Be careful when using lidocaine with antiarrhythmic drugs like tocainide, because their toxic effects add up.
These medicines are often taken together with some care. Your doctor may change a dose, space them apart or check on you more often. Make sure your doctor and pharmacist know you take both.
What to do: Ask your doctor or pharmacist before using lidocaine with heart rhythm medicines like tocainide, as their harmful effects can add up.