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Ingrid W. Reimann, MD, PhD; Ulrich Diener, PhD; Jügen C. Frölich, MD

Arch Gen Psychiatry. 1983;40(3):283-286.

Abstract
• The pharmacokinetic drug interactions between lithium sulfate and the nonsteroidal anti-inflammatory drugs (NSAIDs) indomethacin and aspirin were studied in ten normal female volunteers restricted to 150-mEq/day of sodium. Indomethacin decreased renal lithium ion elimination by 23% and caused a 40% increase in steady state plasma lithium ion levels. In contrast, aspirin had no effect on plasma lithium ion levels and increased renal lithium ion elimination by only 6%. Renal prostaglandin E₂ excretion was suppressed by 50% to 60% of control levels by indomethacin and by 65% to 70% by aspirin. A clinically important drug interaction with the risk of lithium intoxication can occur between lithium salts and indomethacin. However, aspirin did not affect steady state plasma levels of lithium ion and thus may be preferable for antirheumatic treatment of patients undergoing long-term therapy with lithium salts. Frequent monitoring of plasma lithium ion levels is absolutely necessary in patients receiving both lithium salts and NSAIDs.

Author Affiliations
From the Dr Margarete Fischer—Bosch Institute of Clinical Pharmacology (Drs Reimann and Frölich) and the Department of Clinical Chemistry, Robert-Bosch-Krankenhaus (Dr Diener), Stuttgart, West Germany.

Footnotes
Accepted for publication May 17, 1982.

Read in part before the annual meeting of the Deutsche Gesellschaft für Innere Medizin, April 27, 1981, Wiesbaden, West Germany.

Reprint requests to Dr Margarete Fischer—Bosch—Institut für Klinische Pharmakologie, Auerbachstrasse 112, 7000, Stuttgart 50, Germany (FRG) (Dr Reimann).

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