Geriatric Dosing Calculator
Calculate age-appropriate medication doses for elderly patients considering renal function, frailty, and drug interactions.
Patient Information
years
mg/dL
Polypharmacy: 5+ medications
Drug Information
mg
Recommended Dose
283 mg
43% reduction from adult dose
🔬CrCl
45 mL/min
🎯Starting Dose
142 mg
💊Polypharmacy Risk
Moderate
📊Dose Factor
57%
Start Low, Go Slow
Consider starting at 142 mg and titrating up based on response and tolerability.
Recommendation
Moderate risk: Start at 50% of normal dose, monitor closely
Polypharmacy Alert
Patient is on 5 medications. Review for drug interactions and deprescribing opportunities.
Geriatric Prescribing Principles
Physiological Changes
- Decreased renal function (GFR falls 1%/year after 40)
- Reduced hepatic blood flow and metabolism
- Increased body fat, decreased lean mass
- Reduced albumin (less protein binding)
- Increased CNS sensitivity
Prescribing Tips
- Start low, go slow
- Review Beers Criteria for PIMs
- Minimize polypharmacy
- Regular medication review
- Consider deprescribing