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The effect of ibuprofen on steady-state lithium plasma and red blood cell concentrations was studied in 11 normal volunteers. During the seven-day control phase, sustained-release lithium carbonate 450 mg was administered every 12 hours. Lithium plasma and red blood cell concentrations were determined on days 5, 6, and 7. During the treatment phase (days 7-15), ibuprofen 400 mg was administered four times a day concurrently with lithium. Lithium plasma and red blood cell concentrations were obtained on days 14, 15, and 16. Multiple blood samples were obtained over a 12-hour period on days 6 and 15. Urine samples were collected from six subjects. The mean minimum lithium concentration increased 15% when ibuprofen was added. Mean maximum lithium concentration, area under the curve, red blood cell concentrations, and the lithium red blood cell to plasma ratio were significantly higher during the treatment phase. Mean lithium total body and renal clearance values were significantly lower during the treatment with ibuprofen. The administration of ibuprofen can increase steady-state plasma lithium concentrations and decrease lithium clearance.
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