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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.
The medical term for dilated pupils is mydriasis. Medications or other drugs can also cause the pupil to dilate, either intentionally or as a side effect. For example, eye care professionals often use eye drops that dilate the pupils in order to examine structures at the back of eye, such as the retina.Other medications and illicit drugs that can dilate the pupils include cough and cold medications, decongestants, cocaine, and marijuana.In most cases, the dilation caused by these drugs is temporary, and the pupils return to normal as the effect wears off.hese conditions may dilate only one pupil, or they may dilate the pupils to a different degree on each side, resulting in unequal pupil size. Pupils that do not respond to light or other stimuli are called fixed pupils. Often, abnormally dilated pupils are also fixed pupils.