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Results Data show that the perceived effectiveness was positively related to the number of times patients have fictively taken the painkiller (p < .01) and not to its actual contingency (i.e., actual effectiveness). Secondly, acceptance was positively related to perceived effectiveness of the painkiller (p < .05), but did not moderate the relationship between perceived effectiveness and frequency of medication intake. Conclusions Results of the present study suggest that a higher intake of acute medication by chronic headache patients is related to higher perceived effectiveness of the acute medication, independent of its actual effectiveness. This IoC-effect is however not influenced by acceptance. No conflict of interest.

EHMTI-0252. The frequency of acute medication intake relates to its perceived effectiveness in chronic headache patients