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Generic name: cyclopentolate ophthalmic [sye-kloe-PEN-toe-late]
Names of brands: Cyclogyl, Cylate
Drug class: Mydriatics

What is Cyclogy?

Cyclopentolate relaxes muscles within your eye and causes them to expand (widen) the pupils. Cyclogyl (for the eyes) is used to dilate your pupils to prepare you for an exam. Cyclogyl can be used for other purposes that are not covered in this guideline for medication.

Side effects of Cyclogyl

Contact a medical professional immediately. If you notice any of the following symptoms that indicate an allergic reaction, symptoms of hives: difficulty breathing or swelling of your lips, face, and throat.

Inform your caregivers immediately in the event that you are suffering from:

  • Blurred vision blurred vision, pain, or seeing halos around light sources;
  • Intense burning or redness of your eyes;
  • Drowsiness;
  • Constipation with little or no urination;
  • Dry lips (or nose), reduced sweating;
  • Fast heartbeats; or
  • Fever, skin eruption, and flushing (warmth, redness, or tingling).

Young children and infants may be more susceptible to adverse effects due to cyclogy. At least for the first 30 minutes after a child has received treatment with Cyclogyl, be aware of the following adverse negative effects:

  • Loss of coordination
  • Unexpected behavior changes;
  • Experiencing a sense of excitement or anxiety;
  • Confusion, speech problems, or
  • Feeding problems and stomach bloating.

Common adverse consequences of Cyclogyl can include:

  • Blurred vision
  • Mild eye irritations or the appearance of redness
  • Puffy eyes; or
  • The eyes are much more sensitive.

This isn't a complete list of possible side effects, and others could happen. Contact your doctor to seek medical advice on the effects. You can report any adverse reactions to the FDA at 1-800-FDA-1088.


It is not recommended to take this medication if you suffer from angle-closure glaucoma.

Prior to Use this drug

It is not recommended to receive Cyclogyl if you've ever experienced an extremely allergic reaction to it or suffer from angle-closure glaucoma.

To be sure Cyclogyl is safe for you, consult your doctor if you suffer from glaucoma.

FDA classification for pregnant women: It isn't known whether Cyclogyl could cause harm to a baby who is not yet born. Consult your physician if you're pregnant.

It isn't clear if the ophthalmic cyclopentolate gets into breast milk or whether it can harm a nursing infant. Inform your doctor if you are breastfeeding a child.

How to take Cyclogyl ?

The medication is usually administered in the 40- to 50-minute period prior to your examination or any other procedure.

A medical professional will apply drops of eye drops into your eyes.

When you've received the drops, keep your eyes closed for about 2 or 3 minutes with your head down without blinking, blinking, or squinting. Make sure to gently press your finger on the inside of the eye to stop the liquid from leaking into the tear duct.

Cyclogy may cause problems with feeding infants. Once this medication is given to your baby, you must wait at least 4 hours before feeding the infant.

What happens if I miss the dose?

Because Cyclogyl is prescribed only when necessary, it doesn't need a regular dosing schedule.

What happens if I overdose?

For medical emergencies, seek emergency medical attention or contact for help at the Poison Help Line at 1-800-222-1222.

What should be avoided?

Cyclogyl may cause blurred vision for as long as 24 hours following use. Be aware if you are driving or doing any other activity that requires clear vision.

Cyclogy could also cause your eyes to be more sensitive to sunlight. As long as the effects last, ensure your eyes are protected from direct sunlight or bright sunlight.

Interaction with other drugs

It's unlikely that other drugs you consume by mouth or inject can affect the eye's cyclopentolate. However, many medications can interact with each other. Be sure to inform your health care providers about the medications you take, including medications that are prescribed and available over the counter, vitamins, and herbs.