Accurate Pediatric Medication Dosage: Calculating Amoxicillin Syrup for UTI in a 3-Year-Old

When a healthcare provider orders amoxicillin syrup for a 3-year-old child with a urinary tract infection (UTI), precise medication dosage is crucial. Your pediatric assessment has provided essential data, including the child’s weight, height, and vital signs. The prescribed dosage is 50 mg/kg/day divided into three doses per day (TID). The available stock is an amoxicillin suspension with a concentration of 400 mg/5mL. In this article, we will guide you through the calculations required to determine the correct amount of amoxicillin syrup to administer per dose, ensuring the safe and effective treatment of UTI in a 3-year-old child.

Understanding Pediatric UTI and Treatment

Urinary tract infections (UTIs) in children are common and can cause discomfort and complications if left untreated. Amoxicillin is an antibiotic often used to treat UTIs by targeting the bacteria responsible for the infection.

The Role of Amoxicillin in Pediatric UTI Treatment

Amoxicillin is a widely used antibiotic in pediatric medicine. It belongs to the penicillin class of antibiotics and is effective against many bacterial infections, including UTIs.

Calculating the Pediatric Amoxicillin Dosage

To determine the amount of amoxicillin syrup to administer to the 3-year-old child, we need to perform a series of calculations. Here are the key steps:

  1. Calculate the Total Daily Dosage: The prescribed dosage is 50 mg per kilogram of the child’s weight per day, divided into three doses per day (TID). To calculate the total daily dosage, multiply the child’s weight in kilograms by 50 mg/kg.

    Total Daily Dosage (mg) = Child’s Weight (kg) x Dosage (mg/kg)

    Total Daily Dosage (mg) = 12 kg x 50 mg/kg = 600 mg/day

  2. Calculate the Amount per Dose: To determine the amount of amoxicillin syrup to administer per dose, divide the total daily dosage by the number of doses per day (TID).

    Amount per Dose (mg) = Total Daily Dosage (mg) / Number of Doses per Day

    Amount per Dose (mg) = 600 mg/day / 3 doses/day = 200 mg/dose

  3. Determine the Volume of Amoxicillin Syrup: To find the volume of amoxicillin syrup to administer, we need to know the concentration of the available suspension, which is 400 mg per 5 mL.
  4. Calculate the Volume per Dose: Divide the amount per dose (in mg) by the concentration of the suspension (in mg per mL) to find the volume of amoxicillin syrup to be administered per dose.

    Volume per Dose (mL) = Amount per Dose (mg) / Concentration of Suspension (mg/mL)

    Volume per Dose (mL) = 200 mg / 400 mg/5 mL = 2.5 mL

Given the concentration of the amoxicillin suspension, the nurse should administer 2.5 mL of amoxicillin syrup per dose to the 3-year-old child with a UTI.

Nurse’s Responsibilities in Pediatric Medication Administration

In pediatric medication administration, nurses play a critical role in ensuring the safe and effective treatment of young patients.

  1. Pediatric Assessment: Conduct a thorough assessment of the child’s condition, including vital signs, weight, height, and the severity of the UTI. Monitor for symptoms such as fever, pain, and changes in urination.
  2. Informed Consent: Ensure that the child’s caregiver understands the purpose and potential side effects of the medication. Obtain informed consent for treatment.
  3. Medication Preparation: Accurately prepare the medication, considering the prescribed dosage, concentration, and volume.
  4. Dosage Calculation: Calculate the precise dosage based on the child’s weight and the prescribed dosage per kilogram.
  5. Administration: Administer the medication via the appropriate route (in this case, oral) at the calculated dose.
  6. Monitoring: Continuously monitor the child’s response to treatment, vital signs, and any potential side effects. Adjust the treatment plan as needed.
  7. Documentation: Maintain precise and comprehensive documentation, noting the medication dosage, vital signs, and the child’s response to therapy. Accurate record-keeping is essential for the child’s ongoing care.


Accurate medication dosage is crucial in the treatment of pediatric UTIs. By following the steps outlined in this article, nurses can ensure that young patients receive the appropriate dosage of amoxicillin syrup, aiding in the effective management of UTIs and promoting their recovery. This meticulous approach is essential to providing optimal care for pediatric patients, ensuring their safety and well-being.


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