Phytochemical, toxicological and histo-pathological studies were carried out on the leaves and stem bark extracts of Grewia mo/lis, Boswe//ia da/zie//ii, Jatropha curcas and Pterocerpus erinaceus claimed to be of medicinal values in Nigeria. The soxhlet apparatus was used for extraction of the crude materials. The result revealed the presence of tannins, saponins, flavonoids, glycosides, balsam, phenols, terpenes, steroids and the absence of alkaloids in Grewia mo/lis (bark), Boswe//ia da/zie//ii (leaf) and Pterocarpus erinaceus (bark) as well as cyanogenic glycosides in all the plant materials. Toxicological result showed that the plant is safe for human consumption but with caution having produce LDsoat 1500 mg/kg body weight. The extracts showed no structural effects on the liver and heart.dn'the kidney however, the convoluted tubules were filled with fluids, which suggested that the extract should be used with caution on patients with renal failure. The plants therefore possess some important biological activities that could be harnessed and employed beneficially in the management of viral and bacterial infections.
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