Cyclogyl is the brand name for cyclopentolate eye drops used to widen the pupil. It belongs to a class of anticholinergic medications that block muscarinic receptors in the eye. By inhibiting these receptors the drug relaxes the muscles that control pupil size and focus. This action produces prolonged mydriasis and cycloplegia which facilitate eye examinations. The therapeutic effect is achieved through topical application that rapidly reaches the iris and ciliary body. The resulting loss of accommodation allows clear visualization of retinal and anterior segment structures.

Cyclogyl is a brand name for cyclopentolate eye drops used in ophthalmology. The drug belongs to the class of antimuscarinic agents that block cholinergic receptors in the eye. By antagonizing muscarinic receptors in the iris sphincter muscle, Cyclogyl causes pupil dilation known as mydriasis. The same receptor blockade relaxes the ciliary muscle resulting in cycloplegia that prevents the eye from focusing. This combination of effects allows eye care professionals to obtain a wide non-reactive pupil for examination. The pharmacological action is achieved through competitive inhibition of acetylcholine at parasympathetic nerve endings. The resulting paralysis of the pupillary sphincter and ciliary body produces a fixed dilated pupil that lasts several hours. Because the drug acts locally in the eye systemic absorption is minimal and the intended effects are confined to ocular tissue.

Cyclogyl may cause temporary blurred vision after administration. It can also lead to increased sensitivity to light. Some users experience mild eye discomfort or a stinging sensation. It may occasionally cause headache or dizziness. It can result in prolonged pupil dilation which affects visual acuity. It may rarely cause allergic reactions such as itching or redness.

Cyclogyl may cause temporary blurred vision after administration. It can increase sensitivity to light in some users. Some individuals experience mild stinging or irritation of the eye surface. The medication may lead to dilation that lasts several hours. Prolonged dilation can affect depth perception during the effect period. Dryness of the conjunctiva is reported in certain cases. Systemic effects such as headache are rarely observed.