cyclopentolate hydrochloride at a glance
Medicine class
Antimuscarinic mydriatic and cycloplegic eye drop.
Main role
Widens the pupil and relaxes focusing for refraction and examination inside the eye.
After administration
Near vision may blur and bright light may be uncomfortable until the effects wear off.
What is cyclopentolate hydrochloride used for?
Selected UK products are licensed as topical mydriatic and cycloplegic eye drops.
Temporarily widening the pupil to examine the back of the eye.
Temporarily stopping accommodation so refraction and spectacle needs can be assessed accurately.
Dilating the pupil in inflammatory eye conditions such as uveitis and helping release posterior synechiae when clinically appropriate.
How does cyclopentolate hydrochloride work?
Cyclopentolate blocks muscarinic acetylcholine receptors in the eye. This relaxes the iris sphincter, enlarging the pupil, and relaxes the ciliary muscle, temporarily preventing near focusing.
cyclopentolate hydrochloride preparations and strengths
Eye drops
Route: Ophthalmic
Strengths: 0.5%, 1.0%, 1%
How to take cyclopentolate hydrochloride
Use only as instructed by the eye-care team. Wash your hands, avoid touching the nozzle, place the drops inside the lower eyelid and close the eye. Gently press the inner corner beside the nose to reduce drainage and systemic absorption.
Remove contact lenses before administration and do not replace them until the effects have fully worn off.
Use a single-use unit immediately after opening and discard it afterwards, even if liquid remains.
Do not drive or operate hazardous machinery until vision is clear.
Sunglasses or a hat may improve comfort in bright light.
cyclopentolate hydrochloride side effects
Common or expected effects
- Brief stinging or eye irritation.
- Blurred vision, particularly for close work.
- Sensitivity to bright light.
- Temporary difficulty focusing.
Get urgent medical advice
- Severe allergic reaction, including breathing difficulty or facial, tongue or throat swelling.
- Seizures, hallucinations, marked confusion, abnormal behaviour or severe drowsiness.
- Fast, slow or irregular heartbeat, palpitations or collapse.
- Severe eye pain or symptoms suggesting a sudden rise in eye pressure.
- Difficulty passing urine, marked fever or other systemic anticholinergic effects.
- In premature infants: abdominal swelling, vomiting, feeding intolerance or bloody stools.
cyclopentolate hydrochloride in pregnancy
Pregnancy data are limited. Selected UK product information advises avoiding cyclopentolate during pregnancy as a precaution unless a clinician considers it essential. Discuss planned or recent exposure with the eye specialist or prescriber.
cyclopentolate hydrochloride while breastfeeding
Selected UK product information advises against use during breastfeeding because milk transfer is unknown and infants may be sensitive to anticholinergic effects. Other published evidence considers a single ophthalmic exposure unlikely to disrupt breastfeeding, so specialist assessment is appropriate.
cyclopentolate hydrochloride interactions
Systemic effects can occur even though cyclopentolate is applied to the eye. Tell the eye-care team about all medicines being used.
Antihistamines and other anticholinergic medicines
May increase dry mouth, flushing, urinary retention, rapid heartbeat, confusion and other anticholinergic effects.
Tricyclic or tetracyclic antidepressants
May increase systemic anticholinergic effects.
Phenothiazines and butyrophenones
May increase anticholinergic adverse effects.
Common questions about cyclopentolate hydrochloride
Answers are fully visible for fast scanning and source review.
What is cyclopentolate hydrochloride used for in an eye test?
It widens the pupil and temporarily stops near focusing so the clinician can examine the eye and measure refractive error more accurately.
How long does blurred vision last?
Recovery varies. It commonly takes several hours, while enlarged pupils or blurred near vision can sometimes persist for a day or longer.
Can I drive after using the eye drops?
Sources
These sources were used to prepare and review this medicine page.
Prepared and reviewed by the iatroX editorial team.