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Ellen F. Binder, MD; Lillibeth Cayabyab; David J. Ritchie, PharmD; Stanley J. Birge, MD

Arch Intern Med. 1991;151(2):373-374.

Abstract
Calcium channel blockers are being used increasingly for a variety of cardiovascular problems. Diltiazem hydrochloride, a benzothiazepine derivative, has been reported to have a low incidence of adverse side effects. We report a case of acute psychosis associated with the use of diltiazem in a patient receiving lithium carbonate therapy. Both diltiazem hydrochloride and lithium carbonate have calcium antagonist effects in the central nervous system, and we review their mechanisms of action. A possible synergistic drug interaction between diltiazem and lithium is reported.

(Arch Intern Med. 1991;151:373-374)

Author Affiliations
From the Department of Internal Medicine, Program on Aging, Washington University School of Medicine, St Louis, Mo (Drs Binder and Birge); University of Missouri School of Medicine, Columbia (Ms Cayabyab); Clinical Pharmacy, Jewish Hospital of St Louis (Mo) (Dr Ritchie); and the Department of Pharmacy Practice, St Louis (Mo) College of Pharmacy (Dr Ritchie).

Footnotes
Accepted for publication April 4, 1990.

Reprints not available.

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