Theo-24 Cr (Theophylline): Patient-Friendly Medicine Guide for Australia
Basic Product Information
| Active Ingredient (INN) | Theophylline |
|---|---|
| Australia Brand Names | Theo-24 Cr, Nuelin SR, Theophylline Chiesi |
| ATC Code | R03DA04 |
| Available Forms/Strengths | Modified-release capsules and tablets: 100 mg, 200 mg, 300 mg, 400 mg |
| Manufacturers | Teva Pharma Australia, Mayne Pharma, Chiesi Australia |
| Prescription Status | Schedule 4 (Prescription Only Medicine) in Australia |
Mechanism of Action
- Simple Explanation: Theophylline helps to relax the muscles in your airways and lungs, making it easier to breathe. It can reduce wheeze, coughing, or shortness of breath in conditions such as asthma or chronic obstructive pulmonary disease (COPD).
- For Healthcare Professionals: Theophylline is a methylxanthine derivative with bronchodilator activity, acting primarily through non-selective inhibition of phosphodiesterase (PDE) enzymes, thus increasing intracellular cAMP. It also antagonises adenosine receptors, resulting in bronchial smooth muscle relaxation and mild anti-inflammatory effects.
Pharmacokinetics
- Absorption: Theophylline is well-absorbed orally, especially from slow-release (modified release) formulations like Theo-24 Cr, providing sustained blood levels over 24 hours.
- Metabolism: Metabolised primarily in the liver (CYP1A2 enzyme). Metabolism can be affected by age, medical conditions, and certain foods or medications.
- Elimination: Mainly excreted in the urine as metabolites; a small proportion is excreted unchanged.
- Duration of Action: Modified-release forms provide therapeutic levels for 12–24 hours, allowing once or twice-daily dosing.
Use in Everyday Life and Best Practices
- Indications: Theophylline is prescribed mostly for asthma, COPD, and sometimes for certain cases of apnoea of prematurity (usually in hospital settings).
- How to Use: Swallow tablets/capsules whole with a glass of water. Do not crush or chew, as this may affect how the medicine works.
- Typical Doses in Australia: Usually between 200–400 mg once or twice per day, but your doctor determines the correct dose based on your condition, age, smoking status, and any other medical issues.
- Monitoring: Regular blood tests may be advised to check levels (therapeutic drug monitoring) and reduce risk of side effects, especially when starting, changing dose, or alongside other medicines.
- Missed Dose: If you miss your dose, take it as soon as you remember—unless it’s nearly time for the next dose. Never double up to make up for a missed dose.
Dosing in the Morning vs Evening
- Morning Dosing: May reduce the risk of night-time side effects like sleeplessness or jitteriness, especially for those sensitive to caffeine-like effects.
- Evening Dosing: Can help control night-time asthma symptoms; often suitable with slow-release forms. Ensure dosing is consistently at the same times daily.
- Tip: Stick to your schedule. If you’re having trouble with sleep or symptoms, speak to your GP or pharmacist for advice.
Taking With Food or on an Empty Stomach
- Theo-24 Cr can be taken with or without food. However, to maintain consistent absorption, it’s best to take each dose the same way—either always with food or always on an empty stomach.
- Heavy, high-fat English meals can delay or increase absorption, sometimes leading to higher peak drug levels.
- If you experience stomach upset, taking the medicine with a light meal or snack may help.
- Beverages: Limit or avoid large amounts of caffeinated drinks (tea, coffee, cola), as these can increase side effects.
Interaction Warnings
| Substance | Effect | Advice |
|---|---|---|
| Cigarette Smoking | Increases metabolism of theophylline, reducing its effectiveness | Tell your doctor if you smoke or quit smoking |
| Alcohol | May increase side effects and levels | Limit alcohol; discuss with your doctor if you drink regularly |
| Antibiotics (e.g. ciprofloxacin, erythromycin) | May increase theophylline levels | Inform your doctor/pharmacist of all medicines |
| Antiepileptics (phenytoin, carbamazepine) | May decrease theophylline levels | Dosage adjustments may be needed |
| Other asthma/COPD medicines (beta-agonists, steroids) | May increase risk of side effects | Ensure your GP is aware of all your medicines |
| Common foods (chocolate, coffee, tea) | Contain caffeine; may worsen side effects | Moderate intake advised |
| Flu vaccines/infections | May temporarily reduce metabolism, raising levels | Extra monitoring may be needed if ill |
Indications
| Official Indications | Off-Label Uses |
|---|---|
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|
Dosing According to Clinical Indication
| Population | Clinical Use | Usual Dose (mg/day) | Notes |
|---|---|---|---|
| Adults | Asthma, COPD | 200–400 mg once or twice daily | Adjust based on clinical response and blood levels |
| Children (6–12 years) | Asthma | 12–18 mg/kg per day in 2 divided doses | Specialist paediatric monitoring required |
| Elderly (>65 years) | Asthma, COPD | Start lower (100–200 mg once or twice daily) | Sensitivity and slower metabolism; regular monitoring needed |
| Premature Infants | Apnoea of prematurity | Specialist use only | Hospital administration and monitoring |
Safety Profile & Side Effects
| Frequency | Side Effect | What To Do |
|---|---|---|
| Common | Headache, nausea, vomiting, stomach upset, diarrhoea, restlessness, increased urination | Usually mild and temporary. See a doctor if persistent or uncomfortable |
| Occasional | Palpitations, dizziness, difficulty sleeping (insomnia), muscle cramps | Tell your doctor or pharmacist |
| Rare but Serious | Seizures, irregular/fast heartbeat, severe vomiting, rash, confusion | Stop medicine and seek urgent medical attention |
| Monitoring | Blood level checks, especially early in treatment or dose changes | Essential to avoid toxicity |
Guidelines for Proper Use (Australia Conditions)
- Always follow your GP or specialist's instructions regarding your dose and how to take the medicine.
- Have your blood levels checked as directed, especially when starting treatment or changing your dose.
- Inform your healthcare team of all medications and supplements, including over-the-counter items.
- Report any unusual symptoms or side effects, particularly those listed as rare or serious above.
- Store the medicine in a cool, dry place, below 25°C, out of reach of children.
- If you’re travelling, carry your medication and prescription with you—helpful for airline security or emergencies.
- Never share your prescription with others, even if they have similar symptoms.
Alternative Treatment Options in Australia
- Inhaled Bronchodilators: e.g. salbutamol (Ventolin), formoterol, long-acting beta-agonists (LABAs)
- Inhaled Corticosteroids: e.g. budesonide, fluticasone (usually standard care for asthma/COPD in Australia; Medicare rebates apply)
- Leukotriene Receptor Antagonists: e.g. montelukast
- Anti-cholinergic inhalers: e.g. ipratropium, tiotropium
- Theophylline is generally used as add-on therapy when other treatments are insufficient or unsuitable.
- Pros: Oral route, useful for some difficult-to-control cases
- Cons: Narrow therapeutic index, many drug/food interactions, need for monitoring
Legal, Registration, and Reimbursement Status (Australia)
- Theo-24 Cr is registered with the Therapeutic Goods Administration (TGA).
- Available by prescription only (Schedule 4, S4).
- Rebated under the Pharmaceutical Benefits Scheme (PBS) for approved indications.
- Not suitable for over-the-counter use.
Latest Research & Clinical Guidance (2022–2025)
- Theophylline is recommended as an add-on therapy in select cases of asthma and COPD when inhaled treatments are insufficient.
- Studies emphasise careful monitoring due to its narrow therapeutic window and potential for toxicity.
- Recent English Thoracic Society guidelines (2023) advise using theophylline only if standard therapies do not adequately control symptoms.
- Cochrane reviews (2022–2024) and Lung Foundation Australia advice highlight a declining but still valid role for theophylline, especially as an add-on in difficult cases.
- New combinations and delivery forms are under investigation, but no breakthrough changes have altered the basic place of theophylline since 2023.
Availability & Delivery to Major Australia Cities
| Pack Size | Indicative Price under PBS* | Example Delivery Times |
|---|---|---|
| 60 tablets (200 mg) | $6.50 | Sydney: Next business day Melbourne: Next business day Brisbane: 1–2 business days Adelaide: 2 business days Perth: 2–4 business days |
| 100 capsules (400 mg) | $14.20 | Sydney: Next business day Melbourne: 1 business day Brisbane: 2 business days Adelaide: 2 business days Perth: 2–5 business days |
*Prices may vary; for PBS-eligible patients. Non-PBS private prices may be higher.
Frequently Asked Questions (FAQ)
- Q: What should I do if I miss a dose?
A: Take it as soon as you remember, unless it’s nearly time for your next dose. Do not take a double dose. If unsure, call your pharmacy or GP. - Q: Can I drink alcohol or coffee while taking Theo-24 Cr?
A: Moderate intake is generally safe, but both alcohol and caffeinated drinks can increase side effects. Try to keep consumption consistent and report any new symptoms to your doctor. - Q: How often do I need blood tests while on this medication?
A: Typically when starting treatment, at dose changes, or if you begin new medications. Long-term, your specialist may recommend periodic monitoring. Follow your doctor’s advice closely. - Q: Why do I need to swallow the tablets whole?
A: Breaking, crushing, or chewing Theo-24 Cr can cause the medicine to be released too quickly, increasing the risk of side effects or toxicity. - Q: Can Theo-24 Cr be used in children?
A: Yes, but the dose must be carefully calculated and monitored by a paediatrician. It is not commonly used as first-line treatment in children and only under specialist supervision.
Always seek professional medical advice before starting or adjusting any medication. If you have questions or need further guidance, talk to your pharmacist or GP.
