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Drugs can cause a pupil to change in two ways by dilation making the pupil larger or constricting the pupils.â¦ Only two drugs constrict the pupils those being opiates and alcohol. So anything but, these can cause the pupils to dilate.
Pupil constriction: Introduction. Pupil constriction: When there is constriction of the pupils. See detailed information below for a list of 8 causes of Pupil constriction, Symptom Checker, including diseases and drug side effect causes. Causes of Pupil constriction: