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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.
Next: Diagnosis & Tests for Pupil constriction. This section discusses 8 medical conditions causing Pupil constriction. A simple discussion of these causes with additional information is below. The following medical conditions are some of the possible causes of Pupil constriction. There are likely to be other possible causes, so ask your doctor about your symptoms.