Theo-24 CR
Asthma, Chronic Obstructive Pulmonary Disease
400mg
Theo-24 CR is theophylline 400mg in a modified-release capsule for asthma and COPD, a methylxanthine that relaxes the bronchial muscle.
From$0.60/ tabletView
Theophylline
Theophylline is a bronchodilator sometimes used in selected asthma or chronic obstructive pulmonary disease plans. It is not a rescue medicine for a sudden severe attack.
Uniphyl CR
Asthma, Chronic Obstructive Pulmonary Disease
400mg
Uniphyl CR is theophylline 400mg as a modified-release tablet rather than a capsule, for asthma and COPD. It inhibits the phosphodiesterase enzymes.
From$0.57/ tabletView
Theo-24 SR
Asthma, Chronic Obstructive Pulmonary Disease
200mg
Theo-24 SR is theophylline at the lower 200mg modified-release strength for asthma and COPD, a xanthine that raises cyclic AMP in the airway.
From$1.33/ tabletView
Key points
- Theophylline has a narrow safe concentration range and may require blood-level monitoring.
- Fever, liver disease, smoking changes and many common medicines can rapidly alter exposure.
- Repeated vomiting, a fast or irregular heartbeat, severe agitation or a seizure needs urgent care.
Select a listed product and pack to order online. Supply depends on stock and destination rules; ask your doctor or pharmacist whether it suits you.
How it works
Theophylline inhibits phosphodiesterase and blocks adenosine receptors, relaxing airway smooth muscle and affecting breathing drive and inflammation.
Important safety checks
Heart-rhythm disease, epilepsy, liver disease, fever and all medicines require review. Antibiotics, seizure medicines and smoking can alter levels. Modified-release products are not automatically interchangeable. Do not take extra medicine for worsening breathing.
When to seek urgent care
Seek urgent help for repeated vomiting, marked tremor or agitation, a sustained fast or irregular heartbeat, fainting, confusion or a seizure. Severe breathlessness or poor response to the respiratory action plan needs emergency care.
Further reading
What is theophylline used for?
Theophylline is a bronchodilator used for some people with asthma or chronic obstructive pulmonary disease. It is not a rescue medicine for a sudden severe attack.
How does theophylline work?
Theophylline blocks the enzyme phosphodiesterase and adenosine receptors, which relaxes the smooth muscle in your airways and helps air flow more easily. It also reduces airway inflammation.
What theophylline products does SGMeds list?
Products containing theophylline on SGMeds include Theo-24 CR, Uniphyl CR and Theo-24 SR. Compare their forms, strengths and pack sizes.
What is theophylline called in other countries?
In other countries, theophylline is also sold as Nuelin SA and Slo-Phyllin. Brand names vary between countries, so compare products by their active ingredient.
How long does theophylline take to work?
Theophylline starts working within 1 to 2 hours, and its effect lasts 12 to 24 hours.
What are the side effects of theophylline?
Common side effects include nausea, headache and insomnia. A fast heartbeat or palpitations can also happen, and serious effects like an irregular heartbeat or a seizure need immediate medical attention.
Can theophylline be taken with other medicines?
Some antibiotics, seizure medicines, caffeine and tobacco can affect theophylline levels, so check with a doctor or pharmacist before you take anything else with it.
How much does theophylline cost in Singapore?
Each product on this page shows a price for each strength and pack size in Singapore dollars, converted from US dollars, so the exchange rate can change the final amount. Larger packs usually cost less per tablet.
Payment and prices →Do I need a prescription for theophylline in Singapore?
No. SGMeds does not ask for a prescription to order theophylline: we place the order with our pharmacy partner, which prepares it and arranges delivery on your behalf.
Ordering without a prescription →Do you deliver theophylline to Singapore?
Yes. We deliver to Singapore and Malaysia. Express shipping is tracked and takes up to 1 week, and Regular shipping takes up to 3 weeks.
How ordering works →