Antiallergic

Antihistamines: The First Line of Defence

Antihistamines are the most commonly used antiallergic medications and work by blocking histamine, a chemical your body releases during allergic reactions. Histamine causes itching, swelling, redness, and other allergy symptoms, so antihistamines provide quick relief.

Australia has two main types of antihistamines available:

• First-generation antihistamines like chlorpheniramine can cause drowsiness but work quickly, making them suitable for nighttime use
• Second-generation antihistamines are newer formulations that cause less drowsiness and longer-lasting relief

Popular Australian brands include Claratyne (loratadine), Piriteze (cetirizine), and Telfast (fexofenadine). These medications are available over-the-counter at most Australian pharmacies without prescription. They’re effective for relieving sneezing, runny nose, itchy eyes, and skin reactions. You can take antihistamines regularly during allergy season or as needed when symptoms appear.

Most second-generation antihistamines take about 20 to 60 minutes to work and provide relief lasting 12 to 24 hours. They’re suitable for adults and children, though dosages vary. Antihistamines are generally well-tolerated with minimal side effects, making them an excellent first option for managing mild to moderate allergies.

Decongestants and Combination Products

Decongestants work alongside antihistamines to relieve nasal congestion by narrowing blood vessels in nasal passages. Popular decongestant ingredients include pseudoephedrine and phenylephrine, available in Australian pharmacies. Many antiallergic products combine antihistamines with decongestants for comprehensive symptom relief.

Products like Drixine and Otrivin provide effective nasal decongestion, whilst combination tablets address multiple symptoms simultaneously. Decongestant nasal sprays offer rapid relief, typically working within minutes, though they shouldn’t be used for more than three to five consecutive days to avoid rebound congestion. Oral decongestants take longer to work but last longer and don’t carry the rebound risk.

Combination products like Telfast-D combine antihistamine with decongestant action, providing comprehensive allergy relief in one tablet. These are particularly useful during peak allergy season when multiple symptoms occur together. Decongestants can increase heart rate and blood pressure, so they’re not suitable for everyone, particularly those with hypertension or heart conditions. Always read product labels carefully and follow dosage instructions. Decongestants work best for temporary relief rather than long-term management, and you shouldn’t exceed recommended doses. Combining different decongestant products risks overdosing, so use only one product containing decongestants at a time.

Corticosteroid Nasal Sprays and Topical Options

Corticosteroid nasal sprays are highly effective antiallergic medications that reduce inflammation in nasal passages, addressing the root cause of congestion and sneezing. Available Australian options include Nasonex (mometasone), Flixonase (fluticasone), and Avamys (fluticasone furoate). These sprays work best when used regularly, even before allergy season begins, as they prevent rather than just treat symptoms.

Corticosteroid sprays take a few days to reach full effectiveness, so they’re ideal for planned allergy management. They provide longer-lasting relief than antihistamines alone and work well for moderate to severe nasal symptoms. Topical antiallergic options extend beyond nasal sprays to include eye drops and skin creams. Antiallergic eye drops like Alomide provide relief from itchy, watery eyes caused by allergies. These drops often contain sodium cromoglicate or antihistamines specifically formulated for ocular use.

Hydrocortisone creams address allergic skin reactions, reducing itching and inflammation in affected areas. Combination therapy using both nasal sprays and oral antihistamines often provides superior relief compared to either treatment alone. Corticosteroid nasal sprays have excellent safety profiles when used as directed, with minimal systemic absorption. They’re suitable for long-term use throughout allergy season without concern about tolerance development.

Mast Cell Stabilisers and Prescription Options

Mast cell stabilisers prevent allergic reactions by stopping mast cells from releasing histamine and other inflammatory chemicals. Sodium cromoglicate, available in Australia as Intal, is a popular mast cell stabiliser used for allergies and asthma. These medications work best when used preventatively before allergen exposure rather than treating existing symptoms.

Mast cell stabilisers are particularly useful for people with exercise-induced allergies or specific environmental triggers. They work well for allergic asthma, hay fever, and food allergies. Prescription antiallergic options include stronger medications for severe allergies not controlled by over-the-counter treatments. Montelukast (Singulair) is a leukotriene receptor antagonist that reduces inflammation caused by allergens, effectively treating both allergic rhinitis and asthma. Omalizumab (Xolair) is a monoclonal antibody prescribed for severe allergic conditions, blocking IgE antibodies that trigger reactions.

Prescription antihistamines like desloratadine provide stronger relief for resistant allergies. These prescription options require doctor assessment to ensure appropriate use and monitoring. Some antiallergic medications combine multiple mechanisms, targeting histamine release, inflammation, and leukotriene production simultaneously. For severe allergies or anaphylaxis risk, epinephrine auto-injectors remain essential emergency treatments. Consulting your doctor helps identify which prescription antiallergic medication best suits your specific allergy type and severity.

Managing Allergies: Tips and Product Selection

Effective allergy management combines appropriate medication with practical strategies to minimise allergen exposure. Choose antiallergic products based on your specific symptoms—antihistamines for general allergies, nasal sprays for congestion, and eye drops for ocular symptoms. Starting with over-the-counter options is sensible for mild allergies, progressing to prescription medications if needed.

Keep a symptom diary to identify your specific allergens and seasonal patterns, helping you plan preventative treatment timing. During high pollen seasons, keep windows closed, wear sunglasses outdoors, and shower after spending time outside. Regular vacuuming with HEPA filters, washing bedding frequently, and using air purifiers reduce household allergen levels. Avoid rubbing itchy eyes, which worsens irritation and increases histamine release.

Store antiallergic medications at room temperature away from moisture and direct sunlight. Check expiration dates regularly, as expired medications lose potency. Some Australians find combination therapy most effective—using a daily nasal spray with occasional antihistamine tablets as needed. Tolerance to antiallergic medications rarely develops, so you can safely use them throughout allergy season. If standard treatments prove ineffective, consult your pharmacist or doctor about alternative options. Immunotherapy, including allergy shots or tablets, offers long-term relief for severe allergies by gradually desensitising your immune system. Regular review of your antiallergic management strategy ensures optimal symptom control and improved quality of life.