Summary

Irritability, aggression and other adverse behavioural effects have been associated with the use of statins (3-hydroxy-3-methyl-glutaryl-coenzyme A reductase inhibitors) and other drug classes. A number of studies have also linked low cholesterol with aggression and violence. This paper presents the cases of two first-degree male relative patients (father and son) identified by self-referral to the University of California in San Diego Statin Effects Study. Both patients experienced behavioural adverse effects on statins including irritability and aggression, however neither patient recognised a significant change in their behaviour. This may be the first report of behavioural adverse effects manifested on statins by first-degree male relatives, which may suggest possible familial/biological predisposition. These cases also highlight the issue of externalisation by patients of the origin of interpersonal discord, which may serve as an obstacle to adverse effects reporting and lead to negative outcomes for patients, and for those around them.