Trimethoprim 10 mg / mL Dosage Calculator

How to Calculate Trimethoprim 10 mg / mL Dose

This calculator determines the Trimethoprim dose for treating urinary tract infections (UTIs), using a concentration of Trimethoprim 10 mg / mL, based on the patient’s weight:

Dose in mL and mg (based on Trimethoprim):

Pediatric ≥ 2 months: 4 to 6 mg/kg/day PO BID (Max 100 mg/dose)

Adults: Treatment: 100 mg PO BID; Prophylaxis: 100 mg PO daily

Where:

Weight: Enter the patient’s weight in kilograms (kg) or pounds (lb) and select the unit from the dropdown (automatically converted to kg).
Concentration: Trimethoprim 10 mg / mL.

Administer as prescribed for UTIs. ⚠️ Always consult a healthcare provider.

Using the Trimethoprim 10 mg / mL Dosage Calculator

Enter the patient’s weight in kilograms or pounds, select the unit, and click "Calculate." The calculator provides the dose in mL and mg for pediatric (≥2 months) and adult patients, ensuring the minimum dose (in both mL and mg) is less than or equal to the maximum dose for pediatric patients.

Example: Weight 10 kg:

Pediatric ≥ 2 months:
Min Dose: 2 mL (20 mg) PO BID
Max Dose: 3 mL (30 mg) PO BID

Adult Dose:
Treatment: 10 mL (100 mg) PO BID; Prophylaxis: 10 mL (100 mg) PO daily

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

Consult a healthcare provider before administering.

Frequently Asked Questions (FAQ)

1. What is Trimethoprim used for?

Trimethoprim (Primsol; Proloprim; Trimpex; TMP) is used to treat urinary tract infections (UTIs) and for prophylaxis against recurrent UTIs.

2. How often is this given?

Pediatric ≥ 2 months: 4 to 6 mg/kg/day PO BID (Max 100 mg/dose). Adults: Treatment: 100 mg PO BID; Prophylaxis: 100 mg PO daily.

3. Can this be used for infants under 2 months?

Consult a doctor, as Trimethoprim is not typically recommended for infants under 2 months 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 dose per administration for pediatric patients?

The maximum dose per administration for pediatric patients (≥2 months) is 100 mg (10 mL) PO BID.