Ketotifen Helcor (Ketotifen Hydrogen Fumarate)

Ketotifen Helcor is used within the allergy and asthma therapeutic area to control hypersensitivity reactions.

• Allergic rhinitis: reduces nasal congestion, itching and sneezing caused by allergen exposure.
• Allergic conjunctivitis: alleviates eye itching, redness and watery discharge.
• Asthma prophylaxis: helps prevent bronchospasm and airway inflammation in patients with mild to moderate asthma.

• Ketotifen exerts its effect by selectively blocking H1‑histamine receptors, preventing histamine‑mediated vasodilation and increased vascular permeability. In parallel, it stabilises mast cells, inhibiting degranulation and the subsequent release of inflammatory mediators such as leukotrienes and prostaglandins, thereby reducing allergic and asthmatic responses.

Ketotifen may cause a range of adverse reactions, which are generally classified by frequency and severity.

Common Side Effects

• Drowsiness: mild to moderate sedation, especially after initial dosing.
• Dry mouth: reduced salivation leading to throat discomfort.
• Headache: transient cranial pain of varying intensity.
• Nausea: occasional stomach upset or queasiness.

Serious or Rare Side Effects

• Severe skin rash or Stevens‑Johnson syndrome: requires immediate medical attention.
• Angioedema: swelling of face, lips or tongue that may compromise airway.
• Hepatic enzyme elevation: abnormal liver function tests indicating possible liver involvement.

Before initiating therapy, consider the following safety measures.

• Pregnancy: consult a healthcare professional; safety data are limited.
• Breastfeeding: use with caution as the drug may be excreted in milk.
• Renal impairment: dose adjustment may be necessary in patients with reduced kidney function.
• Elderly patients: monitor for increased sedation and falls.
• Concomitant CNS depressants: avoid or use under close supervision due to additive drowsiness.
• Store at ambient temperature: keep in the original container, protect from moisture and light.

Ketotifen can interact with several medication classes; awareness helps minimise risk.

Major Interactions (Avoid)

• Monoamine oxidase inhibitors (MAOIs): may enhance central nervous system depression.
• Other CNS depressants (e.g., benzodiazepines, alcohol): increase sedation and impair psychomotor performance.

Moderate Interactions (Monitor Closely)

• Anticholinergic agents: may exacerbate dry mouth.
• Theophylline: potential alteration of plasma concentrations.
• Beta‑agonists: possible reduction of bronchodilator efficacy.