Theophylline (Uniphyllin Continus) Key Facts And Dosing Guide
Comprehensive guide to Uniphyllin Continus: uses, dosage, side effects, and key considerations for asthma and COPD management.
Uniphyllin Continus is a brand name for prolonged-release tablets containing theophylline, a methylxanthine bronchodilator used to treat and prevent bronchospasm associated with asthma, chronic obstructive pulmonary disease (COPD), and chronic bronchitis. It is indicated for adults and children aged 6 years and above, particularly when symptoms persist despite other therapies.
About theophylline tablets
Theophylline, marketed as Uniphyllin Continus, belongs to the xanthine class of drugs. It relaxes bronchial smooth muscles, improving airflow in the lungs. Unlike short-acting bronchodilators, Uniphyllin Continus provides sustained release, maintaining steady theophylline levels over 12-24 hours for better symptom control, especially during morning dips in lung function common in asthma and COPD patients.
The drug is not a first-line treatment for asthma in children due to its narrow therapeutic index and variable pharmacokinetics. It is reserved for cases where higher dosages are needed, patients have comorbidities impairing clearance, or it is combined with drugs affecting its metabolism.
Key facts
- Drug class: Xanthine bronchodilator (ATC code: R03DA04).
- Forms: Prolonged-release tablets (200mg, 300mg, 400mg).
- Duration: Effects last 12-24 hours; taken once or twice daily.
- Therapeutic range: Narrow (5-15 mcg/mL); requires serum monitoring.
- Bioavailability: Nearly 100%; peak levels ~5 hours post-dose.
- Common uses: Asthma, COPD, chronic bronchitis, and sometimes cardiac failure.
When to take theophylline
Uniphyllin Continus is typically taken every 12 hours, swallowed whole without chewing or crushing to preserve the prolonged-release mechanism. A larger dose can be given in the evening or morning to target peak symptom times, such as nighttime or early morning bronchospasm.
For patients not on theophylline, add the total daily dose as a single evening or morning administration if daytime or nighttime symptoms persist despite other treatments.
How to take it
Always follow your doctor’s instructions. Tablets must be taken with water, upright, and not with food that delays absorption like high-fat meals. Do not alter the dosing schedule abruptly. Dose titration is often needed due to individual variability in metabolism influenced by age, smoking, liver function, and genetics.
Dosage
Dosage varies by age, weight, smoking status, and condition. Initial dosing aims for steady-state serum levels of 10-20 mg/L (55-110 micromol/L), monitored 5 days after starting or dose changes.
| Patient Group | Initial Dose (mg/kg/day) | Max Dose (mg/kg/day) |
|---|---|---|
| Adults (non-smokers) | 10-13 | <13 (up to 18 in some) |
| Adult smokers | 15 | <20 |
| Children 6-9 years | 14.5 | <20 |
| Children 9-12 years | 14 | <20 |
| Children 12-16 years (non-smokers) | 13 | <18 |
| Elderly/Cardiac failure | Lower end of range | Adjust per levels |
Note: Divide total daily dose into 12-hour intervals. Adjust based on serum levels and clinical response. For COPD with cor pulmonale, clearance is reduced (0.48 mL/kg/min).
Getting the most from it
Maintain consistent dosing times. Inform your doctor of lifestyle changes like starting/stopping smoking, as smokers metabolize theophylline faster, requiring higher doses. Regular serum monitoring ensures levels stay therapeutic without toxicity. Combine with inhaled therapies for optimal control.
Side effects
Theophylline has a narrow therapeutic window; toxicity risks rise above 20 mg/L. Common side effects include nausea, headache, insomnia, and tremor. Serious effects involve cardiac arrhythmias, seizures, and hypokalemia.
| Frequency | Symptoms |
|---|---|
| Common (>1/100) | Headache, insomnia, nausea, vomiting, epigastric pain, tremor, irritability. |
| Uncommon | Tachycardia, palpitations, hypotension. |
| Rare (<1/10,000) | Arrhythmias, seizures, rhabdomyolysis. |
| Metabolic | Hypokalemia, hyperglycemia, acidosis. |
Report persistent symptoms to your doctor. Hypokalemia can worsen with beta-agonists or steroids.
Cautions
- Avoid in acute porphyria.
- Caution in peptic ulcer, hypothyroidism, hyperthyroidism, liver disease, cardiac failure.
- Monitor closely in fever, viral infections, cystic fibrosis.
- Not for first-line pediatric asthma.
- Pregnancy: Use only if benefits outweigh risks (category C).
- Breastfeeding: Enters milk; monitor infant for irritability.
Interactions
Theophylline interacts with many drugs via CYP1A2 inhibition/induction. Key interactions:
- Increase levels: Ciprofloxacin, enoxacin, fluvoxamine (avoid or reduce dose).
- Decrease levels: Smoking, phenytoin, rifampicin.
- Others: Inhibits adenosine effects; potentiates hypokalemia with beta-agonists; arrhythmias with halothane.
- Lithium: Increases clearance.
Adjust doses and monitor levels with any changes.
Other medicines, food and drink
Alcohol may enhance CNS effects. High-carb/low-protein diets slow clearance; caffeine competes for metabolism. Avoid St. John’s Wort. Inform your doctor/pharmacist of all medications, including over-the-counter.
Common questions
Who can and cannot take theophylline tablets?
Suitable for adults and children >6 years with asthma/COPD. Contraindicated in hypersensitivity, acute porphyria. Use cautiously in elderly, liver/heart disease.
How and when to take theophylline tablets?
Every 12 hours, whole tablets. Morning/evening dosing for symptom peaks.
Possible side effects of theophylline tablets
Nausea, headache, tachycardia; monitor for toxicity signs like seizures.
Is theophylline safe in pregnancy?
Limited data; use if essential, monitor levels.
What happens if I overdose?
Symptoms: Vomiting, arrhythmias, seizures. Seek emergency care; treat supportively, monitor potassium, use diazepam for convulsions.
Can I drive on theophylline?
May cause dizziness; avoid if affected.
What if I forget a dose?
Take as soon as remembered unless near next dose; do not double.
Can I drink alcohol with it?
Avoid or limit; increases side effects.
About prolonged-release tablets
Uniphyllin Continus uses a matrix for zero-order release, providing steady theophylline delivery. Do not break/chew; ensures bioavailability ~100% with peaks at 5 hours.
Pharmacology
Theophylline inhibits phosphodiesterase (III/IV), raising cAMP, relaxing airways, reducing inflammation via T-lymphocyte enhancement and eosinophil suppression. Also stimulates myocardium for cardiac output in heart failure.
Monitoring
Serum levels: Trough before morning dose after 5 days. Target 10-20 mg/L. Check at 6-12 months or with changes.
References
- UNIPHYLLIN 200mg prolonged release tablets – Summary of Product Characteristics — electronic Medicines Compendium (emc). 2023-05-15. https://www.medicines.org.uk/emc/product/100850/smpc
- Theophylline: Uses, Interactions, Mechanism of Action — DrugBank Online. 2024-01-10. https://go.drugbank.com/drugs/DB00277
- Theophylline – StatPearls — NCBI Bookshelf, National Center for Biotechnology Information. 2023-07-17. https://www.ncbi.nlm.nih.gov/books/NBK519024/
- Theophylline (oral route) – Mayo Clinic — Mayo Clinic. 2024-02-01. https://www.mayoclinic.org/drugs-supplements/theophylline-oral-route/description/drg-20073599
- Theophylline: MedlinePlus Drug Information — MedlinePlus, U.S. National Library of Medicine. 2023-11-20. https://medlineplus.gov/druginfo/meds/a681006.html
- Theophylline – Asthma + Lung UK — Asthma + Lung UK. 2023-09-12. https://www.asthmaandlung.org.uk/symptoms-tests-treatments/treatments/theophylline
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