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Loratadine – Effects, Dosage and Side Effects

Loratadine is a second-generation antihistamine used to relieve allergy symptoms such as hay fever, hives, and allergic rhinitis. It is non-drowsy and available over the counter.

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Things worth knowing about "Loratadine"

Loratadine is a second-generation antihistamine used to relieve allergy symptoms such as hay fever, hives, and allergic rhinitis. It is non-drowsy and available over the counter.

What is Loratadine?

Loratadine is a second-generation antihistamine that works by selectively blocking H1 histamine receptors. By preventing histamine from binding to these receptors, it reduces the typical symptoms of allergic reactions. Unlike older, first-generation antihistamines, loratadine has a much lower sedating effect because it does not readily cross the blood-brain barrier.

Indications – When is Loratadine Used?

Loratadine is used to relieve symptoms associated with:

Allergic rhinitis (hay fever): sneezing, runny or blocked nose, itchy and watery eyes
Chronic idiopathic urticaria (hives): skin rash, itching, and welts
Allergic conjunctivitis (eye inflammation triggered by allergens)
Other allergic skin conditions

Mechanism of Action

When the body is exposed to an allergen, mast cells release histamine, which binds to H1 receptors on various cells and causes symptoms such as itching, sneezing, swelling, and redness. Loratadine competitively blocks these H1 receptors, preventing histamine from exerting its effects. Because loratadine crosses the blood-brain barrier only minimally, it causes significantly less drowsiness compared to first-generation antihistamines such as diphenhydramine.

Dosage and Administration

The standard recommended dose for adults and children aged 12 years and older is 10 mg loratadine once daily. Loratadine is available in several forms:

Tablets (10 mg)
Orally disintegrating tablets
Syrup (for children)

For children between 2 and 12 years of age, dosing is based on body weight. Loratadine can be taken with or without food. Dosage adjustment may be necessary in patients with significant liver impairment. Always follow the instructions on the package leaflet or consult a healthcare professional.

Side Effects

Loratadine is generally well tolerated. Possible side effects include:

Common: headache, dry mouth, fatigue (usually mild and infrequent)
Occasional: nausea, stomach discomfort, nervousness
Rare: cardiac arrhythmias, elevated liver enzymes, hypersensitivity reactions to the active substance

Compared to first-generation antihistamines, the risk of significant drowsiness is very low, making loratadine suitable for people who drive or operate machinery.

Drug Interactions

Certain medications may increase blood levels of loratadine, including:

Macrolide antibiotics (e.g., erythromycin)
Antifungals (e.g., ketoconazole)
Cimetidine (a stomach acid blocker)

These interactions are generally not clinically significant given the wide therapeutic window of loratadine. However, patients taking multiple medications should always consult a doctor or pharmacist.

Contraindications and Precautions

Loratadine should not be used in cases of:

Known hypersensitivity to loratadine or any of its excipients
Severe hepatic impairment (use only under medical supervision)

Use during pregnancy and breastfeeding should only occur after consultation with a healthcare provider, although available data do not indicate teratogenic effects.

References

European Medicines Agency (EMA): Product information on Loratadine, www.ema.europa.eu
Brunton L. et al. - Goodman & Gilman's The Pharmacological Basis of Therapeutics. 13th Edition. McGraw-Hill Education, 2017.
World Health Organization (WHO): Model Formulary 2008 – Antihistamines, www.who.int

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