Foster Drug Interactions

Tell the doctor if the patient is taking or has recently taken any other medicines including medicines obtained without a prescription. Some medicines may increase the effects of Foster and the doctor may wish to monitor the patient carefully if the patient is taking these medicines (including some medicines for HIV: ritonavir, cobicistat).
Do not use beta blockers with this medicine. Beta blockers such as atenolol, propranolol and sotalol are used to treat a number of conditions including high blood pressure and heart conditions such as abnormal heart rhythms and heart failure; timolol is used to treat glaucoma. If the patient needs to use beta blockers, including beta blockers in eye drops, the effect of formoterol may be reduced or formoterol may not work at all. On the other hand, using other beta adrenergic drugs (drugs which work in the same way as formoterol) may increase the effects of formoterol.
Using Foster together with: medicines for treating abnormal heart rhythms (quinidine, disopyramide, procainamide), medicines used to treat allergic reactions (antihistamines), medicines for treating symptoms of depression or mental disorders such as monoaminoxidase inhibitors (for example phenelzine and isocarboxazid), tricyclic antidepressants (for example amitriptyline and imipramine), phenothiazines can cause some changes in the electrocardiogram (ECG, heart trace). They may also increase the risk of disturbances of heart rhythm (ventricular arrhythmias).
Medicines for treating Parkinson's Disease (L-dopa), to treat an underactive thyroid gland (L-thyroxine), medicines containing oxytocin (which causes uterine contraction) and alcohol can lower the heart's tolerance to beta-2 agonists, such as formoterol.
Monoaminoxidase inhibitors (MAOIs), including drugs with similar properties like furazolidone and procarbazine, used to treat mental disorders, can cause a rise in blood pressure.
Medicines for treating heart disease (digoxin) can cause a fall in the blood potassium level. This may increase the likelihood of abnormal heart rhythms.
Other medicines used to treat asthma (theophylline, aminophylline or steroids) and diuretics (water tablets) may cause a fall in the potassium level.
Some anaesthetics can increase the risk of abnormal heart rhythms.