Ranexa (Ranolazine)

Ranexa (Ranolazine) – Patient Information for Australia

1. Basic Product Information

2. Mechanism of Action

For Patients: Ranexa works by improving blood flow to the heart muscle. Unlike many other chest pain medicines, it does this without affecting your heart rate or blood pressure significantly. Ranexa helps the muscle cells in your heart use oxygen more efficiently, making it easier for you to carry out daily activities with less chest discomfort.

For Specialists: Ranolazine selectively inhibits the late phase of the inward sodium current (late INa) in cardiac myocytes. This reduces intracellular sodium and subsequently decreases calcium overload mediated via the sodium-calcium exchange. The result is improved myocardial relaxation and reduced ventricular wall tension, particularly under ischaemic conditions, without appreciable effect on haemodynamics.

3. Pharmacokinetics

• Absorption: Ranolazine tablets are well-absorbed after oral administration, reaching peak plasma concentrations within 2–6 hours.
• Metabolism: Extensively metabolised in the liver and intestine, predominantly by CYP3A and, to a lesser extent, CYP2D6 enzymes.
• Elimination: The elimination half-life is approximately 7 hours. Metabolites are mainly excreted in urine (about 75%) and faeces (about 25%).
• Duration of Action: Steady-state plasma levels are typically reached after 3 days of twice-daily dosing.

4. Use in Everyday Life and Best Practices

Typical Use: Ranexa is used as a long-term treatment to reduce the frequency of angina (chest pain) attacks in adults with chronic stable angina, especially when other medicines are not sufficient or tolerated.

How to Take: Ranexa tablets should be swallowed whole with a glass of water, usually twice daily. Do not crush, chew, or split the tablets, as this can affect how the medicine is absorbed.

• Start with the lowest available strength (typically 375 mg) and increase gradually as directed by your doctor.
• The maximum recommended daily dose is 2,000 mg (usually 1,000 mg morning and night).
• Do not stop taking Ranexa without consulting your doctor, even if you feel well.
• Ranexa is usually prescribed in addition to other heart medicines such as beta-blockers, calcium channel blockers, or nitrates.

Driving and Machinery: Ranexa may cause dizziness, blurred vision, or headaches in some people. Take care before driving or operating machinery, especially when you first start treatment.

5. Dosing in the Morning vs Evening

• Dosage Timing: Ranexa is typically taken twice daily, at evenly spaced intervals (e.g., morning and evening, around 12 hours apart) to maintain steady levels.
• Advantages: Morning and evening dosing suits most Australian routines, supporting consistent medication adherence.
• Disadvantages: Missing doses reduces efficacy; aim to take doses at the same times each day. Use pillboxes or alarms to stay on track.
• Tips: Take with or soon after a meal or snack to reduce stomach upset, but avoid high-fat meals (see below).

6. Taking with Food or on an Empty Stomach

Ranexa can be taken with or without food. However, avoid high-fat meals as they can increase the amount of medicine absorbed, potentially increasing side effects. A typical English diet, consisting of balanced meals, is suitable for taking Ranexa.

• Try to take each dose at the same time each day, with your breakfast and dinner or another regular meal.
• If you have a sensitive stomach, taking Ranexa after food may help.
• Avoid grapefruit juice, as it can increase your risk of side effects.

7. Interaction Warnings

Always disclose all medicines and supplements to your pharmacist or doctor.

8. Indications (When Is Ranexa Used?)

9. Dosing According to Clinical Indications

10. Safety Profile and Side Effects

• Common Side Effects (may affect up to 1 in 10 people):
  • Dizziness
  • Headache
  • Nausea, constipation
  • Feeling weak or tired
  • Abdominal pain
  • Palpitations
• Uncommon or Rare Side Effects:
  • Low blood pressure (hypotension)
  • Fainting
  • Allergic reactions (rash, itching, swelling)
  • Kidney function changes
• Warnings: Tell your doctor immediately if you experience: unexplained fainting, severe dizziness, irregular heartbeat, or swelling of the lips, face, or tongue.

11. Guidelines for Proper Use

1. Take Ranexa consistently, as prescribed, regardless of how you feel.
2. Do not adjust the dose or stop suddenly without medical advice.
3. Keep regular follow-up appointments to monitor your condition and adjust medication as necessary.
4. Inform your pharmacist about all medicines and over-the-counter products you use.
5. Store Ranexa tablets in a cool, dry place at room temperature (<25°C), and keep out of reach of children.

Pharmacists in Australia can provide a follow-up consultation for patients starting or changing Ranexa, including advice about side effects and drug interactions. Medication review services are available and recommended, especially for those taking multiple heart or blood pressure medicines.

12. Alternative Treatment Options

• Beta-blockers (e.g., metoprolol, atenolol):
  • Pros: First-line, reduce mortality, well-studied
  • Cons: May cause fatigue, cold extremities, unsuitable for asthma/COPD patients
• Calcium channel blockers (e.g., amlodipine, diltiazem):
  • Pros: Good for vasospastic angina; lower blood pressure
  • Cons: Swelling, constipation, flushing
• Nitrates (e.g., glyceryl trinitrate spray, isosorbide mononitrate):
  • Pros: Rapid relief of angina symptoms
  • Cons: Headache, tolerance can develop
• Ivabradine (for specific populations):
  • Pros: Useful if beta-blockers not tolerated
  • Cons: Strict eligibility; may cause slow heart rate or luminous phenomena
• Revascularisation procedures (angioplasty, CABG) in severe cases

Ranexa is often used alongside these medicines when extra symptom relief is needed. Alternative drug funding and reimbursement is available through the PBS in Australia, depending on indication.

13. Legal, Registration, and Reimbursement Status in Australia

• Ranexa (Ranolazine) is registered by the Therapeutic Goods Administration (TGA).
• Classified as a Schedule 4 (Prescription Only) medicine under the Poisons Standard.
• Currently available on private prescription; not routinely reimbursed by the Pharmaceutical Benefits Scheme (PBS) as of 2024 for all indications. Check with your cardiologist or pharmacist for the latest updates and any access schemes or compassionate use programs.
• Can be supplied by Australian community pharmacies with a valid prescription.

14. Latest Research and Clinical Guidance (2022–2025)

The European Society of Cardiology (ESC) 2023 guidelines continue to recommend ranolazine as a second-line option for chronic coronary syndrome, especially in patients poorly tolerant to traditional drugs or with persistent symptoms. Australian cardiology consensus also highlights Ranexa's role in microvascular angina and diabetic heart disease with refractory angina (ESC Guidelines 2023, AHA 2022 Chronic Angina Update).

Ongoing studies investigate its safety in arrhythmia and additional benefits in metabolic syndrome, but these uses remain off-label in Australia. For further reading, visit the TGA and Australian Prescriber websites.

15. Availability and Delivery

*Prices may vary between pharmacies. Delivery estimates apply to metropolitan areas; rural locations may take longer.

16. Frequently Asked Questions (FAQ)

1. What should I do if I miss a dose of Ranexa?
   Take the missed dose as soon as you remember, unless it is almost time for your next dose. Do not double up. Continue with your regular schedule.
2. Can I drink alcohol while taking Ranexa?
   It's best to limit alcohol, as it may increase side effects like dizziness or sleepiness.
3. Is Ranexa safe in pregnancy or breastfeeding?
   Ranexa is not recommended during pregnancy or while breastfeeding unless advised by your doctor, as safety in these groups has not been established.
4. Will Ranexa affect my blood pressure?
   Ranexa usually does not significantly affect blood pressure in most people but can cause mild drops, especially at higher doses or in combination with other heart medicines.
5. Can I stop Ranexa abruptly if my angina improves?
   Do not stop suddenly. Always consult your doctor before making any changes, as sudden discontinuation may worsen your symptoms.

For further information or specific advice, ask your local Australia pharmacist or contact your treating cardiologist.