They include barbiturates like phenobarbital. MedicationĬhronic obstructive pulmonary disorder (COPD), nausea, motion sickness, overactive bladder (OAB), urinary incontinence (UI)Īnticholinergics block the action of the acetylcholine, a neurotransmitter involved in muscle contractions.Īntiepileptics work by impacting neurotransmitter activity or nerve impulses in the brain. As a result, taking some of these medications can cause pupil dilation as a side effect. Neurotransmitters play a role in pupil size. Many of the medications listed in the following table interfere with your brain’s chemical messengers, also known as neurotransmitters. Here are some prescription, over-the-counter, and commonly misused drugs that cause pupils to dilate. What drugs cause pupils to dilateĭrugs can affect the muscles that shrink or expand the pupils. Whether it’s caused by external or internalįactors, pupil dilation is an involuntary nervous system response. health conditions, such as Holmes-Adie syndrome, congenital aniridia, and mydriasis.You might have heard that looking at someone Such as color and distance, also affect pupil dilation. ThisĪllows more light to reach the retina, making it easier to see. What causes the pupils in our eyes to dilate? Read on to find out which prescription, over-the-counter, and commonly misused drugs affect pupil size. Other factors, such as drugs, can also affect pupil size. Pupils can grow or shrink according to different lighting conditions. The dark part of your eye is called the pupil.
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