Variant angina associated with bitter orange in a dietary supplement.

The Food and Drug Administration has banned the sale of ephedrine-based weight-loss products because of their association with many cardiovascular adverse effects. Bitter orange is now being used as a stimulant in "ephedra-free" weight-loss supplements but was recently implicated in adverse cardiovascular sequelae. To our knowledge, this report describes the first case of variant angina associated with bitter orange in a dietary supplement.