Cyclopentolate is a medication used to dilate the pupil of the eye. It belongs to a class of drugs called anticholinergics. Cyclopentolate works by blocking certain receptors in the muscles of the eye, causing the pupil to dilate and the muscles to relax. This dilation allows healthcare providers to better examine the interior of the eye during eye examinations or procedures. Cyclopentolate is typically administered as eye drops and its effects can last for several hours. Common side effects may include temporary stinging or burning sensation in the eyes, blurred vision, sensitivity to light, and temporary increase in intraocular pressure. If you experience severe or persistent side effects, contact your eye care professional promptly. It’s important to use cyclopentolate as directed and to follow any instructions provided by your healthcare provider.