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Brazilian Journal of Pharmaceutical Sciences
On-line version ISSN 2175-9790
SILVA, Eliane Regina da; DIEDRICH, Denise; BOLZAN, Rodrigo Cordeiro and GIACOMELLI, Sandro Rogério. Toxicological and pharmacological evaluation of Discaria americana Gillies & Hook (Rhamnaceae) in mice. Braz. J. Pharm. Sci. [online]. 2012, vol.48, n.2, pp.273-280. ISSN 2175-9790. http://dx.doi.org/10.1590/S1984-82502012000200011.
Medicinal plants (e.g. Discaria americana) have been used by populations for centuries. However, popular use is not enough to validate these plants as safe and effective medicinal products. The present study sought to evaluate the acute and subacute toxicity as well as the anxiolytic and antinociceptive effects of D. americana root bark and aerial parts extracts in mice. In acute toxicity studies, mice were treated with single intraperitoneal doses of the aforementioned extracts. Subacute toxicity studies were performed by oral administration of the extracts over 14 days. Anxiolytic studies consisted of the elevated plus maze method, and antinociceptive studies were based on the hot plate test. The LD50 value for D. americana aerial parts extract was established at >500 mg/kg, and for the root bark extract, 400 mg/kg. D. americana aerial parts extract produced anxiolytic (250 mg/kg) and antinociceptive effects (125, 200 and 250 mg/kg). Conversely, D. americana root bark extract showed neither anxiolytic nor antinociceptive effects in mice.
Keywords : Discaria americana [phamacognosy]; Medicinal plants; Discaria americana [toxicological analysis]; Discaria americana [acute toxicity]; Discaria americana [subacute toxicity]; Discaria americana [anxiolytic effect]; Discaria americana [antinociceptive effect].