AbstractThe pharmacological activity of several extracts together with the lyophilized infusion ofS. chamaecyparissusssp.squarrosawere investigated. The lethal dose 50% (LD50), effect on animal metabolism, mechanical and thermic analgesia and spontaneous, anti‐inflammatory, and anti‐ulcer activity have been determined. Studies on isolated organs (rat duodenum and rat uterus) were also carried out. The hexanic and chloroformic extracts were potent antagonists of the thermic analgesia test; the former extract was also active in the mechanical analgesia test. The chloroformic extract and, to a lesser extent, the ethyl acetate extract and lyophilized infusion demonstrated noteworthy activity as anti‐inflammatory agents. No extract produced an ulcerogenic effect. The hexanic extract had the highest inhibitory effect on ACh induced contraction of rat duodenum and the ethyl acetate extract of oxytocin induced contraction of rat u