Theo-24 Cr (Theophylline) — Patient Information (UK)

Theo-24 Cr is a prolonged-release medicine containing theophylline. It is used to help keep airways open and reduce breathing problems in certain lung conditions. This page explains what Theo-24 Cr is, how it works, how to take it safely, and what to watch for.

Important: This information is designed to be patient-friendly and should not replace advice from your healthcare professional. If you have questions about your personal treatment, speak to a pharmacist or prescriber.

1) Basic product information

2) How Theo-24 Cr works (mechanism of action)

Theophylline is a bronchodilator used in long-term control of certain respiratory conditions. It helps by:

• Relaxing airway smooth muscle, making it easier to breathe.
• Increasing cyclic AMP activity within cells, which contributes to airway opening.
• Reducing inflammation and airway reactivity to some extent (benefits vary between individuals).

Because Theo-24 Cr is prolonged-release, it delivers theophylline more steadily than immediate-release formulations, aiming for smoother control throughout the day.

3) Pharmacokinetics (how the body processes it)

Understanding how theophylline behaves in the body helps you take it correctly and avoid side effects.

• Absorption: Theo-24 Cr is designed to release theophylline gradually. Absorption can be affected by stomach conditions and the way the tablet/capsule is taken.
• Onset: With prolonged release, effects develop over hours rather than minutes.
• Duration: The goal is to maintain therapeutic levels over the day (often around 24 hours, depending on the regimen).
• Distribution: Theophylline distributes throughout body tissues; it is important to maintain safe blood levels.
• Metabolism: Theophylline is mainly metabolised in the liver.
• Elimination: The drug is cleared via the kidneys after metabolism. Clearance may be slower in certain conditions.

Key safety concept: Theophylline has a relatively narrow therapeutic range, meaning blood levels that are too low may not control symptoms, and levels that are too high can lead to toxicity. For this reason, clinicians may consider monitoring in some patients.

4) Typical use and where it fits in care

Theo-24 Cr is commonly used for long-term maintenance in respiratory disease, particularly when other options are not suitable or when additional control is required. It may be considered in people with:

• Asthma (especially in adults or selected patients under specialist review)
• COPD (chronic obstructive pulmonary disease) in some treatment pathways

It is not intended to replace your quick-relief inhaler for sudden breathlessness (often a separate “rescue” inhaler). Your healthcare professional can explain your exact plan.

5) When and how to take Theo-24 Cr (timing)

Because Theo-24 Cr is prolonged-release, timing and consistency are important. A typical routine may be once or twice daily depending on your strength and prescribed schedule.

• Take at the same times each day to keep blood levels steady.
• Swallow whole as directed. Do not crush or chew unless your specific product instructions say it is safe to do so.
• Follow your dose schedule carefully. If you miss a dose, do not double up without advice.

Practical tip: Many people find it helps to link dosing with daily routines (e.g., breakfast and evening meal) while still allowing recommended intervals between doses.

6) Food interactions and what to eat/drink

Food can influence theophylline absorption, especially with changes in dietary patterns or stomach conditions. Consider the following:

• Take consistently: Try to take Theo-24 Cr the same way each day (e.g., always with or always without food) unless your clinician advises otherwise.
• High-protein or low-carbohydrate changes: Major changes in diet can potentially affect levels. Keep your routine stable.
• Gastrointestinal upset: Vomiting or severe diarrhoea may change absorption and increase the risk of side effects.
• Grapefruit and certain fruit juices: Some beverages can affect liver enzymes. If unsure, check with your pharmacist.

If you notice symptoms of poor control or side effects after dietary changes (for example, after switching supplements or changing meal timing), speak with your healthcare professional.

7) Alcohol interactions

Alcohol can affect theophylline in several ways, including influencing liver metabolism and potentially worsening side effects.

• Avoid heavy drinking or binge alcohol while taking theophylline.
• Be cautious with moderate alcohol, especially when starting or adjusting your dose.
• Stop and seek advice if you experience palpitations, persistent vomiting, severe headache, or marked dizziness after drinking.

If you have liver disease, heart rhythm problems, or you’re taking interacting medicines, alcohol risk may be higher—ask a pharmacist for personal advice.

8) Other medicines and important drug interactions

Theophylline interacts with a range of medicines because its levels depend on liver enzymes. Some medicines can raise theophylline levels (increasing toxicity risk), while others can lower them (reducing effectiveness).

Always provide your pharmacist with a full list of medicines, including:

• inhalers, tablets, and injections
• antibiotics
• antifungals
• heart rhythm medicines
• antidepressants and other mental health medicines
• anticonvulsants (anti-epileptics)
• stomach medicines
• herbal supplements (especially St John’s wort)

Common examples of interaction types

• Medicines that may increase theophylline levels: certain antibiotics (e.g., macrolides), some antifungals, and other drugs that inhibit liver metabolism.
• Medicines that may decrease theophylline levels: some seizure/anti-epileptic medicines and drugs that induce liver enzymes.
• Caffeine-related overlap: tea, coffee, cola, energy drinks, and some “fat burner” supplements contain caffeine, which can add to jitteriness and heart-related side effects.

Always check before starting or stopping any new medicine while taking Theo-24 Cr. Your pharmacist can verify interactions quickly.

9) Indications (what Theo-24 Cr is used for)

In practice, Theo-24 Cr is used for ongoing control of symptoms associated with obstructive airway diseases.

Depending on local clinical guidance and patient factors, it may be indicated for:

• Asthma: as an additional maintenance option in selected patients.
• COPD: in selected patients where bronchodilation needs are not fully met.

Your clinician will consider your symptoms, current treatments (such as inhaled corticosteroids and long-acting bronchodilators), and suitability for theophylline.

10) Dosing (general information)

Dosing of theophylline must be individual. It depends on age, body weight, smoking status, other medicines, liver function, and how you respond. Because of the narrow safety range, clinicians often start at a lower dose and increase cautiously.

Do not change your dose unless advised by your prescriber.

General dosing principles

• Start low and adjust: Typical practice begins with a conservative dose.
• Smoking matters: Smoking can increase theophylline clearance, potentially reducing effect. Stopping smoking may increase levels.
• Age and liver function matter: Older adults and people with liver impairment may require lower dosing.
• Interactions matter: Co-administered medicines may require dose changes.

Monitoring

Where appropriate, your healthcare team may measure theophylline levels through a blood test, particularly after dose changes or when interactions occur. Monitoring helps keep levels in a safer range.

11) Safety profile and side effects

Theophylline can cause side effects, especially if levels become too high. Many side effects relate to its effect on the heart and nervous system.

Common side effects

• Nausea or stomach discomfort
• Headache
• Restlessness or difficulty sleeping
• Heartburn
• Feeling shaky or jittery

Signs of possible toxicity (seek urgent medical advice)

Stop taking the next dose and seek prompt medical advice if you experience symptoms suggestive of high theophylline levels, such as:

• Persistent vomiting
• Severe or worsening tremor
• Marked palpitations or irregular heartbeat
• Seizures (emergency)
• Severe dizziness or confusion

If you have a known history of heart rhythm problems, seizures, or significant liver disease, extra caution is needed—discuss this with a clinician.

Who should be extra cautious?

• people with liver impairment
• people with heart rhythm disorders
• people with stomach ulcers or significant reflux (symptoms may worsen)
• people who are elderly
• people who have recently changed smoking habits
• people taking medicines with known interaction potential

12) Practical use tips (how to get the most from your treatment)

• Keep a symptom diary: Note breathlessness, night waking, inhaler use, and side effects. This can help your clinician adjust treatment.
• Avoid doubling: If you miss a dose, take the next one when due unless your pharmacist tells you otherwise. Do not double doses.
• Be careful with caffeine: Tea, coffee, energy drinks, and some pain relief products can increase caffeine effects. Keep your caffeine intake consistent.
• Don’t stop suddenly: Unless advised, stopping theophylline may worsen control of symptoms. Discuss changes with your healthcare professional.
• Check your medicines list: Each time you attend a pharmacy or add a new product (including herbal supplements), ask about interactions.
• Store correctly: Keep tablets/capsules in the original packaging and follow storage instructions on the label.

13) Alternative options (if Theo-24 Cr isn’t suitable)

Whether an alternative is appropriate depends on your diagnosis (asthma vs COPD), severity, and current inhaler regimen. Options may include:

For asthma

• Inhaled corticosteroids (ICS) (often combined with long-acting bronchodilators)
• Long-acting beta₂-agonists (LABAs) and/or long-acting muscarinic antagonists (LAMAs) depending on severity
• Leukotriene receptor antagonists (for selected patients)
• Other bronchodilator strategies based on specialist assessment

For COPD

• LAMAs and LABAs
• ICS-containing inhalers in specific groups
• Roflumilast in selected COPD patients (where appropriate)
• Supportive measures such as pulmonary rehabilitation, smoking cessation, and vaccinations

Some patients may be offered other theophylline products or different release formulations. Your pharmacist can explain differences in timing and dosing.

14) UK market and legal context (high-level)

In the United Kingdom, theophylline medicines are used in respiratory care and are subject to UK medicines regulations, including requirements around product information, supply, and pharmacy practice.

• Availability: Theo-24 Cr is supplied through licensed channels and may be subject to stock changes depending on manufacturer supply.
• Safety information: UK product labelling and patient information are designed to highlight key interaction and safety considerations.
• Professional oversight: Pharmacists and clinicians help ensure it is safe with your current medicines and health status.

Guidance and prescribing approaches can evolve. Your healthcare professional may prefer other options in some cases due to safety monitoring considerations and evolving asthma/COPD treatment standards.

15) Recent guidance and evolving practice (overview)

Respiratory medicine guidance in the UK (including asthma and COPD management) generally prioritises inhaled therapies because they deliver treatment directly to the lungs with fewer systemic side effects than some oral medicines.

In this context, theophylline is often used:

• when symptoms are not adequately controlled with first-line inhalers
• when other add-on options are unsuitable or ineffective
• under closer supervision due to interaction potential and safety monitoring needs

Your clinician may consider whether theophylline remains the best option for you based on your symptom control, exacerbation history, and tolerability.

16) Delivery and availability in the UK

Online pharmacies in the UK typically deliver Theo-24 Cr to eligible addresses within the United Kingdom. Availability can vary by strength and whether the product is in stock with the supplier.

• Stock checks: Orders are usually processed after availability is confirmed.
• Delivery options: Standard and express delivery may be offered depending on the pharmacy.
• Packaging: Medicines are supplied in appropriate child-resistant packaging where required.
• Tracking: Many services provide delivery updates.

Note: Delivery timelines can change during holidays, adverse weather, or supply disruptions. If you need the medicine urgently, contact customer support for the latest estimate.

17) Theo-24 Cr FAQ

How long does it take to work?

Because Theo-24 Cr is prolonged-release, it typically takes longer than a fast-acting reliever inhaler. Some improvement may be felt over hours, with steadier benefit over the day. If you don’t feel any benefit after your clinician expects a trial period, speak to them rather than increasing your dose yourself.

Can I use my inhaler as usual?

In many asthma and COPD plans, you continue using your prescribed reliever/inhalers alongside maintenance medicines. Theo-24 Cr is not a substitute for a quick-relief inhaler during sudden breathlessness. Follow your personalised plan.

What should I do if I miss a dose?

Take the next dose at the scheduled time. Do not take extra tablets to make up for the missed dose unless a pharmacist advises it. If you’re unsure, contact a pharmacist for guidance.

Can I take Theo-24 Cr with food?

Many people take it consistently with or without food based on their routine and clinical advice. The most important factor is to keep the method consistent day to day and follow the instructions on your label.

Should I avoid coffee or tea?

Because theophylline can cause similar stimulant-type side effects to caffeine, it’s best to avoid large changes in your caffeine intake. Keep your caffeine stable and limit energy drinks. If you experience jitteriness, palpitations, or insomnia, reduce caffeine and speak to a healthcare professional.

What interactions should I be most concerned about?

Speak to a pharmacist before starting new medicines or supplements. Particular attention is needed for antibiotics, antifungal medicines, medicines affecting liver enzymes, and herbal products such as St John’s wort.

Can I drink alcohol while taking Theo-24 Cr?

Small amounts may be tolerated by some people, but heavy or binge drinking increases the risk of side effects and may alter liver metabolism. Use caution and seek advice if you notice adverse effects.

Is it safe for everyone?

No. Theo-24 Cr may not be suitable if you have certain heart rhythm conditions, seizure disorders, significant liver disease, or if you take interacting medicines. Your pharmacist can assess your situation by reviewing your current medicines and health conditions.

What are warning signs that I should get help urgently?

Seek urgent medical help if you experience severe vomiting, irregular or very fast heartbeat, fainting, severe tremor, confusion, or seizures. These may indicate high theophylline levels.

Can smoking affect my dose?

Yes. Smoking can change how quickly theophylline is cleared from the body. If you smoke, stop, or change your smoking amount, you should inform your healthcare professional.

Summary

Theo-24 Cr (theophylline) is a prolonged-release oral medicine used to support bronchodilation and help manage certain asthma or COPD symptoms. It works over time and requires careful, consistent use because theophylline levels can be affected by drug interactions, diet changes, smoking status, and other health factors.

If you’re unsure how to take Theo-24 Cr, or if you start new medicines or supplements, ask a pharmacist for advice to keep your treatment safe and effective.