Indomethacin pediatric dose calculator
Use this Indomethacin pediatric dose calculator to match the prescribed child dose to the exact liquid, tablet, or capsule strength before you give it.
dose calculator basics
Indomethacin pediatric dose calculator details
Use this Indomethacin calculator as the fast parent page for weight-based dose checks, mL conversion, common strengths, and the practical safety steps that generic calculator sites often skip.
Formula
mL per dose = (child weight in kg x prescribed mg/kg/day / doses per day) / medication concentration in mg per mL.
Worked example
For a 20 kg child using 1 mg/kg/day divided 2 times daily with 25 mg/5 mL, calculate the daily mg target, divide by the schedule, then convert that mg amount into mL for the selected product.
Safety checks before using the result
- Use the exact product strength in hand before measuring the dose.
- Confirm maximum dose, age limits, and indication-specific cautions when they apply.
- Escalate urgent symptoms or medication reactions instead of repeating doses from calculator output alone.
Practical dosing guide
Before you measure the dose
Use this page to turn the prescribed Indomethacin plan into an exact child dose and double-check the strength in hand before you give it.
- What it helps with
- Indomethacin is a potent NSAID used for PDA closure, rheumatologic flares, and specific inflammatory conditions under specialist guidance.
- Common forms
- Common forms include 25 mg/5 mL suspension, 25 mg capsule, and 50 mg capsule.
- How often it is usually given
- These doses are usually spaced in divided doses, depending on the reason it was prescribed.
Indomethacin pediatric medication summary
Indomethacin is a potent NSAID used for PDA closure, rheumatologic flares, and specific inflammatory conditions under specialist guidance.
Obtain baseline labs (CBC, CMP with creatinine and liver enzymes) and blood pressure before initiating therapy; repeat frequently during titration.
Administer with food or milk and pair with gastroprotection for high-risk patients (steroids, ulcer history, systemic illness).
Indomethacin indications and common pediatric uses
Indomethacin is reserved for situations where strong prostaglandin suppression changes outcomes, such as PDA closure or refractory inflammatory disease, and should be used with explicit reassessment checkpoints.
Patent ductus arteriosus (PDA) closure
Patent ductus arteriosus (PDA) closure: Consider acetaminophen or surgical closure if response is incomplete.
Juvenile idiopathic arthritis (JIA) flare
Juvenile idiopathic arthritis (JIA) flare: Pair with gastroprotection for chronic use.
Bartter syndrome symptomatic control
Bartter syndrome symptomatic control: Provide sick-day rules to caregivers.
Pericarditis or serositis refractory to ibuprofen
Pericarditis or serositis refractory to ibuprofen: Avoid abrupt discontinuation to reduce rebound inflammation.
Hemicrania continua or refractory migraine
Hemicrania continua or refractory migraine: Stop immediately for severe adverse effects.
How to give Indomethacin
- Focused administration guidance for pediatric indomethacin.
- Confirm the indication and dosing protocol, shake suspensions for 10 seconds, and measure with an oral syringe at eye level. Tablets/capsules must be swallowed whole with water. Administer during or immediately after a meal/high-fat snack and ensure the child is well hydrated. For NICU PDA dosing, follow gestational age–specific order sets, monitor heart rate, blood pressure, urine output, and obtain labs between doses. Hold doses during vomiting/diarrhea or when creatinine rises ≥0.3 mg/dL.
Indomethacin side effects, contraindications, and interactions
Indomethacin is a high-potency NSAID with meaningful GI, renal, hematologic, and neurologic risk when monitoring is inconsistent. Most children tolerate short, well-supervised courses, but bleeding signs, reduced urine output, severe neurologic changes, or breathing/swelling reactions require immediate action.
Common side effects
- Always administer with food or milk to limit dyspepsia and mucosal irritation.
- Hold doses during vomiting, diarrhea, or poor intake to prevent dehydration-related kidney injury.
- Obtain baseline and periodic CBC, CMP, and blood pressure measurements for courses lasting more than 7–10 days.
Safety checks
- History of NSAID-induced anaphylaxis or aspirin-exacerbated respiratory disease
- Active gastrointestinal bleeding, peptic ulcer, or perforation
- Neonatal NEC or severe renal impairment (urine output <1 mL/kg/hr) during PDA therapy
- Third-trimester pregnancy (risk of ductal constriction and oligohydramnios)
- Baseline renal insufficiency or rising creatinine
- Hepatic dysfunction or transaminases >2× upper limit
Drug interactions
- Review the full medication list with a clinician or pharmacist before combining therapies.
Indomethacin mechanism and clinical pearls
Indomethacin is a potent nonselective cyclooxygenase inhibitor that lowers prostaglandin synthesis. COX-1 and COX-2 suppression drives anti-inflammatory benefit and supports neonatal ductal constriction for PDA therapy, but the same mechanism can reduce renal perfusion and gastric protection. That efficacy-to-toxicity coupling is why hydration status, renal trend, and GI symptom surveillance are core to safe pediatric use.
Obtain serum creatinine, BUN, AST/ALT, and platelet count before therapy and reassess within 48 hours for NICU courses or multi-day outpatient regimens. Rising creatinine >0.3 mg/dL or platelets <100k warrants holding the next dose.
For adolescents on >3–5 days or high-dose therapy, prescribe a proton pump inhibitor and counsel on warning signs of GI bleeding (coffee-ground emesis, melena).
Ensure maintenance fluids are adequate and avoid concurrent nephrotoxic agents (aminoglycosides, ACE inhibitors). Instruct families to pause indomethacin during vomiting illnesses and call for guidance.
Typical pediatric regimens are 1–2 mg/kg/day divided every 8–12 hours (label max 3 mg/kg/day or 150–200 mg/day, whichever is less) for up to 7–10 days; 25–50 mg per dose applies only to adult-size adolescents. Write the stop date in the chart and on the prescription so no one continues indefinitely.
NICU PDA regimens now prefer standardized order sets with mandatory pre/post labs to cut AKI.
Frequently asked questions about Indomethacin
Indomethacin is stronger at blocking prostaglandins. It is used when the ductus arteriosus needs to close, when other NSAIDs fail to control inflammation, or when specific conditions (Bartter syndrome, pericarditis) respond better to a potent NSAID.
Always give indomethacin with food or milk. Use the oral syringe for liquid doses, write each dose on a log, and never exceed the schedule your clinician provided. If a dose is missed and it is almost time for the next one, skip it—do not double up.
Your clinician will order blood tests (kidney function, liver enzymes, complete blood count) and sometimes a urine test before starting and during therapy. Expect more frequent labs during the first few weeks or if the dose changes.
Yes, but monitor for dizziness, headache, or stomach pain. Encourage hydration before practice and remind coaches that your child is on a medicine that can cause drowsiness or stomach upset.
Call immediately for vomiting blood, black stools, severe abdominal pain, sudden severe headache, confusion, mood changes, or reduced urine output. These may indicate GI bleeding, CNS effects, or kidney problems.
Hold the medicine and contact your care team if your child is vomiting, has diarrhea, or is not drinking well. Dehydration increases renal risk.
Follow the taper or stop plan provided by your specialist. Do not stop abruptly for chronic conditions without guidance, but discontinue immediately and seek care if severe side effects occur.
Sources reviewed for Indomethacin
jpeds-pda-2023
dailymed-indomethacin-2024
rmdopen-jia-2022
acr-indomethacin-guide-2021
semperi-bartter-2023
statpearls-bartter-2024