The pharmacological actions of double-enkephalin (biphalin; (HCl-Try-D-Ala-Gly-Phe-NH-)2) an analogue of enkephalin, on nociception, respiration and the cough reflex were compared with those of morphine in anesthetized rats. Double-enkephalin (D-Enk), injected i.p., produced significant analgesia at doses of 10 and 20 mg/kg in a hot-plate test. The… (More)
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