Cromoglicic acid: Effect as a mast cell stabilizer
Cromoglicic acid, also called disodium cromoglycate (DNCG), is a classical mast cell stabilizer and one of the oldest substances that act specifically against allergic diseases. In Germany, cromoglicic acid is available as eye drops, nasal spray, inhalation solution, and in oral form for mastocytosis (brand names Vividrin, Cromohexal, Pentatop, and numerous generics). Unlike antihistamines or glucocorticoids, cromoglicic acid works prophylactically by preventing the release of allergic mediators from mast cells. The effect develops over several days and is therefore intended as regular preventive medication.
In clinical practice, cromoglicic acid has a firm place in mild allergic rhinitis and conjunctivitis, especially during the seasonal pollen season, as well as in patients who prefer well-tolerated and cortisone-free options. In asthma therapy, it has been largely replaced by inhaled glucocorticoids, but still plays a role in individual patients and in pediatrics. In mastocytosis, the oral form is an important component of symptom control for gastrointestinal complaints.
Mechanism of action
Cromoglicic acid stabilizes the mast cell membrane and inhibits its degranulation after allergen contact. This prevents or reduces the release of histamine, tryptase, leukotrienes, prostaglandins, and cytokines. The anti-inflammatory and antiallergic effect is not acute, but develops after regular use over days to weeks. Continuous prophylaxis is therefore the typical application.
The exact molecular mechanisms are not fully understood. Interactions with chloride channels, calcium mobilization, and intracellular signaling pathways that lead to mast cell activation are being discussed. Clinical studies show a reduction in allergic symptoms, less eye redness, less sneezing, less itching, less rhinorrhea, and in asthma less exercise and allergen-induced bronchoconstriction. The potency is moderate, especially compared to modern antihistamines and glucocorticoids.
Systemic absorption is very low. The substance acts predominantly locally at the mucous membrane, which explains the good safety profile. The half-life is short, so multiple daily applications are standard.
Applications
- Allergic conjunctivitis, especially seasonal in pollen allergy
- Allergic rhinitis as nasal spray, supplementing lifestyle measures and possibly antihistamine
- Bronchial asthma with an allergic component, especially in pediatrics and in patients with glucocorticoid intolerance
- Exercise-induced asthma, prophylactic inhalation before exertion
- Mastocytosis with gastrointestinal complaints, oral administration in higher doses
- Food-induced allergic reactions in individual indications
Cromoglicic acid is not suitable for acute treatment of allergic symptoms such as acute hay fever attack or acute asthma attack. Here, rapidly acting antihistamines or bronchodilators such as salbutamol are the treatment of choice. Cromoglicic acid develops its effect only after several days of regular use.
Dosage and administration
Eye drops 2 percent: one drop per eye four times daily, during the pollen season or with continuous allergen exposure. With acute symptoms, onset of action only after several days, so ideally start before season begins.
Nasal spray: two sprays per nostril four times daily. Consistent application throughout the season is necessary, not a rescue medication.
Inhalation for asthma: 20 mg inhaled three to four times daily, possibly an additional dose before exertion.
Oral for mastocytosis: 100 to 200 mg four times daily, individually adjusted. Administration approximately 30 minutes before meals.
Application to eyes and nose: wash hands beforehand, do not bring spray bottle or tube into contact with the eye or nasal mucosa, store in a cool and dry place, observe opening date.
Renal insufficiency and hepatic insufficiency: no adjustment necessary due to systemically low absorption. For oral high-dose therapy for mastocytosis, individual assessment.
Side effects
Frequent (eyes): transient burning, stinging, tearing, temporarily blurred vision.
Frequent (nose): local irritation, sneezing, burning.
Frequent (inhalation): cough irritation, throat scratchiness, very rarely bronchospasm.
Frequent (oral): mild gastrointestinal complaints, nausea, diarrhea.
Occasional: allergic reactions to excipients, rash, headaches.
Rare: systemic allergic reactions, bronchospasm, acute angle-closure glaucoma triggering in very sensitive patients.
Preservatives: some eye drops contain benzalkonium chloride, which can damage the cornea with long-term use. Unpreserved single-dose containers are more sensible with frequent use.
Drug interactions
- Antihistamines (oral or topical): meaningful combination, additive antiallergic effect.
- Inhaled glucocorticoids: frequent combination in asthma, complementary efficacy profile.
- Sympathomimetics (salbutamol, formoterol): no relevant pharmacokinetic interaction, often combined clinically.
- Other eye or nasal drops: minimum interval of 10 to 15 minutes to avoid mutual displacement.
- Food with oral administration: take cromoglicic acid on an empty stomach or shortly before meals, absorption reduced by food.
Special notes
Pregnancy: Cromoglicic acid is considered very safe based on long clinical experience because systemic absorption is low. Application in all trimesters is possible, especially as eye drops or nasal spray. Breastfeeding: Transfer into breast milk is not clinically relevant, breastfeeding during therapy is unproblematic.
Children: established in pediatrics, especially for allergic conjunctivitis and allergic rhinitis. In childhood asthma, inhaled glucocorticoids are preferred.
Before starting therapy: Allergy diagnostics (history, skin test, possibly specific IgE) for targeted preparation. Cromoglicic acid is preventive medication that should ideally be started two to four weeks before pollen season.
Lifestyle with allergies: Allergen avoidance where possible (keep windows closed during pollen season, shower in the evening, change bed linen regularly, reduce pillows and carpets), specific immunotherapy in case of clear allergen component and pronounced symptoms.
When to see a doctor: for insufficient efficacy, acute symptoms, severe asthma, new allergies, or unclear findings, specialist consultation is advisable. Cromoglicic acid does not replace comprehensive diagnostics for chronic complaints.
Use with contact lenses: Eye drops without preservatives are better tolerated. Remove lenses before application or choose lens-compatible formulations.
Driving ability: generally not impaired.
You might also be interested in
- Cetirizin, modern antihistamine for allergic rhinitis
- Loratadin, another antihistamine
- Fexofenadin, also an H1 antihistamine
- Montelukast, leukotriene receptor antagonist in asthma
- Budesonid, inhaled glucocorticoid in asthma and allergic rhinitis
Frequently asked questions
Why doesn't cromoglicic acid work immediately?
Unlike antihistamines, cromoglicic acid does not block released mediators, but prevents their release. Building up this mast cell stabilization takes several days of consistent use. Preparation before the pollen season is therefore more sensible than starting after symptoms begin.
Is the substance also suitable for small children?
Cromoglicic acid has been established in pediatrics for decades and is well tolerated. Especially as eye drops and nasal spray, use in children with allergic rhinitis and conjunctivitis is widespread. In childhood asthma, inhaled glucocorticoids are now the first choice, cromoglicic acid can be used as a supplement.
How does cromoglicic acid differ from an antihistamine?
Antihistamines such as cetirizin or loratadin block the H1 receptor and work quickly, ideal as rescue medication. Cromoglicic acid stabilizes mast cells before mediator release and is preventive medication with moderate effect. Both mechanisms of action are complementary and are often combined.
Does the oral form help with hay fever?
The oral form is primarily effective in mastocytosis and individual gastrointestinal indications because it acts predominantly locally in the intestine. For hay fever, topical application as eye drops and nasal spray is significantly more effective.
Sources
- Gelbe Liste, Cromoglicic acid active ingredient profile
- BfArM, Federal Institute for Drugs and Medical Devices
- AWMF, Guidelines on allergic rhinitis, conjunctivitis and asthma
- German Allergy and Asthma Association
Legal notices and disclaimer
The information provided on this page is for general information purposes only and does not constitute medical advice, diagnosis, or treatment recommendation. It does not replace the advice of an approved physician or pharmacist. For chronic or severe allergies and asthma, specialist medical supervision is advisable. All information is based on expert information and recognized scientific sources published at the time of creation; the current product information from the manufacturer is always decisive. Sanoliste assumes no liability for completeness, timeliness, or accuracy of the information presented. In a medical emergency, call the emergency number 112.