Tropical Journal of Pharmaceutical Research
Pharmacotherapy Group, Faculty of Pharmacy, University of Benin, Benin City, Nigeria
Vol. 13, No. 11, 2014, pp. 1863-1866
Bioline Code: pr14256
Full paper language: English
Document type: Research Article
Document available free of charge
Tropical Journal of Pharmaceutical Research, Vol. 13, No. 11, 2014, pp. 1863-1866
© 2014 - Tropical Journal of Pharmaceutical Research
Pharmacological Evidence of Hypotensive Activity of Somina (Herbal drug) in Normotensive Rats|
Azmat, A. & Ahmed, M.
Purpose: To evaluate the effects of somina (herbal drug) on the arterial blood pressure.
Methods: Hypotensive activity was studied in pentothal sodium-anesthetized normotensive albino rats
at various doses of somina (5, 10, 15, 20 and 35 mg/kg). The drugs were administered intravenously
and changes in arterial blood pressure (systolic, diastolic and mean arterial blood pressure) were
registered directly from the carotid artery. Acetylcholine (Ach, 10-4 M) was used as positive control for
comparison while the receptor activity of Ach and somina was assessed using atropine (muscarinic
receptor antagonist) on rat heart.
Results: Somina caused dose-dependent significant (p < 0.05) reduction in mean arterial pressure
blood pressure (MABP). The 35 mg/kg dose caused 46.7 % fall in MABP, which was significant (p <
0.05) when compared with control. The results were comparable with those of acetylcholine (10-4 M)
which showed 45.6 % fall in MABP. For receptor activity, atropine (10-4 M) was administered i.v., and
then the Ach and somina (45 mg/kg) was administered one at a time. Non-significant fall in MABP was
observed (1.2 and 20 %, p > 0.05) in rats that were pretreated with atropine.
Conclusion: Somina possesses potent hypotensive effect at different doses in normal rats by
stimulating non-selective muscarinic receptors.
Somina; Acetylcholine; Atropine; Herbal drug; Blood pressure; Hypotension activity; Muscarinic receptor; Vascular relaxant activity
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