Drug Effects Questionnaire
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The Drug Effects Questionnaire (DEQ), also known as the Drug Effect Questionnaire, is a psychometric questionnaire which is used to assess the subjective effects of psychoactive drugs.[1][2][3] It is a visual analogue scale (VAS).[1][2] The questionnaire is used to quickly measure whether a subject feels the drug, "feels high", likes or dislikes the effects, and whether they want more of the drug.[1][2] The format of the DEQ is often modified and varies widely across studies, such that it cannot easily be regarded as a standardized instrument.[1] The DEQ has notably been used to assess the subjective effects of serotonergic psychedelics in clinical trials.[1][4] It was first described in the literature by 1961.[2][5]
