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The Combination of Lithium and ACE Inhibitors: Hazardous, Critical, Possible?
Leif Hommers1,2,3, Matthias Fischer1, Christine Reif-Leonhard4
1Department of Psychiatry, Psychosomatics and Psychotherapy, Center for Mental Health, University Hospital of Würzburg, Margarete-Höppel-Platz 1, 97080, Würzburg, Germany.
Insights
Combining lithium with angiotensin-converting enzyme (ACE) inhibitors is possible for bipolar disorder patients with hypertension. Careful monitoring and avoiding hydrochlorothiazide are key to preventing lithium intoxication.
Area of Science:
- Pharmacology
- Nephrology
- Psychiatry
Background:
- Lithium is a primary treatment for mood disorders.
- Angiotensin-converting enzyme (ACE) inhibitors are widely used for cardiovascular conditions.
- Concurrent use of lithium and ACE inhibitors is cautioned due to potential lithium toxicity.
Observation:
- Three cases examined lithium use with enalapril, lisinopril, or ramipril.
- Lithium intoxication was linked to hydrochlorothiazide co-medication or dehydration, not ACE inhibitors alone.
Findings:
- ACE inhibitors can be safely combined with lithium.
- Avoiding hydrochlorothiazide and maintaining hydration are key to preventing lithium toxicity.
- Regular monitoring of lithium levels is recommended.
Implications:
- This suggests a safer approach to managing co-existing conditions in patients on lithium.
- Clinical practice can consider lithium-ACE inhibitor combinations under specific conditions.
- Further research into drug interactions and patient monitoring is warranted.
Abstract:
Lithium is a well established therapeutic agent in the treatment of uni- and bipolar affective disorders. Angiotensin-converting enzyme (ACE) inhibitors are the most frequently used class of drugs in the treatment of cardiovascular diseases. Combination therapy with both may be considered in clinical practice on occurrence of arterial hypertension after years of successful lithium therapy, yet an increased risk of lithium intoxication in combination with ACE inhibitors has been described and thus the combination has been warned against. We describe three cases in which enalapril, lisinopril or ramipril was combined with lithium. Either additional co-medication with hydrochlorothiazide or dehydration rather than co-medication with ACE inhibitors could be identified as necessary factors for lithium intoxication. These cases suggest that a combination of lithium with ACE inhibitors is possible when sufficient hydration is ensured and a combination with hydrochlorothiazide is avoided. Lithium concentration should be controlled on a regular level.
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