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Abstract Background Chinese medicine often targets more than one system and as such comprises several compounds, often in non-purified form, with treatments therefore consisting of whole extracts of herbs rather than isolated compounds. The additive and synergistic effects of the phytochemicals in OMN54, a novel mixture of extracts from three commonly used Chinese medicine components; <it>Ganoderma lucidum</it>, <it>Salvia miltiorrhiza </it>and <it>Scutellaria barbata</it>, were previously demonstrated to have potent anti-cancer activity. This study aims to test whether this heterogeneous, multifunctional and multitargeted agent has an acceptable toxicity profile. Methods We conducted preliminary and formal preclinical tolerability determination of OMN54 in Sprague-Dawley rats. In the preliminary study rats were given OMN54 by oral feeding daily for 14 days at doses of 1000 mg/kg, 1750 mg/kg, 2500 mg/kg or 3000 mg/kg per day. A subsequent daily dosing (x 28, 60, 120 or 180) formal toxicology study was conducted in male and female Sprague-Dawley rats at a dose of single dose of 2000 mg/kg/day. Results Significant body weight loss was noted in one of the rats treated at 3000 mg/kg/day, with decline beginning study day 11. This animal experienced mild GI toxicity in the form of diarrhoea. Gross observation indicated kidney damage (pale kidneys) in both this group and in one rat treated at 2500 mg/kg/day. For the later studies, no body weight loss was noted over the course of the study. Blood counts and chemistry were not substantially altered following administration of OMN54, nor were there any findings on histological assessment of organs. Conclusion OMN54 was found to be well tolerated in rat models. OMN54 did not cause any microscopic, anatomic or pathologic changes in exposed animals at the concentrations and under the conditions employed in this study.</p

A novel combination of Chinese medicines to treat advanced cancers and lymphomas in rats