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14-day repeat-dose oral toxicity evaluation of oxazyme in rats and dogs.

Oxazyme (OC4) is an orally administered formulation that has as an active component a recombinant mutant form of Bacillus subtilis oxalate decarboxylase (OxDC) enzyme C383S, designed to degrade dietary oxalate in the stomach. Fourteen-day repeat-dose studies were conducted in rats and dogs to evaluate toxicity and determine a no observed adverse effect level (NOAEL). Animals were administered OC4 by oral gavage twice daily for 14 consecutive days. Reversibility, progression, and delayed appearance of any observed changes were evaluated in a subset of animals that underwent a recovery of 7 days following 14 days of control or test-article. There were no test-article-related adverse effects or deaths in either species. Results indicate that the NOAEL under the conditions used in the studies was 720.8 mg/kg/d in rats and 187.2 mg/kg/d in dogs, the high dose tested in each species.

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