Summary A double‐blind study was made comparing pethidine 150 mg. with phenazocine (Narphen) 3 mg. for relief of pain in labour. In these doses neither pethidine nor phenazocine gave consistently effective analgesia. Phenazocine was less effective as an analgesia but had a lower incidence of side effects and fetal depression. It was concluded that the doses chosen were not equivalent.
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Grant et al. (1970) studied this question.
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