2009 5 Nov

The majority of exposures involved Wellbutrin SR; however, Wellbutrin exposures involved a higher percentage of intentional overdoses and serious clinical effects. Clinical effects related to bupropion were noted in 2,247 (31%) exposures; 8% of all children 6-years-old compared to 46% of all teenagers. Seizures developed in 15% of all intentional exposures. Cardiovascular disturbances were extremely uncommon after overdose. The majority of unintentional bupropion-only exposures result in minimal or no clinical toxicity; however, a significant number of intentional overdoses result in seizures.

Zyban Sr without prescription, a tobacco-cessation product, shares discriminative stimulus effects with cocaine and methamphetamine. The discriminative stimulus effects of these drugs, in turn, overlap with those of nicotine. This study investigated the overlap in discriminative stimulus effects of bupropion and tobacco. Rats were trained to discriminate 0.4 mg/kg (−)-nicotine from saline in 2-lever drug discrimination.

Both nicotine and bupropion substituted for nicotine; however, nicotine’s effects were blocked by the nicotinic antagonist mecamylamine, whereas those of bupropion were not. These results suggest that bupropion may be producing its nicotine-like discriminative stimulus effects through a different mechanism than nicotine. Given bupropion’s shared pharmacology with dopamine transport inhibitors, these effects may be produced in part through bupropion’s actions on dopaminergic neurotransmission.

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“To me, clowns aren't funny. In fact, they're kind of scary. I've wondered where this started and I think it goes back to the time I went to the circus, and a clown killed my dad.”
by Jack Handy