5 mg/mL).

Administer as prescribed for urinary tract infections. ⚠️ Note: Does not apply if using Macrobid capsules. Always consult a healthcare provider.

Using the Nitrofurantoin 25 mg/5 mL Dosage Calculator

Enter the patient’s weight in kilograms or pounds, select the unit, choose the age group, and click "Calculate." The calculator provides the dose in mL and mg (Nitrofurantoin) for pediatric and adult patients.

Example: Weight 10 kg, Pediatric ≥ 1 month:

Pediatric ≥ 1 month:
2.5 mL (13 mg) to 3.5 mL (18 mg) PO QID

Adults:
Usual dose is 10.0 mL (50 mg) to 20.0 mL (100 mg) PO QID (or 100 mg PO BID if using Macrobid capsules)

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

Consult a healthcare provider before administering, and ensure Macrobid capsules are not being used for this calculation.

Frequently Asked Questions (FAQ)

1. What is Nitrofurantoin used for?

Nitrofurantoin (Macrobid; Macrodantin) is used to treat urinary tract infections (UTIs).

2. How often is this given?

Pediatric ≥ 1 month: 5 to 7 mg/kg/day po QID (Max 400 mg/day). Adults: 50 to 100 mg PO QID (or 100 mg PO BID if using Macrobid capsules).

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

Consult a doctor, as Nitrofurantoin is not typically recommended for infants under 1 month 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 maximum daily dose for pediatric patients?

The maximum daily dose for pediatric patients (≥1 month) is 400 mg/day (7 mg/kg/day, capped at 400 mg).