Abstract
Sarapin is a distillate of the pitcher plant that has long been used in human and veterinary medicine for 'regional analgesia'. The mechanism of the reported analgesic response is unknown; however, the agent is purported to provide more effective analgesia for slow, chronic pain than for sharp, acute pain. Reportedly, Sarapin is also widely used as an analgesic agent in the horse, generally in combination with corticosteroids and other agents. To determine its local anaesthetic efficacy in the horse, we tested Sarapin in a unilateral abaxial sesamoid block model at two dose levels, 2 mL and 10 mL per site, respectively. Cutaneous pain was induced with a light/heat lamp, and analgesia was assessed by measuring the hoof-withdrawal reflex latency period. Neither dose of Sarapin altered hoof-withdrawal reflex latency in this experimental model tested over a two-week period. Based on the demonstrated efficacy of this local anaesthetic model, it seems clear that Sarapin has no significant classical local anaesthetic actions in the horse, and probably not in other species either.
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