OPTIMA-ID: development and validation of a medicine optimization tool for older adults with intellectual disability.

Background: Older people (i.e. ≥40 years) with intellectual disability have unique medication needs and may experience high levels of potentially inappropriate prescribing. Despite the availability of tools to optimize older adults' prescriptions, there is no comprehensive tool specifically for use in older adults with intellectual disability. We aimed to develop a tool for this purpose: Optimizing Pharmaco-Therapy and Improving Medication for Ageing with Intellectual Disability (OPTIMA-ID).

Research design and methods: A draft tool was developed based on literature review and clinical expertise. Focus groups with healthcare professionals and people with intellectual disability were conducted to refine the tool. The tool was presented electronically to an expert panel for Delphi validation. Median level of agreement and 75^th percentile values were used to establish if consensus was reached. Criteria were accepted, rejected, revised or removed to develop the final tool.

Results: Following two Delphi rounds, consensus on the content of OPTIMA-ID was reached for 67 prescribing criteria, 63 of which were agreed upon after Round 1 and a further 4 criteria accepted after Round 2.

Conclusions: OPTIMA-ID contains 67 criteria that can optimize medications for older people with intellectual disability. Its effectiveness, feasibility and impact on patient outcomes need to be established.