![]() ![]() Non-Opioid Drugs That Can Cause Constricted Pupils Illegal forms of opioids or opiates include: During use, opioids tend to stimulate the parasympathetic nerve and cause constricted pupils. Generally, drugs classified as opioids will constrict pupils when the drug is ingested. Generally, stimulants dilate pupils and depressants (like opioids) cause constricted pupils. But substance use and abuse can affect the central nervous system and interfere with the ability of the eyes to react appropriately. Usually surrounding light causes stimulation of the relevant nerve to dilate or constrict the pupils. Pupils that do not dilate or constrict properly can create, or be a symptom of, serious vision problems. Pupil dilation and constriction is an important function that controls the amount of light that enters the eye and allows a person to see properly. When the sympathetic nerve is stimulated, pupils dilate. Normally, when the parasympathetic nerve is activated, it causes pupils to constrict, or narrow. Pupil constriction and dilation are controlled by the sympathetic and parasympathetic nervous systems in the brain. ![]() One of the more noticeable, and uncontrollable, ways is dilated or constricted pupils. Physiological changes in the brain can appear in a variety of ways in the rest of the body. On the other hand, depressants generally inhibit brain activity causing drowsiness, lethargy, decreased heart rate, blood pressure, and a sense of calm. For instance, stimulants tend to affect the brain in a way that increases alertness, energy levels, heart rate and blood pressure. How a particular drug affects the body often depends on the type of drug being used. Motivational Interviewing Therapy Program. ![]()
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