Summary
The interactions between ethanol and antidepressant drugs (both tricyclics and newer non-tricyclics) were studied in mice. The ability of these drugs to enhance the sedative effects of ethanol at two different doses (3.2 and 4.0 g/kg) was measured. The percentage of mice losing the righting-reflex was used for the lower dose, and the duration of ethanol-induced sleep was used at the higher dose. The relative order of potency was amitriptyline>-imipramine>maprotiline=mianserin>desipramine>-chlorimipramine>iprindole>-alaproclate>norzimelidine>-zimelidine. Amitriptyline (60 mg/kg) caused death in all mice when combined with 4.0 g/kg ethanol. Clinically established antidepressants which enhanced ethanol sedation only at doses considerably above therapeutic levels were zimelidine and iprindole. The relative potency of the antidepressants to enhance ethanol sedation is correlated with their inherent sedative properties which are in turn related to their ability to block central 5-HT,α-NA, muscarinic and H1-receptors. Amitriptyline (20 mg/kg) was found to increase ethanol plasma levels to 202, 167 and 132% of control values at 30, 60 and 90 min after ethanol administration, respectively. Desipramine, mianserin and alaproclate also increased ethanol plasma levels initially, but to a lesser extent. These findings suggest that in addition to their sedative effect, several antidepressants, particularly amitriptyline, are likely to interact with ethanol by increasing its concentration in plasma.
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Cott, J.M., Ögren, S.O. Antidepressant drugs and ethanol: Behavioral and pharmacokinetic interactions in mice. J. Neural Transmission 48, 223–240 (1980). https://doi.org/10.1007/BF01250658
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DOI: https://doi.org/10.1007/BF01250658