Treatment with a combination of 10 mg/kg i.p. methotrexate and 100 mg/kg i.p. nicotinamide inhibits the development of collagen II induced arthritis in male DBA/1 X B.10(4R) mice, as assessed by the arthritic index and whole blood chemiluminescence. The effect is much more pronounced than with either methotrexate or nicotinamide alone at the same concentrations. Determination of GOT and GPT levels in the blood revealed that the treatment causes no toxic side effects on the liver.
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