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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.
All anticholinergics used in the management of vertigo have prominent side effects of dry mouth, dilated pupils, and sedation. Scopolamine and atropine are nonspecific muscarinic receptor antagonists (Barton et al, 1994).