Theo-24 Sr
In brief
- In our pharmacy, you can buy Theo-24 Sr without a prescription, with delivery in 9–21 days throughout the United Kingdom. Discreet and anonymous packaging.
- Theo-24 Sr (theophylline) is used for long-term control of respiratory conditions like asthma, chronic bronchitis, and emphysema. It works as a bronchodilator by inhibiting phosphodiesterase and blocking adenosine receptors, relaxing airway muscles.
- The usual dosage for adults is 300–400 mg once daily, taken by mouth. Adjustments are required for elderly patients or those with liver/kidney impairment.
- Theo-24 Sr is administered as an extended-release capsule. Capsules must be swallowed whole; do not crush or chew. Take 1 hour before or 2 hours after meals.
- The effect begins within 1–2 hours after administration.
- The duration of action is up to 24 hours (due to extended-release properties).
- Avoid alcohol, as it may increase the risk of side effects like nausea or central nervous system disturbances.
- The most common side effects include nausea, vomiting, diarrhoea, headache, and restlessness.
- Would you like to try Theo-24 Sr without a prescription?
Product basics: Theo-24 Sr overview
| Property | Detail |
|---|---|
| International nonproprietary name (INN) | Theophylline |
| UK theophylline brands | Slo-Phyllin, Uniphyllin Continus (Theo-24 Sr is not a UK brand) |
| Available forms | Extended-release capsules (100mg, 200mg, 300mg, 400mg) |
| ATC classification | R03DA04 (Respiratory system xanthines) |
| Packaging | Bottles of 30, 60, or 100 capsules |
Theo-24 Sr contains theophylline, a xanthine derivative used as maintenance therapy for respiratory conditions. In the UK, it’s classified as prescription-only medication (POM) under MHRA regulation. The extended-release formulation in capsules allows steady medication levels throughout the day. Patients typically take one daily dose which gradually releases the active ingredient. Pharmacists should note Theo-24 Sr’s equivalence with other sustained-release theophylline products when advising patients.
Pharmacology: how Theo-24 Sr works
Theo-24 Sr works by inhibiting phosphodiesterase enzymes, increasing intracellular cyclic AMP. This action relaxes bronchial smooth muscle tissue, reducing airway resistance and easing breathing difficulties. The mechanism provides bronchodilation that typically begins within 1-2 hours after administration. Metabolism primarily occurs via CYP1A2 enzymes in the liver, creating active metabolites contributing to therapeutic effects.
Notable pharmacological characteristics include:
- Half-life: Between 6-10 hours in average adults
- Elimination: Primarily hepatic metabolism with renal clearance of metabolites
- Therapeutic window: Narrow (10-20 mcg/mL serum concentration)
Critical drug interactions require careful management. Quinolone antibiotics (like ciprofloxacin) and macrolides (such as erythromycin) significantly reduce theophylline clearance. Concurrent alcohol consumption causes unpredictable metabolism alterations. UK prescribing guidelines state plasma monitoring is essential when introducing interacting medications.
Approved uses and off-label applications
Theophylline is licensed in the UK for chronic asthma management and COPD maintenance therapy. The National Institute for Health and Care Excellence
| Condition | Starting dose | Maintenance range |
|---|---|---|
| Chronic asthma (adults) | 300-400mg daily | 400-600mg daily |
| COPD exacerbation prevention | 200mg daily | 300-400mg daily |
Off-label applications include specialist management of apnoea in premature infants – though Theo-24 Sr capsules aren’t suitable for neonatal administration without modification. Dose reductions become critical for patients over 65 due to slower drug clearance. Absolute contraindications exist for severe cardiovascular conditions including uncompensated heart failure.
Special populations: paediatrics, pregnancy, and comorbidities
Theo-24 Sr capsules are not suitable for children under 12 years due to unpredictable absorption patterns and increased toxicity risks. Juvenile asthma requires specialist-formulated liquid alternatives enabling precise dosing adjustments. During pregnancy, a risk cannot be ruled out. Use requires strict benefit-versus-risk assessment by respiratory specialists and obstetric consultants.
Comorbidity considerations profoundly impact dosing strategies:
Hepatic impairment
Regular serum theophylline level checks are important for elderly patients with comorbidities.
Dosage guidelines and individualisation
Theo-24 SR extended-release capsules provide controlled delivery throughout the day, simplifying dosing schedules. For adults with chronic bronchitis or COPD, treatment typically begins at 300-400mg daily as a single morning dose. This formulation isn’t appropriate for paediatric patients.
Individual circumstances require careful adjustment:
| Patient group | Dosing considerations | Monitoring recommendations |
|---|---|---|
| Liver impairment | Reduce to 50-75% of normal dose | Serum level testing every 4 weeks initially |
| Elderly patients | Start with 300mg daily | Check levels before dose increases |
Take doses consistently each morning on an empty stomach – at least one hour before or two hours after eating. Titration requires patience: blood level tests should verify steady concentrations before adjusting doses. Initial response assessment typically occurs after 3-5 days. Avoid exceeding 400mg daily without therapeutic drug monitoring due to theophylline toxicity threshold concerns.
Administration instructions and handling
Correct administration ensures Theo-24 SR works as designed. Swallow capsules whole with water – never crush, chew, or open them, as this destroys the extended-release mechanism leading to dangerously rapid absorption. Food interactions significantly affect performance: high-fat meals can cause sudden dose dumping, risking toxicity.
If you forget your dose: • If remembered within 4 hours of usual time, take immediately • If remembered later, skip until next morning • Never double doses
Store capsules at room temperature (15–25°C) in their original tightly-sealed container. Protect from moisture and avoid bathroom storage. Heat above 30°C compromises stability. Check expiry dates monthly – return outdated medications to pharmacies.
Safety profile: warnings and adverse reactions
Theo-24 SR carries serious safety considerations requiring vigilance. Toxicity becomes increasingly likely above serum concentrations of 20 micrograms/mL and can be fatal. Adverse reactions escalate rapidly beyond this threshold – seizures and cardiac arrhythmias are medical emergencies requiring immediate attention.
Common reactions include: • Persistent nausea and vomiting • Headaches disrupting daily activities • Tachycardia exceeding 100bpm at rest • New-onset insomnia or restlessness • Nervous tremors affecting coordination
Less frequent but serious complications include gastric ulcers and unexpected behavioural changes. Regular serum level monitoring is recommended: schedule tests every 6-12 months during long-term therapy and after any dose change. Alert your GP immediately about rapid heartbeat or persistent vomiting – recognising theophylline toxicity symptoms early prevents hospitalisation.
Alternatives
According to British Thoracic Society/SIGN asthma guidelines, inhaled therapies are preferred to oral theophylline. Long-acting inhaled bronchodilators such as salmeterol generally give better asthma control with fewer side effects than oral bronchodilators like Theo-24 SR. Patients needing an oral alternative can discuss aminophylline or roflumilast (for COPD) with their doctor.
FAQ: patient questions answered
Can Theo-24 replace my Ventolin inhaler?
No – it shouldn’t replace rescue inhalers. Ventolin remains first-line treatment for acute asthma attacks according to NICE respiratory guidance. Theo-24 requires hours to achieve peak bronchodilation effect.
Coffee consumption while taking Theo-24?
Large amounts of caffeine should be avoided, as caffeine competes for the same metabolic pathways and adds to the risk of side effects.
Guidelines for proper use
Administer your capsule consistently each morning to maintain stable blood levels. Empty stomach administration remains preferable though important exceptions exist for patients experiencing gastrointestinal upset. Avoid these practices: – Consuming high-fat meals within 90 minutes of dosing – Smoking tobacco (accelerates medication clearance) – Combining with OTC stimulants like decongestants Original containers provide the best protection against humidity, so avoid storing them in the bathroom. Critical safety considerations include never crushing capsules and maintaining scheduled blood level monitoring appointments when prescribed higher doses. Consult your community pharmacist annually for medication safety reviews and access the printed patient information leaflet accompanying each prescription.
