Caffeine consumption among adults on benzodiazepine therapy: United States 1988-1994

The concomitant use of benzodiazepines and caffeine was studied to learn if caffeine consumption varied as a function of benzodiazepine use. Caffeine may antagonize the effects of benzodiazepine and even relatively small amounts can aggravate symptoms associated with anxiety disorders. In addition, caffeine can cause or aggravate insomnia, one of the main reasons cited for use by the subjects in this analysis. Given this, there would seem to be sufficient reason for at least some users of benzodiazepines to consider, with their physicians, avoiding or limiting caffeine consumption. Data from the Third National Health and Nutrition Examination Survey were analyzed to obtain a nationally representative sample of benzodiazepine users. Subjects included 253 individuals (64% women) whose median age was 54 yr. Approximately 88% of benzodiazepine users reported caffeine consumption in the 24-hr. Dietary Recall. 26% of benzodiazepine users and 23% of nonusers reported consuming greater than 250 mg of caffeine during the 24-hr. reference period. In regression analyses, no significant relationships were found between reported caffeine consumption and benzodiazepine use. This study suggests that users and nonusers of benzodiazepines ingest similar amounts of caffeine even though some users should probably avoid or limit caffeine use.