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Pharmacol Biochem Behav. 2004 Apr;77(4):711-5.

A laboratory study of hydromorphone and cyclazocine on smoking behavior in residential polydrug users.

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National Institute on Drug Abuse (NIDA), Intramural Research Program, Clinical Pharmacology and Therapeutics Branch, 5500 Nathan Shock Drive, Baltimore, MD 21224, USA.


The effects of cyclazocine and hydromorphone on spontaneous and laboratory cigarette smoking were compared in a double-blind, placebo-controlled, crossover study. Participants (seven men, one woman) received oral doses of placebo, cyclazocine (0.2, 0.4, and 0.8 mg) and hydromorphone (5 and 15 mg) in a randomized order on experimental days. Spontaneous smoking was recorded during two intervals on the experimental days: a 3-h period 5-8 h after drug administration (Interval 1), and the rest of the day (Interval 2). Measures of smoking topography and subjective and physiologic effects of a single cigarette were obtained on the experimental days. Neither hydromorphone nor cyclazocine significantly changed spontaneous smoking when compared to the placebo condition; however, compared to hydromorphone (5 mg), cyclazocine (0.4 and 0.8 mg) decreased spontaneous smoking during Interval 1. Hydromorphone (5 and 15 mg) and cyclazocine (0.4 and 0.8 mg) diminished smoking-induced increases in heart rate. Compared to the placebo condition, cyclazocine (0.2 and 0.4 mg) reduced exhaled carbon monoxide (CO) boost, a measure of smoke exposure. Further studies of the effects of kappa opioid agonists on smoking behavior may lead to a better understanding of the role of opiates in smoking behavior.

[Indexed for MEDLINE]

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