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

Theo-24 Cr is a long-acting form of theophylline, a medicine used to help keep airways open and reduce symptoms in certain lung conditions. This page is designed to help you understand what the medicine does, how it works in the body, how to take it safely, and what to consider in everyday life in the United Kingdom.

Always follow the instructions provided by your healthcare professional and the information on your medicine label.

Basic product information

• Medicine name: Theo-24 Cr
• Active ingredient: Theophylline
• Formulation: Controlled/extended release (“Cr” = controlled release)
• What it’s for: Long-term symptom control in selected breathing problems (typically asthma and/or chronic obstructive pulmonary disease)
• How it works: Releases theophylline slowly over time

Important: Because theophylline has a narrow safety range, blood levels may be monitored in some people. This helps reduce the risk of side effects.

What Theo-24 Cr is used for (indications)

Theophylline is used as an add-on controller medicine to improve breathing and reduce symptoms in people with:

• Asthma that is not adequately controlled with standard inhaled medicines
• COPD (chronic obstructive pulmonary disease), to help relieve symptoms in selected patients

In most UK care pathways, inhaled treatments (such as inhaled corticosteroids, long-acting bronchodilators, and short-acting relievers) remain central. Theophylline is generally considered when symptoms persist or when it is clinically appropriate for the individual.

How it works (mechanism of action)

Theophylline helps by relaxing airway smooth muscle and improving airflow. It acts through several mechanisms, including:

• Bronchodilation: helps open the airways by relaxing smooth muscle.
• Anti-inflammatory effects: may reduce certain inflammatory processes in the lungs.
• Improves responsiveness: can help the body respond better to normal airway function.
• Reduces fatigue of breathing muscles: theophylline may have effects on respiratory muscle activity.

Because Theo-24 Cr is long-acting, it is intended to provide sustained symptom relief over the day and night.

Pharmacokinetics (how the body handles it)

Understanding pharmacokinetics can help explain why timing, consistent dosing, and avoiding interactions are important.

Typical use and expected benefits

Theo-24 Cr is used for maintenance—it helps prevent symptoms from building up. It is not typically intended as a “rescue” medicine for sudden breathlessness.

With regular use, people may notice:

• Reduced wheeze and breathlessness
• Better ability to tolerate everyday activities
• Fewer flare-ups when combined with inhaled controller medicines

Note: If your breathing suddenly worsens or you need your reliever inhaler more than usual, seek medical advice urgently according to your asthma/COPD action plan.

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

Correct timing is important to keep the blood levels steady and reduce the risk of side effects.

• Take at the same times each day, as instructed.
• Do not change the schedule without advice.
• Swallow whole, unless your pharmacist or doctor says otherwise.
• Do not crush or chew controlled/extended release tablets/capsules unless specifically directed—this can cause faster release and higher levels.

Missed dose: If you miss a dose, take it when you remember unless it is close to the next dose. Do not take a double dose to make up for a missed tablet. If unsure, check with your pharmacist.

Dosing (general guidance)

Dosing varies by age, lung condition, smoking status, and other medicines. Your prescriber may also base dose on theophylline blood level results.

Typical approach:

• Doctors often start with a lower dose and adjust gradually.
• Some people may require dose adjustments due to liver function, drug interactions, or changes in smoking.
• In some cases, theophylline blood tests are used to guide dosing.

Follow your label: Your exact strength and schedule (for example, once or twice daily) should be taken from your medicine packaging or the advice you were given.

Do not exceed the prescribed dose. Higher doses increase the risk of serious side effects.

Food interactions

Most people can take Theo-24 Cr with food, but individual advice may vary. In general:

• Avoid sudden changes in meal timing if possible—consistent routines help maintain predictable absorption.
• Some foods or drinks may affect absorption for certain medicines; if your prescriber or pharmacist advised a specific pattern, follow it.

Practical tip: Taking the medicine with a consistent routine (e.g., after breakfast and/or after dinner) can reduce day-to-day variability.

Alcohol and medicine interactions

Theophylline interacts with a wide range of medicines, and these interactions may affect theophylline levels—raising the risk of side effects or reducing effectiveness.

Alcohol

Alcohol may affect your breathing, sleep, and overall health. It may also influence drug processing in the liver in some people. In general:

• Limit alcohol and avoid heavy drinking.
• If you notice increased nausea, dizziness, palpitations, or worsening tremor after alcohol, seek advice promptly.

Common medicine interactions (important)

Tell your healthcare professional about all medicines you take, including over-the-counter products and herbal remedies. Several types of medicines can meaningfully affect theophylline:

• Antibiotics (some macrolides and fluoroquinolones can raise theophylline levels)
• Antifungals (may increase theophylline levels)
• Smoking-related factors: smoking can increase the metabolism of theophylline, potentially reducing levels
• Severe stomach acid suppressors or other medicines that affect liver enzymes (effects vary)
• Other bronchodilators or respiratory medicines may add to effects on heart rhythm or side effects
• Seizure medicines (some can change theophylline levels)
• Cardiac medicines: may interact indirectly by affecting heart rate or rhythm

Special care: If you start, stop, or change dose of any medicine, ask whether it affects theophylline. Even short courses of antibiotics can matter.

Safety profile and side effects

Like other medicines, Theo-24 Cr can cause side effects. Because theophylline levels must be kept within a safer range, side effects are more likely at higher blood levels.

Seek urgent medical help if you experience

• Severe palpitations, fast or irregular heartbeat
• Chest pain
• Fits (seizures)
• Severe confusion or extreme agitation
• Vomiting that won’t stop or signs of dehydration

Common side effects

• Nausea
• Stomach upset or discomfort
• Headache
• Tremor (shakiness)
• Difficulty sleeping (insomnia)

Less common but important

• Feeling restless or anxious
• Heart rhythm changes (usually related to higher levels)
• Reflux or indigestion

Monitoring: Your clinician may check blood levels, especially if you are elderly, have liver problems, change smoking habits, or take medicines known to interact with theophylline.

Practical use tips (to get the best and safest results)

• Be consistent: take doses at the same times each day.
• Swallow whole: do not crush or chew extended-release forms.
• Check labels for changes: always confirm you have the correct product and strength (controlled release tablets/capsules should not be substituted without advice).
• Keep a medication list: include inhalers, antibiotics, pain relief, and herbal products.
• Smoking status matters: tell your clinician if you start smoking, stop smoking, or change the amount you smoke.
• Watch your caffeine intake: beverages like coffee, tea, energy drinks, and some colas contain caffeine, which may add stimulation and increase side effects in some people.
• Hydration and illness: if you become unwell (fever, vomiting, diarrhoea), ask whether your medicine should be continued as normal; dehydration and illness can affect tolerance.

Alternative options

There are several alternatives depending on your diagnosis (asthma or COPD), symptom severity, and response to inhaled therapy.

For asthma

• Inhaled corticosteroids (ICS) (often the foundation of control)
• Long-acting beta-2 agonists (LABA) often combined with ICS
• Leukotriene receptor antagonists (e.g., montelukast)
• Biologics for selected severe asthma phenotypes

For COPD

• Long-acting bronchodilators (LAMA, LABA, or combinations)
• Inhaled corticosteroids in selected people
• Roflumilast or other specialist medicines where appropriate

Why alternatives may be considered: Theophylline has a higher risk of side effects than many inhaled therapies, and interactions are common. However, it may still be suitable for some individuals.

Market and legal context in the United Kingdom

In the UK, theophylline-containing products are regulated medicines. Availability can depend on manufacturer supply, prescribing practices, and whether the product is supplied in a particular strength or release form.

For long-term respiratory conditions, UK clinical practice generally prioritises guideline-based inhaled therapies. Theophylline may be used when clinically indicated or when symptoms persist despite standard care.

Regulatory and safety context: Medicines that can cause serious harm when levels are too high are typically associated with careful dosing guidance and monitoring requirements in clinical use.

Recent guidance and clinical considerations (UK context)

UK asthma and COPD care increasingly emphasises:

• Correct inhaler technique and adherence to controller therapy
• Personalised step-up or step-down based on symptom control and exacerbation risk
• Smoking cessation and management of contributing factors
• For add-on medicines: use of options that best balance benefit with safety and interaction risk

Because theophylline interacts with many medicines and its effective dose can be close to the dose that causes side effects, clinicians may consider monitoring and interaction checks more strongly than for many inhaled alternatives.

Delivery and availability (UK online pharmacy)

Availability of Theo-24 Cr may vary by supplier and strength. If you order online, you typically receive:

• Discreet packaging
• Delivery updates depending on the courier service
• Expiry and batch information on the product carton/leaflet

Delivery: Delivery times can depend on stock levels and the dispatch process. During periods of high demand or supply shortages, dispatch may be delayed. You can usually view delivery estimates during checkout.

Availability: Extended-release formulations may not be stocked continuously. If an item is temporarily unavailable, the pharmacy may offer an alternative strength/formulation or contact you (if required) with options.

Safety checklist before you start (or when reviewing your dose)

• Do you take any medicines for infection (especially certain antibiotics)?
• Are you taking any medicines for heart rhythm, seizures, stomach acid, or allergies?
• Have you recently stopped or started smoking?
• Do you drink lots of caffeine or use energy drinks?
• Do you have liver disease, heart problems, or a history of seizures?
• Do you feel your dose may have been changed recently?

If you are unsure about a medicine interaction, ask your pharmacist for advice.

FAQ – Frequently asked questions

1) Is Theo-24 Cr the same as instant-release theophylline?

No. Theo-24 Cr is an extended/controlled-release product designed to release theophylline slowly. You should not substitute another formulation without professional guidance, and you should not crush or chew extended-release tablets.

2) How long does it take to work?

Some effects may be felt within hours, but the full benefit is usually seen with regular daily use. If you feel no improvement or your symptoms worsen, contact your healthcare team.

3) Can I take it with my inhalers?

Many people take Theo-24 Cr alongside inhalers (controller and reliever inhalers). However, confirm your full regimen with your healthcare professional, because some combinations can increase side effects or require monitoring.

4) What happens if I miss a dose?

Take it when you remember unless it is close to the next dose. Do not take a double dose. If unsure, ask a pharmacist.

5) Should I avoid caffeine?

Large amounts of caffeine (coffee, tea, energy drinks) may increase stimulation and may contribute to side effects such as tremor or insomnia. Keeping intake consistent and moderating is sensible. If you have side effects, reduce caffeine and seek advice.

6) Can I drink alcohol?

It’s best to limit alcohol. Heavy drinking can affect the body and may increase the chance of adverse effects. If you notice symptoms after alcohol, contact a clinician promptly.

7) Why does smoking matter?

Smoking can change the way theophylline is metabolised, potentially lowering levels and reducing effectiveness. Stopping or starting smoking can therefore change how you respond—tell your clinician if your smoking status changes.

8) Do I need blood tests?

Some people do, particularly if the dose is being adjusted, if you have risk factors for higher levels (for example older age, liver problems), or if you have interacting medicines. Your clinician will decide what monitoring is appropriate.

9) What side effects mean I should stop and seek help?

Seek urgent help for symptoms such as severe palpitations, seizures, severe confusion, or persistent vomiting. Contact a clinician promptly for significant worsening tremor, insomnia, or gastrointestinal distress.

10) What are the common reasons for theophylline toxicity?

Common contributors include taking too high a dose, interactions with certain medicines, changes in smoking status, liver impairment, or dehydration from illness (vomiting/diarrhoea). That’s why dose adjustments and monitoring can be important.

Summary

Theo-24 Cr (theophylline) is a controlled-release medicine used for long-term management of certain breathing conditions, such as asthma and/or COPD, when appropriate. It works by relaxing airways and supporting improved airflow. Because it has potential for significant side effects—especially if blood levels become too high—safe use depends on the right dose, correct timing, and avoiding interactions (including some antibiotics, antifungals, and other medicines), as well as keeping caffeine and alcohol intake sensible.

If you have questions about your dose schedule or interactions with other medicines, speak to your pharmacist or healthcare professional.