Uniphyl Cr (Theophylline) — Patient Information
Uniphyl Cr contains theophylline, a medicine used to help open up the airways and make breathing easier in certain long-term lung conditions. “Cr” stands for controlled release, meaning the medicine is designed to release theophylline slowly over time to help maintain steadier levels in the body.
This guide is written for people using this medicine in the United Kingdom. It explains how Uniphyl Cr works, how it is used, timing and practical tips, potential interactions (including with alcohol and other medicines), safety information, and common questions.
Quick product facts
| Item | Information |
|---|---|
| Active ingredient | Theophylline |
| Brand | Uniphyl Cr |
| Formulation | Controlled release (Cr) |
| Typical use | Long-term asthma/COPD management in selected patients |
| When it works | Helps keep airways open over several hours (not a “fast reliever”) |
| Monitoring | Sometimes requires blood level checks due to narrow safety margin |
| Key safety note | Dose and interactions matter—seek advice before changing anything |
What is Uniphyl Cr used for?
Uniphyl Cr is used as an add-on medicine for long-term respiratory disease when symptoms are not fully controlled with other standard therapies. Depending on your condition and your clinician’s plan, theophylline may be used for:
- Asthma in selected adults (and some older children/adolescents under specialist guidance), usually when additional control is needed.
- Chronic obstructive pulmonary disease (COPD), typically as part of long-term management.
It is important to remember: theophylline is generally not the medicine you use to stop a sudden asthma attack. Your fast-acting “reliever” inhaler (such as a short-acting beta2-agonist) remains the standard for acute symptoms.
How Uniphyl Cr works (mechanism of action)
Theophylline works in several ways to improve breathing:
- Relaxing airway smooth muscle to reduce constriction and help airways widen.
- Anti-inflammatory effects in the lungs, which may help reduce swelling over time.
- Improving breathing patterns and mucus clearance, contributing to better airflow.
- Increasing the response to other airway signals, supporting overall bronchodilation.
Because Uniphyl Cr is controlled release, it aims to provide steadier theophylline levels rather than sharp peaks and dips. This can help improve tolerability and effectiveness.
Pharmacokinetics: how the body processes theophylline
Understanding the basics of how theophylline moves through the body can help explain why dose changes and interactions are important. “Pharmacokinetics” describes absorption, distribution, metabolism, and elimination.
Absorption
As a controlled release product, theophylline is absorbed gradually from the gut. This usually results in a more stable concentration over time compared with immediate-release formulations.
Distribution
Theophylline distributes throughout body tissues. It may bind to proteins, and its levels can vary between individuals.
Metabolism (breakdown)
Theophylline is largely metabolised by the liver. Enzyme activity in the liver can be influenced by:
- Other medicines
- Cigarette smoking status
- Liver function and certain illnesses
Elimination (removal)
Theophylline is cleared from the body through metabolic pathways and excretion of metabolites. Reduced clearance can increase blood levels and the chance of side effects.
Narrow therapeutic range
Theophylline is known to have a narrow therapeutic range (the difference between effective and potentially harmful levels can be small). That is why clinicians may use blood tests for theophylline levels in some situations.
Typical timing and how to take Uniphyl Cr
Uniphyl Cr is designed for controlled release. Timing depends on your prescribed schedule, but common patterns include taking it once or twice daily to maintain steady levels.
General timing principles
- Take at the same times each day to keep levels consistent.
- Try not to miss doses. If you do, follow the advice given to you by your healthcare professional.
- Swallow whole with water. Do not crush or chew controlled release tablets unless you have been specifically told it is safe.
What to do if a dose is missed
If you miss a dose, take it when you remember unless it is close to the time for your next dose. Avoid doubling up. When in doubt, ask a pharmacist for guidance.
Food interactions: what to know
Food can influence the absorption and side effects of many oral medicines. With theophylline, the overall effect can vary between individuals. As a practical approach:
- Take Uniphyl Cr consistently with respect to meals (e.g., always with food or always on an empty stomach) unless advised otherwise.
- If stomach upset occurs, taking it with food may help—however, confirm the approach with your clinician or pharmacist.
- Avoid sudden dietary changes that might affect your routine.
Also be cautious with foods or drinks containing high amounts of caffeine (such as some energy drinks or large quantities of coffee/tea), as they may worsen side effects such as palpitations or restlessness.
Alcohol interactions
Alcohol can affect breathing, sleep, and safety, and may also influence theophylline levels indirectly (for example through effects on the liver or hydration). It can also make some side effects more noticeable.
Practical advice:
- Try to avoid heavy or binge drinking.
- If you drink alcohol, do so in moderation and pay attention to symptoms such as nausea, dizziness, tremor, or palpitations.
- If you have been told you need blood level monitoring, discuss how alcohol fits into your routine.
Medicine interactions (including key classes)
Interactions are one of the most important safety topics for theophylline. Some medicines can raise theophylline levels, increasing the risk of side effects. Others can lower theophylline levels, reducing effectiveness.
Always tell your pharmacist or clinician about all medicines you take, including:
- Prescription medicines
- Over-the-counter products
- Herbal remedies and supplements
- Inhalers and other respiratory medicines
Medicines that may increase theophylline levels
Examples (not exhaustive) include some antibiotics and other medicines that affect liver enzymes. Increased theophylline can lead to toxicity.
- Certain antibiotics (for example, some macrolides such as clarithromycin/erythromycin)
- Cimetidine (a medicine used for stomach acid in some cases)
- Some antifungals
- Some anticonvulsants (depending on the medicine, interaction may differ)
Medicines that may decrease theophylline levels
- Some medicines used for epilepsy or to speed up liver metabolism
- Rifampicin (a tuberculosis antibiotic)
- Smoking can lower theophylline levels; stopping smoking may raise levels
Other respiratory medicines
Uniphyl Cr is often used alongside inhalers (controller medications and relievers). Your plan may include:
- Inhaled corticosteroids and long-acting bronchodilators (common for asthma/COPD control)
- Short-acting bronchodilators for quick relief
- Other add-on treatments depending on your symptoms
If you notice a change in symptom control, do not adjust theophylline dosing yourself—speak to a healthcare professional.
Indications: when theophylline may be considered
Theophylline may be chosen when a patient needs additional bronchodilation or symptom control despite optimised standard therapy. This can include situations where:
- Symptoms remain insufficiently controlled
- There is a clinical need for an oral add-on medication
- Other options are not suitable, not tolerated, or not available
Your clinician will consider factors that affect theophylline risk (age, liver health, smoking status, and interacting medicines). In some people, blood level monitoring may be recommended.
Dosing guidance (general information)
Dosing must be individualised. Theophylline dose requirements vary widely due to metabolism differences and interactions. For this reason, the most important “dose guidance” is to follow the dosing schedule provided for you.
General principles
- Start low and increase gradually when appropriate, to improve tolerability.
- Use the controlled release tablet exactly as instructed (do not crush/chew).
- Blood tests may be used to ensure levels remain in a safe and effective range, especially with risk factors.
- Dose changes should be clinician-led, particularly if you start/stop smoking or begin new medicines.
Special circumstances affecting dose
- Liver disease may reduce clearance and increase risk.
- Heart problems may increase sensitivity to side effects like palpitations.
- Age and overall health can influence metabolism.
- Smoking (starting/stopping) can significantly change levels.
- Acute illness (for example fever) may affect metabolism.
Safety profile: side effects and when to seek help
Theophylline can cause side effects, and because of its narrow therapeutic range, it is important to recognise warning signs of excessive levels.
Common or mild side effects
- Nausea, vomiting
- Headache
- Heartburn or stomach discomfort
- Tremor (shakiness)
- Restlessness or difficulty sleeping
- Feeling flushed
More serious side effects (seek urgent medical advice)
Contact urgent care or seek medical help promptly if you experience symptoms that could indicate toxicity or a significant rhythm problem, such as:
- Severe or persistent vomiting
- Marked palpitations, fast heartbeat, or chest discomfort
- Seizures
- Confusion or feeling faint
- Uncontrolled shaking
If any severe symptoms occur, do not wait for the next dose.
When to speak to a pharmacist or clinician soon
- Side effects are interfering with daily life
- Your inhaler needs are increasing
- You have started a new medicine or stopped an interacting one
- You are unwell (especially with fever or severe stomach upset)
Practical use tips (making Uniphyl Cr easier to manage)
- Keep a medication routine: use a daily alarm or pill organiser (only for the medicines you have been told it is safe to organise).
- Do not change smoking habits abruptly without advice: if you stop or start smoking, theophylline levels can change.
- Check before starting new products: ask a pharmacist before using cough/cold remedies, herbal stimulants, or supplements.
- Limit caffeine and energy drinks: they can add to side effects.
- Keep track of symptoms: improved breathing should build over time; if you are not improving, seek review rather than increasing dose.
- Keep appointments for monitoring: if blood level checks have been suggested, attend them.
Alternative options (what else may be used)
Treatment for asthma and COPD is tailored to severity and response. Alternatives depend on your diagnosis, current therapy, and past response to medicines. Possible alternatives include:
Asthma alternatives
- Inhaled corticosteroids (controller basis)
- Long-acting beta2-agonists (LABA) usually combined with inhaled steroids
- Other add-on therapies depending on phenotype (e.g., leukotriene receptor antagonists, specialist biologics)
- Other oral options in selected circumstances
COPD alternatives
- Long-acting bronchodilators such as LABA/LAMA combinations
- Inhaled corticosteroids for certain risk profiles
- Other oral or inhaled add-ons as judged appropriate
If you are considering switching from theophylline to another therapy, make the change only with professional advice—stop/start decisions require careful planning.
United Kingdom market and legal context
In the UK, medicines are regulated by the Medicines and Healthcare products Regulatory Agency (MHRA) under established governance. Availability can depend on product licence, formulation, and pharmacy supply rules.
For respiratory conditions, national guidance and clinical pathways often emphasise inhaled therapies and symptom-based review. Theophylline may be used in selected cases, but due to its interaction profile and narrow safety margin, it is generally not a first-choice option for everyone.
Recent guidance (high-level)
While guidance can vary between asthma and COPD pathways and is updated over time, recent practice commonly focuses on:
- Optimising inhaler technique and adherence
- Regular review of symptom control and exacerbations
- Using medicines with a favourable safety profile when appropriate
- Where theophylline is used, ensuring risk assessment and considering blood level monitoring in suitable patients
Your local clinician can align the plan with current UK recommendations and your personal risk factors.
Delivery and availability in the UK
Uniphyl Cr availability may vary by strength and formulation in the UK market. Online pharmacies typically:
- Provide stock-dependent delivery options
- Offer estimated delivery times based on location
- Confirm product details before dispatch
Delivery times depend on courier schedules and whether the item is in local or regional stock. If you need it quickly, check the order page for the latest delivery estimate.
For accuracy, always verify that the strength and dosing instructions match your prescription/plan.
Uniphyl Cr FAQ
1) Is Uniphyl Cr a reliever inhaler?
No. Uniphyl Cr is a controlled release tablet used for long-term management. It is not intended to stop sudden breathing problems quickly. Use your prescribed/issued fast reliever for acute symptoms.
2) How long does it take to work?
Some people notice benefits within days, while fuller control may take longer as the medicine and other treatments are adjusted. If you do not feel any improvement, seek review rather than changing dose yourself.
3) Can I crush or split Uniphyl Cr?
Controlled release tablets are usually meant to be taken whole. Do not crush or chew unless your healthcare professional or the product guidance specifically allows it.
4) What should I do if I drink coffee/tea or energy drinks?
Keep caffeine intake consistent and avoid large amounts or energy drinks if you notice side effects such as palpitations, tremor, or insomnia. Discuss your caffeine habits with a pharmacist if you are unsure.
5) Can I drink alcohol while taking theophylline?
Moderate alcohol may be possible for some people, but avoid heavy drinking. Alcohol can increase the risk of side effects and can affect the body’s handling of medicines. If you have symptoms like nausea, dizziness, or palpitations after drinking, seek advice.
6) Why is my dose being adjusted or monitored with blood tests?
Theophylline levels can be affected by liver metabolism, illness, age, and interacting medicines. Because the safety range is narrow, blood testing helps confirm levels remain in a safer, effective range for your body.
7) What symptoms could suggest theophylline levels are too high?
Warning signs include persistent vomiting, significant tremor, marked palpitations, confusion, severe dizziness, or seizures. If these occur, seek urgent medical help.
8) Does smoking affect Uniphyl Cr?
Yes. Smoking can lower theophylline levels. If you stop smoking (or change smoking patterns), your theophylline levels may rise. Inform your healthcare professional so your plan can be reviewed if needed.
9) What if I’m starting a new medicine or antibiotics?
Many drugs can interact with theophylline. Always ask your pharmacist before starting a new medicine, including antibiotics, antifungals, stomach acid medicines, cough/cold products, and herbal supplements.
10) Can Uniphyl Cr be used during pregnancy or breastfeeding?
Theophylline use during pregnancy or breastfeeding depends on individual circumstances and risk–benefit assessment. Speak to a healthcare professional for personal guidance.
11) Is there anything I should avoid while taking Uniphyl Cr?
Avoid sudden changes in caffeine intake and smoking habits, and avoid taking interacting medicines without advice. Also follow the controlled release instructions carefully (do not crush/chew).
12) Who should take extra care?
Extra care may be needed if you have liver disease, significant heart rhythm problems, are elderly, have a history of side effects, or take medicines known to interact with theophylline. Your clinician/pharmacist can tailor monitoring and dosing.
Important patient reminder
This page provides general information and does not replace personalised advice. If you are unsure about dosing, timing, or interactions, speak to a pharmacist or other healthcare professional. If you experience severe symptoms, seek urgent medical attention.
