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Lapatinib and Alcohol/Food Interactions

There are 2 alcohol/food/lifestyle interactions with lapatinib.


lapatinib food

Moderate Food Interaction

Take lapatinib on an empty stomach 1 hour before or 1 hour after a meal unless otherwise directed by your doctor. This will make it easier for your body to absorb the medication. The lapatinib dose is administered once daily and should not be divided. The usual dose of lapatinib is equal to 5 tablets. You may swallow each tablet one at a time, but take the entire lapatinib dose at the same time each day. If you are receiving therapy with lapatinib you should be advised to avoid grapefruits and grapefruit juice. Grapefruit can raise the levels of lapatinib in your body and lead to dangerous side effects.

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High Blood Pressure (Hypertension)

Moderate Potential Hazard, Moderate plausibility

HER2 inhibitors - CHF

Decreases in left ventricular ejection fraction (LVEF) have been reported with agents that block HER2 activity. Patients who have received prior anthracyclines, those who received anthracycline after stopping therapy with agents that block HER2 activity, or patients who received prior radiotherapy to the chest area may be at higher risk of decreased LVEF. Therapy with these agents should be administered cautiously in patients with a previous history of heart conditions. Evaluate cardiac function before, during, and upon completion of treatment. Withhold or discontinue therapy with agents that block HER2 activity as appropriate, and for a confirmed clinically significant decrease in left ventricular function, or if the LVEF has not improved or has declined further. It is recommended to monitor overall cardiac function and LVEF by echocardiogram or MUGA scan as appropriate.


  1. "Product Information. Herceptin (trastuzumab)." Genentech (2001):
  2. "Product Information. Tykerb (lapatinib)." Novartis Pharmaceuticals (2007):
  3. "Product Information. Perjeta (pertuzumab)." Genentech (2012):
  4. "Product Information. Kadcyla (ado-trastuzumab emtansine)." Genentech (2022):
  5. "Product Information. Margenza (margetuximab)." Almirall (2021):
View all 5 references

Lapatinib drug interactions

There are 597 drug interactions with lapatinib.

Lapatinib disease interactions

There are 9 disease interactions with lapatinib which include:

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Drug Interaction Classification

These classifications are only a guideline. The relevance of a particular drug interaction to a specific individual is difficult to determine. Always consult your healthcare provider before starting or stopping any medication.
Major Highly clinically significant. Avoid combinations; the risk of the interaction outweighs the benefit.
Moderate Moderately clinically significant. Usually avoid combinations; use it only under special circumstances.
Minor Minimally clinically significant. Minimize risk; assess risk and consider an alternative drug, take steps to circumvent the interaction risk and/or institute a monitoring plan.
Unknown No interaction information available.

Further information

Always consult your healthcare provider to ensure the information displayed on this page applies to your personal circumstances.