What is the Drug Burden Index?

The Drug Burden Index (DBI) is a pharmacological score that quantifies cumulative exposure to sedative and anticholinergic drugs. Each drug contributes D / (D + D50) to the total, where D is the daily dose and D50 is the minimum effective dose. A higher score indicates greater exposure and higher risk of adverse outcomes such as falls, cognitive impairment, and functional decline in older adults.

What is a clinically significant DBI score?

A DBI score of 1.0 or above is generally considered clinically significant and associated with increased risk of falls, sedation, and cognitive effects. Some studies use a threshold of 0.5 for moderate concern. Lower is better — ideally the DBI should be as close to 0 as possible.

Where do I find the minimum effective dose (D50)?

The D50 values are published in pharmacological reference tables. Key values used in the original Hilmer et al. (2007) paper include: oxybutynin 5 mg, amitriptyline 25 mg, diazepam 5 mg, lorazepam 0.5 mg, and zopiclone 7.5 mg, among others. Consult validated DBI reference tables for a full list.

Does DBI apply to all patients?

DBI was developed and validated primarily for older adults (typically ≥ 65 years) and is most relevant when assessing falls risk, functional decline, or cognitive burden. It is not intended as a general prescribing tool for younger populations.

Can I include non-sedative, non-anticholinergic drugs?

No. The DBI formula only applies to drugs with established sedative or anticholinergic properties. Other medications — even those with adverse effect profiles — are not included in the DBI calculation.

Drug Burden Index Calculator

Name: Drug Burden Index Calculator
Availability: InStock
Author: Nham Vu

Calculate the Drug Burden Index (DBI) to quantify cumulative sedative and anticholinergic medication load in elderly patients.

Add Medication

Only sedative and anticholinergic drugs contribute to DBI.

Drug name

Drug type

Daily dose (D)

Min. effective (D50)

Common D50 reference values

Oxybutynin (anticholinergic)5 mg

Amitriptyline (anticholinergic)25 mg

Paroxetine (anticholinergic)20 mg

Diazepam (sedative)5 mg

Lorazepam (sedative)0.5 mg

Zopiclone (sedative)7.5 mg

Temazepam (sedative)10 mg

Haloperidol (sedative)1 mg

Total Drug Burden Index

0.00

No drugs added

Anticholinergic burden

0.00

Sedative burden

0.00

Medication List

Add a medication to begin.

Drug	Type	D	D50	Contribution

Interpretation Guide

DBI < 0.5 Low burden — minimal sedative/anticholinergic exposure. Continue monitoring.

0.5 – 0.99 Moderate burden — consider reviewing necessity and dose reduction where clinically appropriate.

DBI ≥ 1.0 High burden — associated with increased risk of falls, cognitive impairment, and functional decline. Deprescribing review recommended.

Formula: DBI = ∑ D / (D + D₅₀). Reference: Hilmer SN et al., J Clin Pharmacol 2007.

Summary

Calculate the Drug Burden Index (DBI) to quantify cumulative sedative and anticholinergic medication load in elderly patients.

How it works

Select the drug type (sedative or anticholinergic) for each medication.
Enter the daily dose the patient is taking (D).
Enter the minimum effective dose for that drug (D50).
The tool computes each drug's contribution as D / (D + D50).
Individual contributions are summed to produce the total DBI score.
A DBI ≥ 1 suggests clinically significant pharmacological burden.

Use cases

Screen elderly patients for high anticholinergic or sedative drug burden during medication review.
Assist pharmacists in identifying candidates for deprescribing interventions.
Support geriatricians in falls-risk assessment linked to polypharmacy.
Compare DBI before and after medication optimization.
Educate students and trainees on how drug dose contributes to cumulative burden.

Frequently Asked Questions

Last updated: 2026-07-23 · Reviewed by Nham Vu