Cromoglicic acid

Discover Cromoglicic acid (Cromolyn sodium), a mast cell stabilizer used to prevent symptoms of asthma, allergic rhinitis, and allergic conjunctivitis.

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🏷 ATC Code: R03BC01 📂 Respiratory system -> Drugs for obstructive airway diseases -> Other drugs for obstructive airway diseases, for inhalation -> Cromoglicic acid 🕐 Updated: Mar 14, 2026 ✓ Medical Reference

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What is Cromoglicic Acid?

Cromoglicic acid, also widely known as Cromolyn sodium, is a medication primarily used to prevent allergic reactions. It belongs to a class of drugs known as mast cell stabilizers. Unlike antihistamines that block the effects of histamine once released, or bronchodilators that open airways, cromoglicic acid works by stabilizing mast cells, preventing them from releasing inflammatory chemicals like histamine, leukotrienes, and other mediators of allergic reactions. This prophylactic action makes it an important tool in the long-term management of various allergic conditions, rather than for acute symptom relief. It is available in several forms, including inhalers, nasal sprays, eye drops, and oral capsules, each tailored for specific medical uses.

How Does it Work?

The primary mechanism of action for cromoglicic acid involves inhibiting the degranulation of mast cells. Mast cells are immune cells that play a crucial role in allergic responses. When exposed to allergens (like pollen, dust mites, or certain foods), mast cells release a cascade of inflammatory substances, including histamine. This release leads to the typical symptoms of an allergic reaction, such as itching, swelling, bronchospasm, and increased mucus production. Cromoglicic acid prevents this degranulation by interfering with the influx of calcium ions into the mast cells, which is a critical step in the release process. By stabilizing the mast cell membrane, it effectively stops the allergic cascade before it starts. It's important to note that this medication does not reverse existing allergic symptoms; its strength lies in preventing their onset, requiring consistent use to achieve its full therapeutic effect.

Medical Uses

Asthma

Cromoglicic acid is a valuable medication for the prophylactic treatment of mild to moderate asthma, particularly in children and those with exercise-induced asthma or allergen-induced asthma. It acts as an asthma prevention medication, helping to reduce the frequency and severity of asthma attacks by preventing the airway inflammation triggered by allergens or physical exertion. It is not intended for the relief of acute asthma attacks, for which fast-acting bronchodilators are used.

Allergic Rhinitis

In its nasal spray form, cromoglicic acid is an effective allergic rhinitis treatment. It helps to alleviate symptoms such as sneezing, runny nose, nasal itching, and congestion caused by seasonal or perennial allergic rhinitis (hay fever). Regular use, especially before exposure to known allergens, can significantly reduce the discomfort associated with nasal allergies.

Allergic Conjunctivitis

Eye drops containing cromoglicic acid are prescribed for the treatment of allergic conjunctivitis, providing allergic conjunctivitis relief. This includes seasonal allergic conjunctivitis, perennial allergic conjunctivitis, and vernal keratoconjunctivitis. By preventing the release of inflammatory mediators in the eyes, it reduces itching, redness, and watery eyes.

Food Allergy and Mastocytosis

An oral formulation of cromoglicic acid is used to manage certain gastrointestinal conditions linked to mast cell activation. This includes systemic mastocytosis, a rare disorder characterized by an abnormal accumulation of mast cells, and some forms of food allergy, such as food protein-induced enterocolitis syndrome (FPIES). In these cases, it helps to stabilize mast cells in the gut, reducing symptoms like abdominal pain, diarrhea, and vomiting.

Dosage

The dosage and administration of Cromoglicic acid vary significantly depending on the form of the medication and the condition being treated. For asthma, it is typically administered via an inhaler or nebulizer, often multiple times a day. Nasal sprays for allergic rhinitis are usually used several times daily, especially during peak allergy seasons. Eye drops for allergic conjunctivitis also require frequent application throughout the day. Oral capsules for gastrointestinal conditions are taken before meals. It is crucial to follow the precise instructions provided by a healthcare professional or detailed on the medication's label. Consistency is key, as cromoglicic acid needs to be used regularly, even when symptoms are absent, to maintain its preventive effect. Self-medication is not advised; always consult a doctor for appropriate dosage and treatment duration.

Side Effects

Cromoglicic acid is generally well-tolerated, with a low incidence of severe side effects, largely due to its minimal systemic absorption. Common side effects, which are usually mild and transient, vary by formulation:

  • Inhalation: Throat irritation, cough, dry mouth, and hoarseness.
  • Nasal spray: Sneezing, stinging or burning sensation in the nose, nasal irritation, and an unpleasant taste.
  • Eye drops: Transient stinging or burning upon application, watery eyes, and foreign body sensation.
  • Oral capsules: Nausea, diarrhea, abdominal pain, and headache.

More serious side effects are rare but can include paradoxical bronchospasm (worsening of breathing difficulties immediately after inhalation) or allergic reactions (rash, itching, swelling, severe dizziness, trouble breathing). If any severe or persistent side effects occur, medical attention should be sought immediately.

Drug Interactions

One of the advantages of Cromoglicic acid is its favorable drug interaction profile. Due to its poor systemic absorption, it has very few significant interactions with other medications. This makes it a suitable option for patients who may be taking multiple drugs for other conditions. However, it is always important to inform your doctor or pharmacist about all prescription, over-the-counter, and herbal medications you are currently using or plan to use. While interactions are rare, a healthcare professional can ensure there are no unforeseen complications or contraindications with your specific health profile.

FAQ

Is Cromoglicic acid a steroid?

No, Cromoglicic acid is not a steroid. It is a mast cell stabilizer, which works by a different mechanism to prevent allergic reactions and inflammation without the systemic side effects associated with corticosteroids.

How long does Cromoglicic acid take to work?

Unlike fast-acting relief medications, cromoglicic acid's full preventive effect can take several days to a few weeks of consistent use to become apparent. It needs to be taken regularly to build up its protective action.

Can Cromoglicic acid be used during pregnancy?

Cromoglicic acid is generally considered to have a good safety profile during pregnancy, with studies showing no evidence of harm. However, as with any medication during pregnancy, it should only be used under the guidance and recommendation of a healthcare professional.

What is the difference between Cromoglicic acid and antihistamines?

Antihistamines work by blocking the action of histamine after it has been released, providing relief from symptoms. Cromoglicic acid, on the other hand, prevents the release of histamine and other inflammatory mediators from mast cells in the first place. Both are used for allergies, but they act at different stages of the allergic response.

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Summary

Cromoglicic acid is a valuable mast cell stabilizer used to prevent allergic reactions in various parts of the body. From its role as an asthma prevention medication to providing allergic rhinitis treatment and allergic conjunctivitis relief, and even assisting in the management of specific gastrointestinal allergies, its prophylactic action is key. While it doesn't offer immediate relief, consistent use of this well-tolerated medication can significantly reduce the frequency and severity of symptoms associated with chronic allergic conditions, making it an essential component of long-term allergy and asthma management, especially for those sensitive to seasonal allergies drug options.