Cathejell With Lidocaine Drug Interactions

Using other medicines: Tell the doctor or pharmacist if the patient is taking/using or has recently taken/used any other medicines, including medicines obtained without a prescription.
Cathejell should not be used at the same time as other medicines containing lidocaine or certain other local anaesthetics (of the amide type), as this may enhance their respective effects in a unpredictable manner.
As there may be an enhanced effect on the heart, lidocaine should be used with caution in patients also receiving medication used to treat heart rhythm disorders (antiarrhythmics, e.g. mexiletine, tocainide), high blood pressure (beta-blockers, such as propranolol) or calcium channel blockers (e.g. diltiazem, verapamil).
No specific interaction studies have been performed with lidocaine and class III antiarrhythmics; however, caution is advised (see also Precautions), as the effects on the heart may be enhanced.
If the patient is taking cimetidine (which blocks stomach acid production), discuss this with the doctor before treatment with Cathejell. Using such medicines at the same time can increase the risk of side effects.