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.

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.

For the Consumer

Applies to cromolyn nasal: nasal spray

Along with its needed effects, cromolyn nasal (the active ingredient contained in NasalCrom) may cause some unwanted effects. Although not all of these side effects may occur, if they do occur they may need medical attention.

Check with your doctor as soon as possible if any of the following side effects occur while taking cromolyn nasal:

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

Some side effects of cromolyn nasal may occur that usually do not need medical attention. These side effects may go away during treatment as your body adjusts to the medicine. Also, your health care professional may be able to tell you about ways to prevent or reduce some of these side effects. Check with your health care professional if any of the following side effects continue or are bothersome or if you have any questions 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.


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

Nervous system

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


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


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

Disclaimer: Every effort has been made to ensure that the information provided is accurate, up-to-date and complete, but no guarantee is made to that effect. In addition, the drug information contained herein may be time sensitive and should not be utilized as a reference resource beyond the date hereof. This material does not endorse drugs, diagnose patients, or recommend therapy. This information is a reference resource designed as supplement to, and not a substitute for, the expertise, skill , knowledge, and judgement of healthcare practitioners in patient care. The absence of a warning for a given drug or combination thereof in no way should be construed to indicate safety, effectiveness, or appropriateness for any given patient. does not assume any responsibility for any aspect of healthcare administered with the aid of materials provided. The information contained herein is not intended to cover all possible uses, directions, precautions, warnings, drug interactions, allergic reactions, or adverse effects. If you have questions about the substances you are taking, check with your doctor, nurse, or pharmacist.