Lapatinib can raise the level of Digoxin in the body. In one study, the amount of an oral Digoxin dose reaching the blood rose about 2.8 times when Lapatinib was also taken.
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 these together. They may check you more closely or change the plan.