Serious. These medicines may interact and cause very harmful effects. Contact your healthcare professional (e.g. doctor or pharmacist) for more information.
How the interaction occurs:
When these two medicines are taken together, your body may process one or both medicines more quickly.
What might happen:
Your blood levels of one or both medicines may decrease. This may decrease the beneficial effects of one or both medicines.
What you should do about this interaction:
If you experience problems with your breathing or seizures, contact your doctor. It may be necessary to adjust the dose of your medicines.Your healthcare professionals (e.g. doctor or pharmacist) may already be aware of this interaction and may be monitoring you for it. Do not start, stop, or change the dosage of any medicine before checking with them first.
1.Rosenberry KR, Defusco CJ, Mansmann HC Jr, McGeady SJ. Reduced theophylline half-life induced by carbamazepine therapy. J Pediatr 1983 Mar;102(3):472-4.
2.Mitchell EA, Dower JC, Green RJ. Interaction between carbamazepine and theophylline. N Z Med J 1986 Feb 12;99(795):69-70.