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Background: Drug-related problems (DRPs) are common among elderly patients with dementia. STOPP/START is an explicit tool that has been used to detect DRPs among elderly patients.

Objectives: The objective of this study was to compare prevalence and type of DRPs identified by STOPP/START with DRPs identified by clinical pharmacists among the same population. Secondary objectives were to investigate factors associated with the use of DRPs using the two methods.

Method: Extracts from medical records were used to identify DRPs in 212 patients by using STOPP/START. The patients were ≥65 years of age with dementia or cognitive impairment. An earlier study was performed in the same study population in 2012–2014, where DRPs were identified by clinical pharmacists in order to decrease the number of rehospitalizations.

Results: STOPP/START identified DRPs in 72.2% of the patients compared with 66.0% identified by the clinical pharmacists. The numbers of DRPs identified by the different methods were 326 and 310, respectively. Different types of DRPs were identified with the different tools. STOPP/START mainly identified DRPs in the categories “ineffective/inappropriate drug” and “needs additional drug therapy”, whereas the clinical pharmacists identified DRPs in several categories.

Conclusion: Even though STOPP/START was able to identify a similar number of DRPs compared with DRPs identified by clinical pharmacists, STOPP/START failed to identify DRPs in several important categories. To cover all DRPs, STOPP/START might be used as a complement to implicit criteria.