Dosage
They contain the active ingredient theophylline which belongs to a group of medicines called bronchodilators. Bronchodilators help stop you wheezing and being breathless. Theophylline also reduces swelling in the lungs of asthma patients and relieves the feeling of ?tightness? in their chest.
These tablets may be taken by adults and children aged 6 years and above.
You should take your tablets every 12 hours. For instance, if you take a tablet at 8 o?clock in the morning, you should take your next tablet at 8 o?clock in the evening.
Adults

The recommended starting dose for adults is one 200 mg tablet every 12 hours. Your doctor may increase your dose to one 300 mg or 400 mg tablet every 12 hours, depending upon how you respond to treatment. If you are elderly your doctor may suggest a lower dose.

Different doses will also be required if you have certain other medical conditions. Your doctor may ask you to have regular blood tests to ensure you are taking the correct dose.
Use in children

Children over six years of age can take these tablets. The required dose will depend on their weight, age and the severity of their breathing problems. This should be discussed with your doctor, pharmacist or nurse.

Do not exceed the dose recommended by your doctor. Check with your doctor, pharmacist or nurse if you are not sure.
For possible side effects, interactions & warnings click here.