Meclizine Hydrochloride – Patient Information for Australia
Basic Product Information
| Active Ingredient (INN) | Meclizine Hydrochloride |
|---|---|
| Australia Brand Names | Antivert, Bonine, Travelcalm, SeaLegs* |
| ATC Code | N07CA03 |
| Available Forms and Strengths | Tablets: 12.5 mg, 25 mg, 50 mg; Chewable tablets: 25 mg* |
| Manufacturers | Pfizer Australia, Apotex, Arrow Pharma, Sandoz |
| Prescription Status | Pharmacist Only Medicine (Schedule 3) – available without prescription but supplied only by pharmacists after consultation. |
Mechanism of Action
In Simple Terms: Meclizine reduces symptoms of nausea, dizziness, and motion sickness by blocking signals in the brain responsible for vomiting and balance.
For Specialists: Meclizine is a first-generation antihistamine (H1-receptor antagonist) with antiemetic and anticholinergic (muscarinic receptor-blocking) properties. It dampens vestibular stimulation at the inner ear and depresses labyrinth excitability, interfering with the transmission of impulses from the vestibular nuclei to the chemoreceptor trigger zone.
Pharmacokinetics
- Absorption: Rapid and well-absorbed from the gastrointestinal tract, peak plasmas reached within 1-4 hours.
- Metabolism: Primarily hepatic via CYP2D6 enzyme system.
- Elimination: Urine (as metabolites), half-life approx. 5–6 hours, effects lasting up to 24 hours.
- Duration of action: Symptom relief for 8–24 hours depending on dose and patient characteristics.
Use in Everyday Life and Best Practices
- Motion Sickness: Take 30–60 minutes before travel. Repeat every 24 hours if needed.
- Vertigo/Balance Disorders: Used as directed by your GP or specialist, often once daily.
- Travel in Australia: Especially useful for long road trips, cruises, or flights. Accessible at most urban/community pharmacies.
- Driving, Work, and Activities: Causes drowsiness—avoid driving, cycling, or operating machinery until you know your reaction.
Dosing in the Morning vs Evening
Taking in the Morning:
- Best for preventing travel sickness before a journey.
- May cause drowsiness—caution if you need to be alert during the day.
- Useful for vertigo symptoms that disturb sleep; may improve rest.
- Reduces interference with daily activities due to sedative effect.
Taking with Food or on an Empty Stomach
- Meclizine can be taken with or without food.
- Taking with food or a light meal may reduce the risk of stomach upset, which is uncommon.
- No significant interaction with typical Australian dietary patterns (e.g., meals with dairy, grains, protein).
Interaction Warnings
| Substance | Interaction | Advice |
|---|---|---|
| Alcohol | Increases drowsiness, dizziness | Avoid alcohol during treatment |
| Other sedatives (benzodiazepines, sleeping tablets) | Heightened central sedation | Only under supervised medical advice |
| Anticholinergic medicines (e.g., some antidepressants, antipsychotics) | Cumulative dry mouth, blurred vision, constipation, confusion in elderly | Monitor closely, inform your doctor/pharmacist |
| Metoclopramide/Prochlorperazine | May counteract each other's effect | Avoid simultaneous use unless directed |
| Grapefruit/Juice | Poorly studied, but may affect metabolism | Best avoided |
Indications
| Official (TGA-Approved) | Off-Label |
|---|---|
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Dosing According to Clinical Indications
| Indication | Adults | Children (over 12 years) | Elderly |
|---|---|---|---|
| Motion Sickness (Prevention & Relief) | 25–50 mg 1 hour before travel, repeat 24 hourly if needed | 12.5–25 mg as above (use with caution; check pharmacist guidance) | Begin with lowest adult dose; monitor for increased side effect risk |
| Vertigo | 25–100 mg per day in divided doses (as advised by doctor) | Not recommended unless directed by paediatric specialist | Sensitivity increased—start low, go slow, monitor for confusion/drowsiness |
Safety Profile and Side Effects
| Common Side Effects (≥1%) | Uncommon/Rare Side Effects (<1%) | Serious Warnings |
|---|---|---|
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If you experience difficulty breathing, swelling of the face/throat, severe dizziness, or confusion—seek immediate medical attention.
Guidelines for Proper Use
- Only use as needed to control symptoms, or as directed by your healthcare professional.
- Do not exceed recommended dose.
- Store below 25℃, out of sunlight and reach of children.
- Inform pharmacist/doctor if you have glaucoma, enlarged prostate, asthma, or allergies to antihistamines.
- Check if safe in pregnancy or breastfeeding—generally, an alternative may be preferred.
- Do not use expired medicines; return unused tablets to your community pharmacy for safe disposal (in line with Australia’s Return Unwanted Medicines Project).
Alternative Treatment Options
- Hyoscine hydrobromide (Kwells, Scopoderm): Equally effective for motion sickness, short half-life, more anticholinergic side effects. Available OTC.
- Cinnarizine: Not currently marketed in Australia.
- Promethazine (Phenergan): Similar efficacy for nausea, more sedating, stricter prescription control.
- Non-drug options: Ginger tablets/capsules, acupressure wristbands, controlled exposure/pre-trip preparation; limited but supporting evidence.
- Reimbursement: Most over-the-counter options are not reimbursed by Medicare or PBS in Australia; prescribed alternatives for long-term vertigo may be subsidised if meeting PBS criteria.
Legal, Registration, and Reimbursement Status in Australia
- TGA-registered and regulated: Australian Register of Therapeutic Goods (ARTG)
- Schedule 3 (Pharmacist Only Medicine): Available without prescription after direct pharmacist consultation
- Subsidy: Not reimbursed by the Pharmaceutical Benefits Scheme (PBS) for over-the-counter indications
- Private prescription for chronic/prolonged vertigo may be covered when prescribed in specialist settings; check specific case with your GP or hospital pharmacy.
Latest Research and Clinical Guidance (2022–2025)
- Recent Cochrane Review (2023) on antiemetics for motion sickness showed Meclizine remained a first-line choice for adults with minimal serious side effects. Read summary
- RACGP guidelines indicate Meclizine (and related agents) as preferred for patients with mixed vertigo/nausea, particularly for travel or inner ear infection-related dizziness.
- Australian Medicines Handbook (AMH 2024) — Meclizine advised for brief, intermittent prevention due to sedation; caution in elderly and chronic dosing due to cognitive risk.
- No new major safety concerns reported in 2024 TGA Pharmacovigilance updates.
Availability and Delivery
| Pack Size | Typical Price (AUD, 2024) | Indicative Delivery Time (Business Days) |
|---|---|---|
| 10 Tablets (25 mg) | $8 – $12 | Sydney: Same/next day, Melbourne: 1–2 days, Brisbane: 2–3 days, Perth: 3–6 days, Darwin/Hobart: 2–5 days |
| 25 Tablets (25 mg) | $15 – $22 | As above for all major cities. Regional/rural: add 1–2 days |
| 50 Tablets (25 mg, bulk) | $30 – $40 | As above |
Frequently Asked Questions (FAQ)
1. Can I use Meclizine if I am pregnant or breastfeeding?
Meclizine is generally not recommended in pregnancy or breastfeeding unless prescribed by your doctor. Alternative remedies may be safer – ask your pharmacist or GP for advice.
2. Will Meclizine make me sleepy?
Drowsiness is a common side effect. Do not drive, operate machinery, or cycle after your first dose until you know how you react.
3. Can I drink alcohol while taking Meclizine?
Alcohol can increase the sedative effects of Meclizine and may make side effects worse. Avoid alcohol during treatment.
4. Is it safe for children?
Meclizine is not approved for children under 12 years unless prescribed by a paediatric specialist. For older children/teens, ask your pharmacist about the safest option and correct dose.
5. How quickly does Meclizine work?
Meclizine usually takes effect within 30–60 minutes after taking a dose, providing symptom relief for up to 24 hours depending on your body and the specific indication.
For more individual advice, consult your pharmacist or doctor. This information is provided for Australia and may differ in other countries.
