Claritin (Loratadine): Comprehensive Guide for Australian Patients
Basic Product Information
- International Non-proprietary Name (INN): Loratadine
- Australia Brand Names: Claritin®, Zyrtec-Loratadine®, Lorastyne®, Apo-Loratadine®, Chemists’ Own Loratadine®, numerous generics
- ATC Code: R06AX13
- Available Forms & Strengths:
- Tablets: 10mg loratadine
- Oral solution/syrup: usually 1mg/mL (120mL and 200mL bottles)
- Chewable tablets: 5mg and 10mg (children)
- Manufacturers: Bayer Australia, Apotex, Aspen Pharma, and various other TGA-registered companies.
- Prescription Status: Pharmacy Medicine (S2) – available without prescription from pharmacists for adults and children over two years old.
Mechanism of Action
For Everyone: Claritin (loratadine) is a “non-drowsy” antihistamine. It helps to relieve allergy symptoms like sneezing, runny nose, itchy or watery eyes, and itchy skin by blocking the action of histamine, a substance your body releases during allergic reactions.
For Healthcare Professionals: Loratadine is a long-acting tricyclic antihistamine with selective peripheral H1-receptor antagonist activity. It inhibits the vasodilation, increased capillary permeability, and sensory nerve stimulation caused by endogenous histamine but does not significantly cross the blood-brain barrier, minimising CNS effects.
Pharmacokinetics
- Absorption: Rapidly and well absorbed from the gastrointestinal tract. Peak plasma concentrations are reached in 1 – 2.5 hours (parent compound).
- Metabolism: Extensively metabolised in the liver (mainly by CYP3A4 and CYP2D6) to an active metabolite (desloratadine).
- Elimination: Excreted mainly via urine (40%) and faeces (40%) as metabolites. Terminal half-life: 8 – 14 hours for loratadine; active metabolite up to 28 hours.
- Duration of Action: Antihistamine effects persist for at least 24 hours.
Claritin Use in Everyday Life & Best Practices
Claritin is a popular choice across Australia for allergic rhinitis (“hay fever”) and mild skin allergies. Its main advantages are once-daily dosing, very low risk of drowsiness, and suitability for adults and children (over 2 years).
- Typical adult dose: 10mg (1 tablet) once daily.
- Children 2–12 years (bodyweight over 30kg): 10mg once daily.
- Children 2–12 years (bodyweight under 30kg): 5mg once daily (divided dose or paediatric formulation).
Take Claritin at the same time each day for steady symptom relief. Store at room temperature (below 25°C), away from moisture and direct sunlight.
Always read the label and follow instructions from your pharmacist or doctor. Do not exceed the recommended dose.
Dosing in the Morning vs Evening
Loratadine can be taken in the morning or evening. It is “non-drowsy,” so most people choose morning. Advantages of morning dosing include predictable daily symptom relief for outdoor activities and lower risk of forgetting your dose.
- Morning dose: Best for daytime allergy symptoms (e.g., pollen allergy, grass, outdoor triggers).
- Evening dose: Consider for night-time symptoms or if you often forget in the morning. Some people prefer evening use to avoid daytime side effects (rare).
- Tip: Set a daily reminder if you have trouble remembering!
Taking with Food or on an Empty Stomach
Claritin can be taken regardless of meals. Food may slightly delay absorption but does not affect overall effectiveness. In Australia, common breakfast and dinner options are all compatible with loratadine; there are no known interactions with typical English or multicultural diets.
- Take with a glass of water.
- Avoid high-fat meals if you notice mild digestive discomfort.
- No special dietary restrictions required.
Interaction Warnings
| Substance | Interaction | Advice |
|---|---|---|
| Alcohol | No significant interactions – but may enhance rare sedative effects | Avoid excess alcohol if sensitive to drowsiness |
| Ketoconazole, erythromycin, cimetidine | May increase loratadine levels (enzyme inhibition) | Use with caution; usually safe at recommended doses |
| Other antihistamines | Cumulative effects, no extra benefit | Do not combine without medical advice |
| St John’s Wort | May reduce loratadine effect (enzyme induction) | Inform your doctor if using herbal medicines |
| Grapefruit Juice | May interfere with metabolism (rare clinical significance) | Occasional consumption is unlikely to matter |
- Inform your pharmacist of all your medicines, including over-the-counter and natural products.
- Loratadine does not interact with common foods in the English/Australian diet.
Indications
| Indication | Approved Use? | Notes |
|---|---|---|
| Allergic rhinitis (perennial/seasonal) | Yes | Hay fever, year-round or spring/summer allergies |
| Chronic idiopathic urticaria (hives) | Yes | Reduces itching and swelling |
| Other allergy symptoms (off-label) | Occasional | At doctor’s discretion (e.g., mild conjunctivitis) |
| Asthma (sole therapy) | No | Not effective for asthma or severe allergies |
Dosing According to Clinical Indications
| Group | Indication | Recommended Dose | Comments |
|---|---|---|---|
| Adults & children ≥30kg | Allergic rhinitis, urticaria | 10mg once daily | Tablet or syrup |
| Children 2–12 years <30kg | Allergic rhinitis, urticaria | 5mg once daily | Oral solution preferred |
| Elderly | All indications | Start with 5mg–10mg once daily | Assess risk of kidney/liver impairment |
| Renal/hepatic impairment | All indications | 5mg once daily or alternate days | Supervision required |
Safety Profile & Side Effects
- Claritin is generally very well tolerated. Most people experience no side effects at all.
- Common (may affect up to 1 in 100):
- Headache
- Tiredness (fatigue)
- Dry mouth
- Mild gastrointestinal symptoms (nausea)
- Uncommon or Rare:
- Drowsiness (less than 2%)
- Increased appetite
- Allergic reactions (rash, swelling – very rare)
- Tachycardia/heart palpitations (very rare in susceptible people)
- Warnings:
- Use with caution if you have severe liver or kidney problems.
- Safety in pregnancy is not fully established; consult a doctor before use.
- Very limited data for use while breastfeeding.
| Side Effect | Frequency | Action |
|---|---|---|
| Drowsiness | Uncommon (<2%) | Avoid driving if affected |
| Headache | Common | Usually mild, responds to paracetamol |
| Allergic reaction | Very rare | Seek urgent medical attention |
Guidelines for Proper Use (Practical Tips)
- Claritin is safe for most adults and children over 2 years.
- Do not use doses higher than recommended without medical advice.
- If you miss a dose, take it as soon as remembered. Do not double up to make up for missed tablets.
- If allergic symptoms persist or worsen, seek advice from your pharmacist or GP.
- If used for seasonal allergies (“hay fever”), start treatment 1–2 weeks before the expected pollen season for best effect.
- Loratadine is non-sedating, so driving and operating machinery is generally safe. However, monitor individual response, especially in the first days.
- Report any severe or unexpected side effects promptly.
Alternative Treatment Options
- Cetirizine (Zyrtec® and generics): Also non-sedating but may cause drowsiness in some people. Effective for nasal and skin allergies.
- Fexofenadine (Telfast®): True non-drowsy antihistamine. Good choice for people with higher sensitivity to drowsiness. Similar efficacy.
- Promethazine (Phenergan®): Sedating, used if night-time sleep disturbance from allergies. Prescription-only.
- Intranasal corticosteroids (e.g., fluticasone, budesonide): First-line for moderate/severe hay fever, but require regular use. Non-sedating.
- Leukotriene antagonists or immunotherapy: Specialist-prescribed, for specific or resistant cases.
The above medications are available under the Pharmaceutical Benefits Scheme (PBS) for some indications. Loratadine, cetirizine, and fexofenadine are all available without prescription for general allergy relief.
Legal, Registration, and Reimbursement Status in Australia
- Regulator: Therapeutic Goods Administration (TGA); all brands with loratadine must have TGA approval.
- Schedule: S2 (Pharmacy Medicine), available without prescription. Restricted for children under two years unless prescribed.
- Reimbursement: Not routinely subsidised via the PBS for over-the-counter antihistamine use, except in special cases (e.g., chronic urticaria in children; hospital-restricted supply).
- Mandatory labelling and warnings apply as per Australian legislation.
Latest Research and Clinical Guidance (2022–2025)
- Recent English and Australian guidelines continue to recommend non-sedating antihistamines (like loratadine) as first-line for most patients with allergic rhinitis and mild urticaria (Australian Prescriber, 2023; Royal Australasian College of Physicians [RACP], 2024).
- Meta-analyses confirm loratadine’s safety and efficacy profile is highly favourable, especially for children and the elderly (BMJ, 2022).
- Cochrane reviews show that daily use offers more consistent symptom relief than "as needed" use, with very low risk of drowsiness or cognitive impairment.
- Non-pharmaceutical measures (pollen avoidance, nasal saline irrigation) are complementary but loratadine remains a cornerstone of "stepwise" allergy care.
See: NPS MedicineWise Loratadine | TGA medicines guidance
Availability and Delivery Details
Loratadine (Claritin and generics) is stocked at almost all Australian pharmacies, supermarkets, and online chemists. Common pack sizes and indicative pricing:
| Form & Pack Size | RRP (AUD) | Delivery (Major Cities) |
|---|---|---|
| 10mg tablets, 10-pack | $7 – $12 | Same/next-day (Sydney, Melbourne, Brisbane, Perth, Adelaide) |
| 10mg tablets, 30-pack | $14 – $22 | Usually same/next-day |
| Liquid (120mL, 1mg/mL) | $12 – $17 | 1–2 working days |
- Delivery to most regional and remote areas takes 2–5 days via Australia Post or courier.
- Online purchase requires age declaration and pharmacist consultation for under 12 years.
Frequently Asked Questions (FAQ)
- Can I use Claritin for year-round allergies?
Yes, it is suitable for ongoing (perennial) allergies as well as seasonal hay fever. Take daily for continuous relief. - Will Claritin make me drowsy?
Loratadine is classified as a non-sedating antihistamine, so drowsiness is rare. Some sensitive people may notice slight tiredness. Avoid driving if you feel sleepy. - Is it safe to use in pregnancy or breastfeeding?
There are limited data. Best to consult your GP or pharmacist before use if you are pregnant or breastfeeding. - Does Claritin work immediately?
It usually starts to work within 30–60 minutes. Full relief can take a few hours, especially for severe symptoms. - Can I take other allergy medicines at the same time?
Do not combine antihistamines without talking to your pharmacist or doctor. Nasal sprays or eye drops can often be used with loratadine.
Need more advice? Speak to your community pharmacist, GP, or visit Healthdirect Australia for trusted information.
