Obesity Drug Dosage Calculator
Calculate appropriate drug doses for obese patients using IBW, ABW, LBM, or TBW based on drug properties.
Important Health Disclaimer
This calculator provides general health information based on standard medical formulas and WHO guidelines. Results are for informational and educational purposes only and should not be considered as professional medical advice, diagnosis, or treatment recommendations.
For health concerns, medical conditions, fitness plans, or dietary decisions, please consult with qualified healthcare professionals, licensed physicians, registered dietitians, or certified fitness trainers who can evaluate your individual health status and medical history.
Individual health needs vary significantly. These calculations are general estimates and may not be appropriate for everyone, especially those with existing medical conditions, pregnant women, children, or elderly individuals.
Not a substitute for professional medical advice
Patient Information
Drug Parameters
Calculated Dose (ABW)
875.6 mg
BMI: 41.5 - Obesity Class III
Dose by Weight Basis
By TBW (120.0 kg): 1200.0 mg
By IBW (65.9 kg): 659.4 mg
By ABW (87.6 kg): 875.6 mg
By LBM (75.0 kg): 750.3 mg
Body Composition
Fat Mass: 45.0 kg (37.5%)
BSA: 2.38 mΒ²
% Above IBW: 82.0%
Recommendation
Moderately lipophilic drugs, use Adjusted Body Weight. Consider using 87.6 kg for dose: 875.6 mg
Clinical Note
Weight selection depends on drug properties. Consult drug-specific guidelines for optimal dosing in obese patients. Maximum dose caps may apply.
Weight Basis Selection Guide
| Drug Type | Recommended Weight | Examples |
|---|---|---|
| Hydrophilic | IBW or ABW | Aminoglycosides (use ABW) |
| Moderate Lipophilicity | ABW | Vancomycin, fluoroquinolones |
| Lipophilic | TBW (with cap) | Benzodiazepines, propofol |
| Low Molecular Weight Heparin | TBW (cap at 150 kg) | Enoxaparin |
| Chemotherapy | Actual weight (BSA) | Most cytotoxic agents |
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sources
- β’World Health Organization (WHO) β Global health metrics, disease classification, and nutritional standards. who.int
- β’Centers for Disease Control and Prevention (CDC) β Health statistics, BMI guidelines, and disease prevention data. cdc.gov
- β’National Institutes of Health (NIH) β Medical research, clinical guidelines, and health calculators. nih.gov
- β’Mayo Clinic β Clinical health information, disease reference, and wellness guidance. mayoclinic.org
For a complete list of all references used across the site, visit our full sources page.
Editorial Note
MyCalcBuddy Editorial Team
This page is maintained as an educational calculator reference.
Formula Source: WHO Health Metrics Standards
by World Health Organization