Possible heart failure exacerbation associated with pregabalin: case discussion and literature review.

Pregabalin is an analog of the neurotransmitter gamma-aminobutyric acid that exhibits analgesic, anticonvulsant, and anxiolytic properties. Owing to its pharmacologic properties, the drug has been used worldwide in the management of diabetic peripheral neuropathy, postherpetic neuralgia, generalized anxiety disorder, and social anxiety disorder. Although central nervous system disturbances account for the majority of pregabalin's side effects, dose-dependent peripheral edema and weight gain have also been reported. Recently, three case reports have been published documenting a possible association between pregabalin administration and chronic heart failure decompensation. We present three additional cases of possible heart failure exacerbation in patients with clinically stable heart failure who received pregabalin for neuropathic pain. Additionally, we review the literature addressing the nature and possible etiology for this adverse effect.