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NasalCrom Side Effects

Generic Name: cromolyn nasal

Note: This page contains side effects data for the generic drug cromolyn nasal. It is possible that some of the dosage forms included below may not apply to the brand name NasalCrom.

In Summary

Common side effects of NasalCrom include: sneezing. Other side effects include: burning sensation of the nose and stinging sensation of the nose. See below for a comprehensive list of adverse effects.

For the Consumer

Applies to cromolyn nasal: nasal spray

As well as its needed effects, cromolyn nasal (the active ingredient contained in NasalCrom) may cause unwanted side effects that require medical attention.

Severity: Moderate

If any of the following side effects occur while taking cromolyn nasal, check with your doctor or nurse as soon as possible:

  • Allergic reaction (coughing
  • difficulty in swallowing
  • hives or itching
  • swelling of face, lips, or eyelids
  • wheezing or difficulty in breathing)
  • nosebleeds
  • skin rash

Severity: Minor

Some cromolyn nasal side effects may not need any medical attention. As your body gets used to the medicine these side effects may disappear. Your health care professional may be able to help you prevent or reduce these side effects, but do check with them if any of the following side effects continue, or if you are concerned about them:

More common:
  • Burning, stinging, or irritation inside of nose
  • flushing
  • increase in sneezing
Less common:
  • Cough
  • headache
  • postnasal drip
  • unpleasant taste

For Healthcare Professionals

Applies to cromolyn nasal: nasal spray


Respiratory side effects have included sneezing (10%), nasal stinging (5%), burning (4%), and irritation (2.5%). Epistaxis and postnasal drip have been reported in less than 1% of patients.[Ref]


Hypersensitivity side effects have included anaphylaxis. Cromolyn hypersensitivity has been reported to develop after weeks to years of use.[Ref]

Nervous system

Nervous system side effects have been generally limited to headache, which occurred in 2% of patients.[Ref]


Gastrointestinal side effects have included bad taste in 2% of patients.[Ref]


Dermatologic side effects have included rash in less than 1% of patients.[Ref]


1. "Product Information. Nasalcrom (cromolyn)." Rhone-Poulenc Rorer, Collegeville, PA.

It is possible that some side effects of NasalCrom may not have been reported. These can be reported to the FDA here. Always consult a healthcare professional for medical advice.

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