Prevacid (Lansoprazole) – Comprehensive Patient Information for Australia
Basic Product Information
| International Nonproprietary Name (INN) | Lansoprazole |
|---|---|
| Common Brand Names (Australia) | Prevacid, Zoton, Zoton FasTabs |
| Anatomical Therapeutic Chemical (ATC) Code | A02BC03 |
| Available Forms & Strengths | Capsules (15 mg, 30 mg), Orodispersible tablets (15 mg, 30 mg) |
| Manufacturers (Australia) | Pfizer Australia, Alphapharm, Apotex, Sandoz, Mylan |
| Prescription Status | Prescription Only Medicine (Schedule 4 / S4) |
Mechanism of Action
For Patients: Lansoprazole belongs to a group of medicines called "proton pump inhibitors" (PPIs). It works by reducing the amount of acid your stomach makes. By lowering stomach acid, it helps relieve symptoms related to acid reflux, heartburn, and ulcers.
For Specialists: Lansoprazole inhibits the H+/K+ ATPase enzyme system—known as the ‘proton pump’—in the parietal cells of the stomach lining. This action is irreversible and suppresses gastric acid secretion (both basal and stimulated). Clinical efficacy and acid suppression are comparable to omeprazole and other PPIs.
Pharmacokinetics
- Absorption: Rapid after oral administration; peak plasma concentration (Tmax) reached in 1-2 hours.
- Bioavailability: 80–90% after oral dosing. Slightly increased by fasting.
- Metabolism: Extensively metabolised by cytochrome P450 enzymes (mainly CYP2C19 & CYP3A4) in the liver.
- Elimination: Mainly renal (kidneys); minor fecal route. Plasma half-life: 1–2 hours, though acid suppressant effect lasts 24+ hours.
- Duration of Action: Effective suppression for 24+ hours despite short plasma half-life.
Use in Everyday Life & Best Practices
Lansoprazole is used for treating a variety of acid-related stomach conditions in daily life in Australia, including:
- Gastro-oesophageal reflux disease (GORD/GERD)
- Peptic ulcers (stomach, duodenal)
- Prevention/treatment of NSAID-associated ulcers
- Zollinger-Ellison syndrome
- Helicobacter pylori eradication (as part of combination therapy)
In Australia, patients typically receive lansoprazole as a once-daily capsule or orodispersible tablet. It should be taken at the same time each day, preferably in the morning before breakfast for best results. Consistency improves symptom control.
Dosing: Morning vs Evening
- Best practice: Take in the morning, 30–60 minutes before food. This times the drug's peak effect with the body's maximum acid production, offering better symptom relief.
- Evening dosing: May be considered if symptoms are predominantly nocturnal, though less common.
- Tips: Try to take your dose around the same time daily. Setting a phone reminder or pairing dosing with a daily routine (like breakfast) can help.
Taking With Food or on an Empty Stomach
Lansoprazole is best absorbed when taken on an empty stomach, ideally 30–60 minutes before eating. Foods typical to the Australian diet such as cereal, toast, or fruit can delay absorption and lower effectiveness if taken together. Try to wait before having your brekky after taking lansoprazole.
Orodispersible (FasTabs) may be allowed without water and can be especially useful for patients who struggle to swallow capsules.
Interaction Warnings
| Type of Interaction | Examples | Advice |
|---|---|---|
| Medicines | Warfarin, digoxin, methotrexate, HIV protease inhibitors, itraconazole, tacrolimus, clopidogrel | May affect blood levels or effectiveness. Inform your doctor/pharmacist about all medicines you take. |
| Food | Milk, cheese, fatty foods, wheat-based breakfast cereals | Delay absorption. Take on empty stomach for best results. |
| Alcohol | Beer, wine, spirits | Does not directly interact, but alcohol can worsen stomach symptoms and is best avoided in excess. |
| Antacids | Aluminium/magnesium hydroxide, Gaviscon | May be used, but separate from lansoprazole dose by at least 1 hour. |
Indications
| Indication | Registered in Australia? | Notes |
|---|---|---|
| Treatment of GORD/GERD | Yes | Standard and maintenance therapy |
| Peptic ulcer disease (gastric/duodenal) | Yes | Short-term healing and maintenance |
| Helicobacter pylori eradication (with antibiotics) | Yes | Part of triple therapy |
| Zollinger-Ellison syndrome | Yes | Rare, specialist use |
| Prevention of NSAID-induced ulcers | Yes | For patients at risk due to chronic NSAID use |
| Off-label: Eosinophilic oesophagitis, dyspepsia, others | Yes (off-label) | At doctor’s discretion |
Dosing According to Clinical Indication
| Indication | Adults (Typical Dose) | Paediatrics (Typical Dose) | Elderly |
|---|---|---|---|
| GORD / GERD | 30 mg once daily for 4-8 weeks; maintenance 15–30 mg once daily | 15 mg once daily (children >1 year & >30 kg); consult paediatrician | Use adult doses; monitor for side effects, dose adjustments if renal/hepatic impairment |
| Peptic ulcer | 30 mg once daily for 4 weeks (duodenal) or 8 weeks (gastric) | Not routinely recommended | As above |
| H. pylori eradication (triple therapy) | 30 mg twice daily + 2 antibiotics for 7 days | Specialist advice | As above |
| Zollinger-Ellison syndrome | 60 mg once daily (sometimes higher), titrated by response | Specialist only | As above |
| Prevention of NSAID ulcers | 15–30 mg once daily | Consult specialist | As above |
Safety Profile & Side Effects
| Frequency | Side Effects |
|---|---|
| Common (≥1%) | Headache, diarrhoea, constipation, nausea, abdominal pain, dizziness, rash |
| Uncommon (0.1–1%) | Dry mouth, vomiting, joint pain, sleep disturbances |
| Rare (<0.1%) | Severe allergic reactions (anaphylaxis), liver effects, low blood magnesium (may cause cramps, seizures), rash/skin reactions (SJS/TEN) |
| Warnings | Long-term use may increase risk of bone fractures, B12 deficiency, or gut infections (eg. Clostridium difficile) |
Guidelines for Proper Use (Australia)
- Take lansoprazole as directed by your doctor or pharmacist, preferably each morning before eating.
- Swallow capsules whole, do not crush or chew. Orodispersible tablets can be dissolved on the tongue.
- Keep regular appointments with your GP for review—long-term PPI use should be reassessed regularly due to emerging risks.
- Let your pharmacist know about all other medicines, vitamins, or supplements you take.
- Tell your doctor if you notice black stools, significant weight loss, swallowing difficulties, chest pain, or persistent vomiting.
- Report any unusual or severe side effects immediately; pharmacists in Australia are equipped to triage these concerns.
- Store below 25°C, protect from humidity; do not use expired medicine.
Alternative Treatment Options (PBS-Listed)
- Other PPIs: Omeprazole, esomeprazole, pantoprazole, rabeprazole (all PBS reimbursed)
- H2 blockers: Ranitidine (note: not currently available due to regulatory action), famotidine
- Antacids and alginates: Gaviscon, Mylanta (for mild/occasional symptoms)
Comparative overview:
- All PPIs have similar efficacy for most conditions; differences are minor in day-to-day patient experience.
- PPIs are more effective than H2-receptor antagonists for healing or preventing ulcers and treating GORD.
- Antacids provide rapid but short-lived relief and are not substitutes for regular therapy in chronic conditions.
- Lansoprazole’s orodispersible form is an advantage for those who have difficulty swallowing capsules.
Legal, Registration, and Reimbursement Status in Australia
- Registration: Approved by the Therapeutic Goods Administration (TGA) for use as a prescription medicine.
- Prescription requirements: S4 – Prescription Only; GPs, specialists, and authorised nurse practitioners can prescribe.
- Reimbursement: Listed on the Pharmaceutical Benefits Scheme (PBS) for approved indications (e.g., GORD, ulcer prevention, H. pylori eradication).
- Supply: Available from community and hospital pharmacies upon presentation of a valid prescription.
- Monitoring: Long-term/maintenance use may require review as per national consensus (RACGP guidelines, 2022–2024).
Latest Research & Clinical Guidance (2022–2025)
- Recent Australian guidelines emphasize step-down therapy for PPIs: lowest effective dose or intermittent/‘on demand’ therapy once symptoms are controlled, to minimise long-term risks (see: RACGP 2022).
- A meta-analysis (Ahmadizar et al., 2022) found lansoprazole equally effective to other PPIs for GORD and ulcer healing.
- Long-term PPI use has been associated with small increases in fracture risk, chronic kidney disease, and certain infections, but absolute risks for most patients remain low and can be managed with regular review (RACGP, 2023, World Gastroenterology Organisation, 2024).
- Current evidence recommends periodic review for ongoing need, especially in elderly patients, and lifestyle measures (weight loss, diet adjustment) alongside PPI therapy.
- PBS continues to support subsidised prescriptions for eligible patients, with stricter enforcement of step-down for maintenance therapy (DoH, 2024).
Availability and Delivery
| Pack Size | Form/Strength | Indicative PBS Price* | Typical Delivery Time (Sydney) | Typical Delivery Time (Melbourne) | Typical Delivery Time (Brisbane) | Typical Delivery Time (Perth) | Typical Delivery Time (Adelaide) |
|---|---|---|---|---|---|---|---|
| 28 capsules | 30 mg | $22.37 (PBS concessional: $7.30) | 1 business day | 1–2 business days | 2 business days | 3–5 business days | 2 business days |
| 30 orodispersible tablets | 15 mg | $18.20 (PBS concessional: $7.30) | 1 business day | 1–2 business days | 2 business days | 3–5 business days | 2 business days |
*Prices may vary by pharmacy, brand, and patient eligibility. Check with your local pharmacy for latest details.
FAQ – Frequently Asked Questions
- 1. When should I take lansoprazole, and can I take it with breakfast?
Lansoprazole works best when taken in the morning on an empty stomach, about 30–60 minutes before food. Wait until after your dose before having breakfast. - 2. I forgot my dose. What should I do?
Take it as soon as you remember, unless it is almost time for your next dose. Do not double up doses; just continue as normal. - 3. Can I stop taking lansoprazole suddenly?
It’s best to consult your GP before stopping. Sudden discontinuation may cause rebound acid symptoms. Tapering or switching to ‘as needed’ can be considered under medical supervision. - 4. Are there any foods or drinks I should avoid?
No specific foods must be avoided, but excessive alcohol, spicy or fatty foods, and large late-night meals can aggravate symptoms. A balanced Australian diet is recommended. - 5. Is lansoprazole safe in pregnancy or breastfeeding?
Consult your doctor. While some PPIs have been used in pregnancy, a careful assessment is needed as safety data is limited; alternatives or dose adjustments may be advised.
