Obesity Drug Dosage Calculator
Calculate appropriate drug doses for obese patients using IBW, ABW, LBM, or TBW based on drug properties.
Patient Information
Drug Parameters
mg/kg
Calculated Dose (ABW)
875.6 mg
BMI: 41.5 - Obesity Class III
⚖️Total Body Weight
120.0 kg
🎯Ideal Body Weight
65.9 kg
📊Adjusted Body Weight
87.6 kg
💪Lean Body Mass
75.0 kg
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 m²
% 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 |