Cromolyn Sodium is used for prophylaxis of bronchial asthma and not in acute bronchial asthma.
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Cromolyn sodium asthma not for acute bronchospasm prescribing information
True. Cromolyn sodium is a mast-cell stabilizer, used prophylactically to reduce bronchial hyperresponsiveness and prevent asthma symptoms, including exercise-induced bronchoconstriction.
It is not useful during an acute asthma attack because it has no direct bronchodilator action and its preventive benefit develops with regular use. Acute bronchospasm requires a rapid-acting bronchodilator such as an inhaled short-acting beta-2 agonist.
The official DailyMed prescribing information specifically states that cromolyn has no role in status asthmaticus. Current use for asthma is limited, as inhaled corticosteroids are more effective.
Lippincott Illustrated Reviews Pharmacology, p. 5216
Lippincott Illustrated Reviews Pharmacology, p. 5216
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GINA 2026 strategy report cromones cromolyn asthma not recommended
Cromolyn sodium in bronchial asthma
Cromolyn sodium is a prophylactic anti-asthma drug, not a drug for rapid relief of acute bronchospasm.
Why it is used prophylactically
Asthma involves airway inflammation and release of mediators such as:
- Histamine
- Leukotrienes
- Prostaglandins
- Platelet-activating factor
Cromolyn acts mainly by stabilizing mast cells and reducing the release of these inflammatory mediators. It also inhibits early and late allergic airway responses. This reduces airway hyperresponsiveness over time.
Its effect is preventive, so it is used regularly or before a known trigger, rather than after symptoms have started.
Why it is not useful in an acute asthma attack
During an acute asthma attack, there is rapid bronchial smooth-muscle constriction. Immediate treatment requires a rapid bronchodilator, usually an inhaled short-acting beta-2 agonist such as salbutamol/albuterol.
Cromolyn:
- Has no intrinsic bronchodilator activity
- Does not relax bronchial smooth muscle
- Does not rapidly reverse wheeze, dyspnea, or airflow obstruction
- Has a preventive rather than rescue effect
Therefore, it must never replace a rescue inhaler in acute bronchospasm or status asthmaticus. The official drug label states that cromolyn has no role in status asthmaticus.
Clinical uses
Historically, inhaled cromolyn was used for:
- Mild persistent asthma, especially in children
- Prevention of exercise-induced bronchoconstriction
- Prevention of symptoms before predictable exposure to triggers, such as allergens, cold air, pollutants, or occupational irritants
For exercise-induced symptoms, it may be inhaled shortly before the trigger, but it is generally less effective than beta-2 agonists.
Adverse effects
Cromolyn is generally well tolerated because systemic absorption is low. Possible adverse effects include:
- Throat irritation
- Cough
- Unpleasant taste
- Occasional bronchospasm after inhalation
- Rare hypersensitivity or anaphylactic reactions
Current role
Cromolyn use has declined substantially because inhaled corticosteroids (ICS) provide better control of airway inflammation and asthma exacerbations. Modern asthma strategies emphasize ICS-containing regimens rather than cromolyn for long-term control. The 2026 GINA asthma report provides current controller and reliever treatment recommendations.
Exam summary
| Feature | Cromolyn sodium |
|---|---|
| Drug class | Mast-cell stabilizer |
| Main action | Inhibits release of inflammatory mediators |
| Role in asthma | Prophylaxis/controller |
| Acute bronchodilation | No |
| Use in acute attack/status asthmaticus | No |
| Helpful in | Mild asthma and prevention of exercise-induced symptoms |
| Current status | Largely replaced by inhaled corticosteroids |
Mnemonic: Cromolyn controls, but does not cure an acute constriction.
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