, Volume 108, Issue 1–2, pp 51–59 | Cite as

Caffeine tolerance and choice in humans

  • Suzette M. Evans
  • Roland R. Griffiths
Original Investigations


Thirty-two healthy subjects with histories of moderate caffeine consumption abstained from dietary caffeine throughout the study. Subjects were stratified into two groups based on several factors including caffeine preference, which was assessed using a caffeine versus placebo choice procedure. Subsequently, subjects received either caffeine (300 mg t.i.d.) or placebo (placebo t.i.d.) for 18 consecutive days, and thereafter were exposed again to a caffeine versus placebo choice procedure. The study documented tolerance development to the subjective effects of caffeine: after chronic dosing, administration of caffeine produced significant subjective effects in the chronic placebo group but not in the chronic caffeine group. The study also provided indirect evidence for tolerance development: during chronic dosing, the chronic caffeine and placebo groups did not differ meaningfully on ratings of mood and subjective effect. When subjects were categorized into caffeine choosers or nonchoosers, caffeine choosers tended to report positive subjective effects of caffeine and negative subjective effects of placebo. Nonchoosers, in contrast, tended to report negative subjective effects of caffeine. Chronic caffeine did not alter the reinforcing effects of caffeine as assessed by caffeine versus placebo choice, possibly because the relatively short duration of caffeine abstinence in the placebo condition was not sufficient to result in maximal withdrawal effects after termination of the relatively high caffeine dose. This study provides the clearest evidence to date of complete tolerance development to a CNS effect of caffeine in humans.

Key words

Caffeine Tolerance Reinforcement Physical dependence Chronic exposure Subjective effects Humans 


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Copyright information

© Springer-Verlag 1992

Authors and Affiliations

  • Suzette M. Evans
    • 1
  • Roland R. Griffiths
    • 1
    • 2
  1. 1.Department of Psychiatry and Behavioral SciencesThe Johns Hopkins University School of Medicine, Behavioral Biology Research CenterBaltimoreUSA
  2. 2.Department of NeuroscienceThe Johns Hopkins University School of Medicine, Behavioral Biology Research CenterBaltimoreUSA

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