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This study is designed to evaluate the analgesic and anti-inflammatory activities of aqueous extract (AE) of Cistus ladanifer L. leaves in experimental animal models. The central analgesic activity of C. ladanifer AE is studied using hot plate method in rats, and the acute anti-Inflammatory activity of C. ladanifer is investigated by rats paw edema induced by subplantar injection of 0.5% carrageenan into the right hind paw. Rats are pretreated with AE of C. ladanifer at different doses (150, 175, and 200 mg/kg, i.p.). The tramadol and indomethacin are used as reference drugs for analgesic and anti-inflammatory studies, respectively. Our results show that the AE of C. ladanifer exhibited anti-inflammatory and analgesic effects dose dependent. In anti-inflammatory activity, the AE of C. ladanifer at all doses reduced significantly the edema paw inflammation after carrageenan injection. Furthermore at 200 mg/kg, the effect of AE is highly important than that of other doses. In addition, the same AE demonstrates significant analgesic effect in thermal-induced pain model. So, this activity is proved by significant reduction of pain score after administration of AE at all doses. The nociception protection effects in this case are, respectively, 70.3%, 74.55%, and 93.33% after administration of AE of C. ladanifer at doses 150, 175, and 200 mg/kg b.w. The results of our findings suggest that AE of C. ladanifer has potential analgesic and anti-inflammatory activities with evidence of possible involvement of peripheral and central effects in its actions.

In this work, we characterized by high-performance liquid chromatography, the γ-tocopherol (573.66 μg/g), and by gas chromatography-mass spectrometry, the linoleic acid (62.05%) as major components from Peganum harmala L. seeds oil and evaluated their potential in vivo acute antiinflammatory, analgesic activities, and in vitro antioxidative capacity. The 2,2-Diphenyl-1-picrylhydrazyl (DPPH) radical scavenging assay showed an important antioxidant activity (62.50% with an IC50 of 4.8 mg/mL). In addition, the antiinflammatory effect of the formulation cream at 20% caused a reduction in inflammation at 5 hours after carrageenan application compared with diclofenac at 1% (60.4%; 45.65%; respectively). A slight potential peripheral analgesia was noted in plantar test in treated rats with cream (20 s). Therefore, our findings demonstrate that formulation cream of P. harmala seeds oil has an interesting antiinflammatory activity with a slight peripheral analgesic effect due mainly to its richness on linoleic acid, γ-tocopherol, and polyphenols and to its important antioxidant capacity.