A retrospective observational study of certain interactions with simvastatin 40 mg in an acute hospital in England.

The use of simvastatin 40 mg with various interacting medicines may lead to an increased risk of myopathy. We examined the extent to which hospital inpatients were prescribed simvastatin 40 mg with amiodarone, amlodipine, diltiazem, or verapamil, and assessed if any action was taken by prescribers or the pharmacy team to avoid this interaction. We found 56 patients on a combination of interest during their stay. Of the 20 (36%) patients not discharged on the combination, in six instances this was due to pharmacy intervention, while the remaining instances when simvastatin 40 mg or the interacting drug was amended or ceased were due to other clinical reasons. There is a need among clinicians and pharmacy teams within the hospital for recognition and management of these particular interactions.