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reason for b12 injections in cats Vitamin Deficiency Cats: The Basics Appetite Stimulant Vitamin B12 for
Description
One well-documented interaction is with certain anti-epileptic drugs: high-dose pyridoxine may reduce the plasma levels of phenytoin and phenobarbital by enhancing their hepatic metabolism, potentially diminishing their anticonvulsant efficacy

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This is anecdotal and practitioner-derived, not clinically validated

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