Related Experiment Video
Updated: May 11, 2026

Pupillary Response as Assessment of Effective Seizure Induction by Electroconvulsive Therapy
Published on: April 11, 2019
Myoclonic seizure due to cyclopentolate eye drop in a preterm infant
Ayşe Büyükcam1, H Tolga Celik, Ayşe Korkmaz
1Department of Pediatrics, Hacettepe University Faculty of Medicine, Ankara, Turkey. dr.aysebaktir@gmail.com
Insights
Cyclopentolate eye drops can cause rare myoclonic seizures in infants. This case highlights the importance of appropriate dosing for cyclopentolate hydrochloride and phenylephrine hydrochloride, especially in premature infants undergoing retinopathy of prematurity screening.
Area of Science:
- Ophthalmology
- Pediatrics
- Pharmacology
Background:
- Cyclopentolate is a common ophthalmic medication known for its potent mydriatic and cycloplegic effects.
- Systemic side effects of cyclopentolate have been documented in pediatric populations.
- Phenylephrine is often used in combination with cyclopentolate for enhanced mydriasis.
Observation:
- A three-month-old infant developed a convulsion after receiving cyclopentolate hydrochloride and phenylephrine hydrochloride eye drops.
- The eye drops were administered prior to ophthalmoscopy for the evaluation of retinopathy of prematurity (ROP).
Findings:
- This case represents a rare instance of myoclonic seizure, a serious systemic side effect, associated with topical cyclopentolate and phenylephrine use.
- The infant's convulsion occurred in the context of standard ophthalmic examination procedures.
Implications:
- Ophthalmologists and pediatricians should be vigilant regarding the potential for uncommon systemic adverse events, such as seizures, with cyclopentolate eye drops.
- Careful consideration of dosage and patient-specific risk factors is crucial when prescribing these medications, particularly in neonates and infants.
- Further research into the neurotoxic potential and safe dosing of ophthalmic agents in pediatric populations is warranted.
Abstract:
Cyclopentolate is widely used in ophthalmology for its intense mydriatic and cycloplegic activity. Systemic side effects have been described in both adults and children. Myoclonic seizure is a rare side effect of eye drops that are used in eye examinations. We report herein a case of convulsion in a three month- old girl following cyclopentolate hydrochloride and phenylephrine hydrochloride eye drops, which were used in advance of ophthalmoscopy for examination of retinopathy of prematurity (ROP). Physicians should be aware of the uncommon systemic side effects of cyclopentolate, and drops should be used in appropriate dosages.
Related Concept Videos
Antiepileptic Drugs: Potassium Channel Activators
Ezogabine has gained approval as an adjunctive treatment...
Ophthalmic Drug Delivery Systems
Direct-Acting Cholinergic Agonists: Therapeutic Uses
Seizures l: Introduction
Seizures: Classification
Seizures are typically classified into two main categories: focal and generalized seizures.
Focal Seizures
Focal seizures originate from specific regions of the brain. These seizures are further sub-classified into two types:
Accessory Structures of the Eye

