Cromolyn Eyedrops (Sodium Cromoglycate)

Cromolyn Eyedrops

(Brand Option)

Prescription RequiredPrescription Required
FormulationFormulation: Opthalmic Solution (pms)
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Sodium Cromoglycate

(Generic Alternative)

Prescription RequiredPrescription Required
FormulationFormulation: Opthalmic Solution (pms)
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Cromolyn eyedrops are used to treat certain allergic eye conditions, including vernal keratoconjunctivitis, vernal conjunctivitis, and vernal keratitis. It prevents itching of the eyes that can occur with these conditions. 

Cromolyn is known as a mast cell stabilizer, working by blocking certain natural substances (histamine, SRS-A) that cause allergic symptoms.

The usual adult dose involves instilling 1 or 2 drops into both eyes 4 to 6 times a day. Symptom improvement is generally observed within a few days, although treatment up to 6 weeks may be needed. Treatment should continue as long as needed to sustain improvement.


  • Follow your Cromolyn eyedrops's instructions on dosage and frequency. It's typically used 4 times a day for up to 3 months.
  • Wash your hands thoroughly with soap and water to prevent contamination.
  • Tilt your head back, look up, and gently pull down your lower eyelid to create a small pocket.
  • Apply drops: Hold the dropper directly above the eye and squeeze one drop into the pouch.
  • Close eyes and apply pressure: Close your eyes gently for 1-2 minutes. Place a finger at the corner of your eye near the nose and press gently to prevent drainage.
  • Avoid blinking/rubbing: Minimize blinking and avoid rubbing your eyes after application.
  • Repeat for another eye (if needed): If both eyes require treatment, repeat these steps for the other eye.
  • Don't rinse the dropper: Leave the dropper unrinsed. Replace the cap securely after each use.
  • Use with caution with other eye meds: If using other eye medications, wait at least 5 minutes between applications. Use cromolyn before ointments.
  • Wait for clear vision: Allow a few minutes for your vision to clear before driving or operating machinery.
  • Use consistently: Use cromolyn regularly at the prescribed times each day for the full duration of treatment.
  • Be patient: Relief may take several days of continued use, with full benefit taking up to 6 weeks.


  • Don't touch the dropper tip: Avoid touching the dropper tip to your eye, eyelids, or any other surface to prevent contamination.
  • Don't wear contact lenses: It's best to avoid wearing contact lenses while using cromolyn eyedrops.
  • Don't exceed dosage: Don't use more drops than prescribed or use them more frequently.
  • Don't stop early: Continue using cromolyn for the full prescribed duration, even if symptoms improve.
  • Don't use it for immediate relief: If immediate relief is needed, use other quick-relief medications as directed by your Cromolyn eyedrops alongside cromolyn.
  • Don't ignore worsening conditions: If your condition doesn't improve or worsens, consult your Cromolyn eyedrops.

Common side effects may include:

  • Mild burning or stinging of the eyes
  • Dry or irritated eyes
  • Puffy eyes
  • Watery eyes

Serious side effects that may require immediate medical attention include:

  • Severe burning, stinging, or irritation in the eyes after using the eye drops
  • Signs of an allergic reaction, such as hives, difficulty breathing, or swelling of the face, lips, tongue, or throat

This is not an exhaustive list, and other side effects may occur. If you experience any unusual or severe side effects while taking Cromolyn eyedrops,  contact your healthcare provider for medical advice.

Inform your Cromolyn eyedrops of any allergies to cromolyn or the inactive ingredients (like benzalkonium chloride, a preservative) before using the eyedrops.

Disclose your contact lens use to your Cromolyn eyedrops before using cromolyn eyedrops.

Cromolyn eyedrops may cause temporary blurred vision after application. Avoid activities requiring clear vision (driving, machinery) until your vision clears.

Inform your Cromolyn eyedrops about all medications you take (including cromolyn eyedrops) before surgery.

Discuss the risks and benefits of cromolyn eyedrops with your Cromolyn eyedrops before using them if you are pregnant or breastfeeding, as safety during these times is not fully established.

Generic name:

Sodium Cromoglycate, Sodium Cromoglycate


Opthalmic Solution (pms)

Strength(s): 2%, 4%
Quantities Available: 5, 10
Important Information
The information above for Cromolyn Eyedrops (Sodium Cromoglycate) was provided to by third parties. In no way should this information substitute for the advice of a physician. Consult a doctor or qualified health care professional if you have any medical concerns. widget logo
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