Theo-24 Sr (Theophylline) – Patient Guide (UK)

Theo-24 Sr is a brand of theophylline in a sustained-release (SR) formulation. It is used to help keep the airways open and reduce symptoms of certain long-term lung conditions. This page explains what Theo-24 Sr is, how it works, how it is taken, key safety points, and what to expect when using the medicine in the UK.

Please use this information alongside advice from your healthcare professional and the patient information leaflet supplied with your medicine.

Quick overview

• Active ingredient: Theophylline (sustained release)
• Form: SR (slow/extended release) capsules or tablets (brand presentation may vary)
• Common use: Long-term control for symptoms in some people with asthma or chronic lung disease (as advised)
• Key feature: Designed to release the medicine gradually over the day
• Important note: Theophylline levels must be managed carefully due to potential side effects if levels become too high

Basic product information

How Theo-24 Sr works (mechanism of action)

Theophylline belongs to the group of medicines called xanthines. In the body it:

• Relaxes smooth muscle in the airways (bronchodilation), helping improve breathing.
• Reduces “signal” pathways involved in bronchoconstriction and airway reactivity.
• May have anti-inflammatory effects and can influence how the body responds within the airways.

The overall result is improved airflow and fewer symptoms for the condition it is used to treat.

Pharmacokinetics (how the body handles the medicine)

“Pharmacokinetics” describes what happens after you take Theo-24 Sr: how quickly it’s absorbed, how it spreads in the body, how it’s broken down, and how it leaves.

Absorption and sustained release

With SR theophylline, the medicine is released gradually. This aims to provide a steadier blood concentration over the day compared with immediate-release forms.

Distribution

Theophylline distributes into body tissues, including the lungs, to help exert its effect where needed.

Metabolism

Theophylline is mainly metabolised by the liver. Factors that change liver enzyme activity (for example some medications, smoking status, and certain illnesses) can change theophylline levels.

Elimination

Theophylline is removed from the body primarily through metabolism and excretion. The time it takes for levels to fall can vary between individuals.

Why blood level matters

Theophylline has a narrow therapeutic range, meaning the difference between effective and potentially harmful levels can be small. For this reason, your prescriber may advise blood tests (theophylline “levels”)—especially if you are older, have liver problems, are taking interacting medicines, or if symptoms change.

Typical uses in the UK

Theo-24 Sr may be used as a long-term treatment for airway disease to help control symptoms such as wheeze, shortness of breath, chest tightness, and breathing difficulties.

In the UK, the exact choice of add-on medicines depends on your diagnosis and severity. Theophylline may be considered in some situations when other options are not suitable or are not sufficiently controlling symptoms.

Common indications (as advised by your healthcare team)

• Asthma (long-term control in selected cases)
• COPD (chronic obstructive pulmonary disease) in selected patients

Theo-24 Sr is generally not intended for quick relief of sudden breathlessness or acute asthma attacks. For sudden symptoms, many people use a reliever inhaler as directed.

When to take Theo-24 Sr (timing and consistency)

Because Theo-24 Sr is sustained release, timing and routine are important for stable levels. Take it exactly as instructed on your label.

General timing principles

• Take at the same times each day to maintain steady levels.
• Do not double up if you miss a dose unless your healthcare professional instructs you to.
• Swallow whole (do not crush or chew) unless the product guidance specifically allows otherwise.

Missed dose (general advice)

If you miss a dose, follow the instructions in the leaflet or on your label. In general, don’t take extra to “catch up” unless advised, because sudden changes in theophylline level can increase side effects.

Food interactions (and how to manage them)

Food can affect the absorption and stomach tolerance of medicines. With theophylline, effects may vary by formulation and individual factors.

Practical food tips

• Take consistently with the same approach (for example, with meals or always on an empty stomach), unless told otherwise.
• If it upsets your stomach, taking it with food may help.
• Avoid sudden major dietary changes that may affect overall metabolism without medical advice.

When to seek advice

Contact your healthcare professional if you notice persistent nausea, vomiting, or stomach pain after starting Theo-24 Sr, particularly if symptoms suggest drug accumulation.

Alcohol and medicine interactions

Alcohol

Alcohol can interact with theophylline indirectly by affecting the liver and your overall tolerance of the medicine. It may also increase the risk of side effects such as nausea, dizziness, and headaches.

• Keep alcohol intake moderate and discuss regular drinking with your healthcare professional.
• Avoid binge drinking, especially when you first start treatment or when your dose changes.

Medication interactions (very important)

Many medicines can affect theophylline levels by changing liver enzymes. Some can increase levels and raise the risk of toxicity; others may reduce levels and make Theo-24 Sr less effective.

Always tell your healthcare professional about all medicines you take, including:

• inhalers and tablets for asthma/COPD
• antibiotics
• antifungals
• heart medicines
• stomach medicines (for example ulcer treatments)
• anticonvulsants
• supplements and herbal products

Examples of medicines that may interact

Theophylline interactions can be complex. Some commonly relevant categories include:

• Antibiotics (some types can raise theophylline levels)
• Antifungal medicines (may increase levels)
• Medicines for heart rhythm (can interact)
• Stomach acid–reducing medicines (may affect metabolism)
• Medicines that affect liver enzyme activity (some can increase or decrease theophylline)
• Herbal products (e.g., some “natural” remedies) that may alter metabolism

If you are starting, stopping, or changing any medicine, it’s important to ask whether Theo-24 Sr dosing or monitoring should be adjusted.

Safety profile and when to be careful

Theophylline can cause side effects, and because of the narrow therapeutic window, toxicity is a key risk if blood levels become too high. Risk may increase with dose changes, certain interacting medicines, older age, fever, liver disease, heart failure, or changes in smoking habits.

Common side effects

• Nausea, vomiting
• Headache
• Tremor or feeling “jittery”
• Restlessness or trouble sleeping
• Stomach upset, heartburn
• Palpitations (feeling your heartbeat)

Serious symptoms (seek urgent medical help)

Contact urgent medical services if you experience symptoms that could indicate high theophylline levels, such as:

• Severe vomiting or persistent severe nausea
• Fainting or severe dizziness
• Seizures
• Severe palpitations, very fast heart rate, or chest pain
• Confusion or marked agitation

If you think you may have taken too much, seek help immediately.

Who should be extra cautious

• Older adults (sensitivity can be higher)
• People with liver impairment
• People with heart failure
• People taking multiple medicines that may interact
• People with fever or serious illness (can change levels)

Practical use tips (to get the best results)

• Keep a consistent routine: choose times that you can maintain daily.
• Don’t adjust the dose on your own. If symptoms change, contact your healthcare professional.
• Track symptoms: note changes in breathlessness, nighttime symptoms, and reliever use.
• Be mindful of smoking changes. Starting or stopping smoking can significantly affect theophylline metabolism. Tell your clinician if you change your smoking status.
• Ask about monitoring. If blood level monitoring is advised, attend for tests as scheduled.
• Check for interactions before starting new medicines (including over-the-counter products).

Dosing information (general guidance)

Dose depends on factors such as age, body weight, smoking status, liver function, and current interacting medicines. Therefore, the only safe dosing guidance is the one given on your medicine label and by your healthcare professional.

Typical pattern (high-level)

• Often taken once or twice daily with SR formulations.
• Dose is commonly adjusted gradually to balance symptom control with side effect risk.

Important dosing safety points

• Use the SR product as directed. Do not switch between immediate-release and SR forms without medical advice.
• Do not crush or chew unless specifically instructed.
• If you develop symptoms suggestive of high levels (for example significant nausea, tremor, palpitations), seek advice promptly.

Blood tests (theophylline levels)

Your clinician may request a blood test to check theophylline level, especially when starting therapy, after dose changes, or if interacting medicines are added. They will also advise the correct timing of the blood sample relative to your dose.

Alternative options for airway conditions (UK)

Depending on your condition and severity, other medicines are often used alongside or instead of theophylline. Your healthcare professional will tailor treatment to you.

Common alternatives (examples)

• Inhaled corticosteroids (ICS) for asthma and some COPD cases
• Long-acting bronchodilators such as LABA and LAMA
• Short-acting reliever inhalers for acute symptom relief
• Leukotriene receptor antagonists for some asthma patients
• Other add-on oral medicines considered case-by-case

If you are considering switching from Theo-24 Sr, do not stop suddenly without medical guidance. The aim is to maintain control of symptoms safely.

Recent guidance and how treatment is approached in the UK

In the UK, asthma and COPD management generally follows national and international guidance focused on:

• Using inhaled therapies as the cornerstone for long-term control
• Employing stepwise treatment based on symptom severity and risk
• Assessing inhaler technique, adherence, triggers, and comorbidities
• Minimising medicines with higher risk of systemic side effects where alternatives are available

Because theophylline requires careful level monitoring and has interaction potential, it may be used selectively in line with clinical judgement and patient-specific factors.

Market and legal context in the United Kingdom

Medicines containing theophylline are regulated in the UK. Availability and classification depend on the exact product presentation and strength. Online supply should only be through appropriate channels that comply with UK pharmacy and medicines regulations.

When ordering online, you should expect:

• Brand and strength checks
• Guidance to confirm you understand dosing instructions
• Advice to check interactions and suitability with your healthcare professional where needed

Always ensure the medicine you receive matches what you intended to order (brand, strength, and formulation).

Delivery and availability (UK online pharmacy)

Availability of Theo-24 Sr can vary by strength and supplier due to demand and supply logistics. Most online pharmacies offer:

• Standard and expedited delivery options (where available)
• Tracking details once dispatched
• Packaging designed to protect tablets/capsules and maintain product integrity

Delivery times depend on stock levels and location. If you need your medicine urgently, check the estimated dispatch and delivery date at checkout.

FAQ

1) What is Theo-24 Sr used for?

Theo-24 Sr (theophylline sustained release) is used for long-term control of certain airway conditions such as asthma or COPD in selected patients, as advised by healthcare professionals.

2) Is Theo-24 Sr a reliever inhaler?

No. Theo-24 Sr is a long-term medicine designed to maintain control. It is not typically intended for immediate relief during sudden symptoms. Use your reliever medicine as directed for acute episodes.

3) How long does it take to work?

Some symptom improvement may be noticed over days, but consistent benefit usually depends on reaching steady levels and ongoing treatment. Your clinician can advise what to expect in your case.

4) Can I take it with food?

You may take it with food if it upsets your stomach, but try to keep your routine consistent. If your leaflet or label specifies particular instructions, follow those.

5) What should I do if I miss a dose?

Follow the leaflet/label instructions. Avoid taking extra doses to compensate unless your healthcare professional tells you to, because changes can affect your theophylline level.

6) Why do doctors monitor theophylline levels?

Theophylline can be effective at certain concentrations but may cause serious side effects if levels rise too high. Blood tests help ensure the medicine stays within a safer range, particularly when starting, changing dose, or using interacting medicines.

7) Which medicines interact with theophylline?

Many medicines can affect theophylline levels. Always tell your healthcare professional about all medicines and herbal products you use. If you start a new medication, ask whether it may interact with theophylline.

8) Can I drink alcohol while taking Theo-24 Sr?

Moderate alcohol may be possible for some people, but alcohol can increase side effects and may affect the liver. It’s best to discuss your usual alcohol intake with your healthcare professional.

9) What are signs that my dose may be too high?

Early signs can include nausea/vomiting, tremor, agitation, headache, or palpitations. Severe symptoms (such as seizures, fainting, or severe persistent vomiting) require urgent medical attention.

10) Can I smoke while using Theo-24 Sr?

Smoking status can affect theophylline metabolism. If you smoke, or if you plan to stop or start smoking, let your healthcare professional know because your dose or monitoring may need adjustment.

11) Are there alternatives to Theo-24 Sr?

Yes. Depending on your diagnosis and severity, inhaled therapies and other add-on options may be considered. Discuss alternatives with your healthcare professional.

Important patient reminder

This guide is designed to help you understand Theo-24 Sr and use it more safely. It does not replace the patient information leaflet or advice from your healthcare professional. If you have any concerns about interactions, side effects, or whether Theo-24 Sr is suitable for you, seek medical or pharmacy advice promptly.