JOURNAL ARTICLE

Adsorption of mexiletine onto activated charcoal in macrogol-electrolyte solution

K Arimori, M Deshimaru, E Furukawa, M Nakano
Chemical & Pharmaceutical Bulletin 1993, 41 (4): 766-8
8508478
Adsorption studies in vitro of mexiletine onto activated charcoal were performed in macrogol (polyethylene glycol)-electrolyte solution (PEG-ELS) and JP XII disintegration medium No. 2 (second medium). Mexiletine was adsorbed more extensively onto activated charcoal in PEG-ELS than that in JP XII second medium. The maximum adsorptive capacity of activated charcoal for the drug was 328 and 284 mg per gram of charcoal in PEG-ELS and JP XII second medium, respectively. In addition, the equilibrium constant of activated charcoal estimated according to the Langmuir equation was 0.079 and 0.034 l per gram of charcoal in PEG-ELS and JP XII second medium, respectively. Adsorption of mexiletine onto activated charcoal was decreased by omitting macrogol, sodium sulfate or sodium bicarbonate from a standard PEG-ELS formulation. Oral activated charcoal will be useful in combination with whole bowel irrigation with PEG-ELS in mexiletine overdose because of its excellent adsorbability in the solution.

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