Ritalin Use Modifies Alcohol Effects in Rats

Abstract

Methylphenidate (MPD), known as Ritalin, is a common drug prescribed for those diagnosed with Attention Deficit Hyperactivity Disorder (ADHD).There are reports that many MPD users consume alcohol, resulting in toxic effects and hospitalization. The goal of this study was to investigate the effects of ethanol in rats concomitant with acute and repetitive MPD exposure. Rats were divided into four groups, control (saline), 0.6 mg/kg MPD, 2.5 mg/kg MPD, and 10.0 mg/kg MPD groups and lasted for 12 consecutive days. Ethanol was given after repeated MPD administration as follows. On experimental day 1 (ED 1), all animals were treated with saline to establish baseline, on ED 2 through ED 7 either saline or MPD (0.6, 2.5, or 10.0 mg/kg) was given. On ED 11, after three days without treatment (ED 8 - 10), rats were treated as they were on ED 2 - 7. At ED 12, 1 g/kg ethanol was administered, and one hour of locomotor activity was recorded after alcohol administration, using the open field assay. The data show a dose response characteristic of increased locomotor activity with increasing doses of MPD. Ethanol administration alone depresses locomotor activity. The depressive effect of alcohol was significantly attenuated in animals treated with MPD, in a dose dependent manner. The higher dose of MPD previously administered resulted in a larger attenuation of the ethanol’s suppressive effect. These trends demonstrate that chronic MPD exposure directly influences the effects of alcohol in rats. Under these circumstances, it is reasonable to assume that a subject will need to consume an increased amount of ethanol in order to attain the ethanol effect desired. This discrepancy between effects and exposure may be a liability for ethanol toxicity.

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Sonne, B. and Dafny, N. (2014) Ritalin Use Modifies Alcohol Effects in Rats. Journal of Behavioral and Brain Science, 4, 453-464. doi: 10.4236/jbbs.2014.410044.

Conflicts of Interest

The authors declare no conflicts of interest.

References

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