Zestoretic (Lisinopril / Hydrochlorothiazide): Patient Information for Australia
Basic Product Information
| International Non-proprietary Name (INN) | Lisinopril / Hydrochlorothiazide |
|---|---|
| Australia Brand Names | Zestoretic, Lisinopril Plus, Lisinopril/HCTZ generics |
| ATC Code | C09BA03 |
| Available Forms and Strengths | Tablets: 10 mg/12.5 mg, 20 mg/12.5 mg (Lisinopril/Hydrochlorothiazide) |
| Manufacturers | AstraZeneca, Apotex, generic suppliers |
| Prescription Status | Prescription only (Schedule 4, S4 medicine) |
Mechanism of Action
- In Simple Terms: Zestoretic works by relaxing your blood vessels and helping your body get rid of extra salt and water. This together helps lower your blood pressure and reduce strain on the heart.
- For Specialists: Lisinopril is an angiotensin-converting enzyme (ACE) inhibitor that blocks the conversion of angiotensin I to angiotensin II, resulting in vasodilation, reduced aldosterone secretion, and decreased blood pressure. Hydrochlorothiazide is a thiazide diuretic, increasing sodium and chloride excretion in the distal convoluted tubules of the kidney, leading to diuresis and reduced plasma volume.
Pharmacokinetics
- Absorption: Lisinopril is slowly absorbed (bioavailability: approx. 25%; unaffected by food). Hydrochlorothiazide is rapidly absorbed (approx. 60–80%).
- Metabolism: Lisinopril is not metabolised and is excreted unchanged; hydrochlorothiazide is minimally metabolised.
- Elimination: Both medicines are excreted mainly in the urine.
- Half-life: Lisinopril: 12 hours; Hydrochlorothiazide: 6–15 hours.
- Duration of Action: Around 24 hours for once-daily dosing.
Use in Everyday Life and Best Practices
Zestoretic is typically prescribed for people whose blood pressure is not adequately controlled by a single medication. In Australia, it’s commonly used for high blood pressure (hypertension), and sometimes in heart failure, on your doctor’s advice.
Typical Doses:
- Starting dose: 1 tablet (10 mg/12.5 mg) once daily
- Maintenance dose: 1 tablet (20 mg/12.5 mg) once daily, if required
- Maximum recommended dose: 1 tablet (20 mg/12.5 mg) once daily
Always take your dose as advised by your doctor, and don’t adjust the amount without medical guidance.
Dosing in the Morning vs Evening
- Most patients are advised to take Zestoretic in the morning. Hydrochlorothiazide increases urination, so morning dosing helps avoid needing the toilet at night.
- Try to take your medicine at the same time each day to help you remember.
- If you forget a dose and it’s late in the day, skip that dose and resume your schedule the next day (unless your doctor advises otherwise).
Taking With Food or on an Empty Stomach
- Zestoretic can be taken with or without food—meals do not affect its absorption. This fits in well with most Australian diets and lifestyles.
- If you experience stomach upset, you may prefer to take it with breakfast or a light meal.
- Stay hydrated and follow general dietary advice for blood pressure (e.g. moderate salt intake, balanced fruit/veg, typical healthy eating guidelines in Australia).
Interaction Warnings
Some foods, drinks, and medications may interact with Zestoretic. Tell your pharmacist or doctor about all medicines, supplements, or remedies you take.
| Interaction | What Happens | Advice |
|---|---|---|
| Potassium supplements / salt substitutes | Raised potassium levels (hyperkalaemia) | Avoid unless prescribed |
| Other blood pressure medicines (e.g. ARBs, beta-blockers) | May overly reduce blood pressure | Doctor may adjust doses |
| NSAIDs (e.g. ibuprofen, naproxen) | Reduced kidney function, may blunt BP-lowering effect | Use short-term only, if needed |
| Alcohol | Risk of low blood pressure, dizziness | Limit alcohol intake |
| Lithium | Unsafe lithium levels | Not usually used together |
| Corticosteroids or diuretics | Low potassium, low blood pressure | Medicinal review required |
| Diabetes medicines (insulin, metformin, etc.) | Altered blood glucose levels | Extra monitoring recommended |
Indications
| Indication | Notes |
|---|---|
| Essential hypertension (high blood pressure) | Main approved use, especially where single drugs are not sufficient |
| Heart failure (off-label use) | In select stable patients and only under specialist advice |
| Diabetic nephropathy (off-label use) | May be considered where blood pressure control improves kidney protection |
Dosing According to Clinical Indications
| Group | Indication | Recommended Dose | Comments |
|---|---|---|---|
| Adults | Hypertension | 10 mg/12.5 mg once daily, up to 20 mg/12.5 mg once daily | Start with lowest dose; titrate as required |
| Elderly (over 65 years) | Hypertension | Same as adults, but start low and increase slowly | Monitor kidney function, risk of dehydration |
| Pediatrics (<18 years) | Not recommended | Not approved use in Australia | Alternative therapy advised |
Safety Profile & Side Effects
Zestoretic is generally well-tolerated, but may cause side effects. Contact your doctor or pharmacist if you are concerned.
| Side Effect Type | Examples |
|---|---|
| Common (1–10%) |
|
| Uncommon (0.1–1%) |
|
| Rare (<0.1%) or Serious |
|
- Warnings: Report persistent cough, unexplained muscle pain or weakness, irregular heartbeat, signs of dehydration, or severe allergic reactions.
- Routine blood tests may be needed to monitor kidney function, electrolytes, and blood pressure.
Guidelines for Proper Use
- Take Zestoretic exactly as prescribed by your doctor; do not stop suddenly unless instructed.
- Sit or stand up slowly—especially when starting, to reduce dizziness or fainting.
- Keep hydrated, particularly during hot Australia weather or if you are exercising more than usual.
- If you develop diarrhoea, vomiting, or other conditions causing dehydration, consult your doctor.
- Inform any clinician or dentist treating you that you are taking Zestoretic.
- If you are planning surgery or procedures, mention Zestoretic to your anaesthetist.
- Store tablets in a cool, dry place away from sunlight and out of reach of children.
- Check expiry dates regularly and return unused/expired medicines to the pharmacy for safe disposal.
Alternative Treatment Options
- Monotherapies: ACE inhibitors (e.g. perindopril, ramipril), thiazide diuretics (e.g. hydrochlorothiazide alone, indapamide).
- Other fixed-dose combinations:
- Perindopril/Indapamide (Coversyl Plus, perindopril with a different diuretic)
- Losartan/Hydrochlorothiazide (ARB-based combination)
- Amlodipine/Perindopril (calcium channel blocker/ACE inhibitor)
| Drug/Option | Advantages | Disadvantages | PBS Subsidy? |
|---|---|---|---|
| Zestoretic (Lisinopril/HCTZ) | Effective, well-tolerated, single-tablet convenience | ACE inhibitor cough in some; not for all | Yes |
| Perindopril/Indapamide | Less cough, alternate diuretic for some patients | Not suitable for all, risk of low sodium | Yes |
| Losartan/HCTZ | Well tolerated, ARB-based (for ACE intolerance) | Less extensive data in some co-morbidities | Yes |
| Separate tablets (ACEi + diuretic) | Tailored dosing | More tablets, lower convenience | Yes |
Legal, Registration, and Subsidy Status in Australia
- Registered with: Therapeutic Goods Administration (TGA), AUSTRALIA
- Legal Classification: S4 (Prescription only)
- PBS Subsidy: Yes, for hypertension as per current (2024) Pharmaceutical Benefits Scheme (PBS) guidelines
- Availability: Most community pharmacies throughout Australia
- Supply: Up to 1 month per prescription, repeats allowed as per doctor's direction
Latest Research and Clinical Guidance (2022–2025)
- Recent position statements from the National Heart Foundation of Australia reinforce the use of fixed-dose combination antihypertensive therapies, such as Zestoretic, as cost-effective and beneficial for blood pressure control and medication adherence (2022–2024 guidelines).
- Meta-analyses (Lancet 2023; Australian Prescriber 2023) underline effective BP lowering and stroke risk reduction, especially when used as part of a holistic lifestyle and medication plan.
- The combination is also supported for elderly care provided regular monitoring for renal function and serum electrolytes is ensured (Heart Foundation AU, 2024).
Availability and Delivery in Australia
Zestoretic is widely available in most Australian towns and cities, via local and online pharmacies. Your pharmacist can guide you on supply and any generic options. Prices may vary by supplier and script status.
| Pack Size | Typical Price Range (with PBS) | Home Delivery (indicative) |
|---|---|---|
| 30 tablets (1 month) | $6.70 PBS concessional / $40.30 general | Express post (1–2 business days); Standard post (2–6 business days) |
| 90 tablets (by doctor script/repeats) | 3x monthly PBS copayment | Bulk and pharmacy collection options also available |
Indicative Home Delivery to Major Cities:
Sydney, Melbourne, Brisbane, Canberra – 1–2 working days (express)
Adelaide, Perth, Hobart, Darwin – 2–4 working days (express)
Frequently Asked Questions (FAQ)
- 1. What should I do if I miss a dose?
If it’s only a few hours late, take it as soon as you remember. If it’s nearly time for your next dose, skip the missed tablet and just take the next one at the usual time. Do not double the dose. Speak with your pharmacist for more support. - 2. Can I drink alcohol with Zestoretic?
Small amounts of alcohol are usually permitted, but alcohol can increase dizziness and lower your blood pressure. Drink responsibly and ask your healthcare provider if you have any concerns. - 3. Is Zestoretic safe during pregnancy or breastfeeding?
Zestoretic is not recommended in pregnancy or while breastfeeding. Women who are planning pregnancy or who become pregnant should discuss alternative blood pressure treatments with their doctor as soon as possible. - 4. How long will I need to take Zestoretic?
Most people take antihypertensive medication long-term, sometimes for life, to effectively control blood pressure and reduce risk of complications. Your doctor will regularly review your need for medication. - 5. Do I need regular blood tests?
Yes—kidney function and electrolyte levels (such as sodium and potassium) should be checked, especially when starting, changing dose, or if you have other medical problems.
