Journal
INTERNATIONAL JOURNAL OF ANTIMICROBIAL AGENTS
Volume 14, Issue 3, Pages 261-265Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/S0924-8579(99)00163-6
Keywords
vitamin K; heterocyclic compounds; antimicrobials; psychotropes; antimalarials; antibiotics; anticoagulants; charge transfer complexes; alternating current titrations
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The charge transfer donor (D)-acceptor (A) complexes formed between three classes of vitamin K (all electron accepters in this study) with several thiazine psychotropes, used also as antimicrobials, antimalarials, antibiotics, and anticoagulants, were studied by means of alternating current titrations. The monochloride thiazines formed 2:1 (D:A) complexes, interacting from 26 to 47.5%; the dihydrochloride formed a 3:1 (D:A) complex. The antimalarials quinine and its isomer quinidine yielded 2:1 (D:A) complexes, interacting 51 and 60%, respectively. Quinacrine did not complex with vitamin K. The antibiotics sulfisoxasole and sulfamethisole gave 1:1 complexes, respectively interacting 6.2 and 11.7%. The anticoagulants warfarin, coumarin and dicumarol, rather than forming complexes proceeded rapidly to chemical reaction. When the above thiazine antimicrobials, antimalarials and antibiotics are present in patients receiving vitamin K post-operatively the dosage of administered vitamin K should be increased to counteract the donor-acceptor interaction effect. (C) 2000 Elsevier Science B.V. and International Society of Chemotherapy. All rights reserved.
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