Side Effects of Lapatinib - for the Consumer

Lapatinib

All medicines may cause side effects, but many people have no, or minor, side effects. Check with your doctor if any of these most COMMON side effects persist or become bothersome when using Lapatinib:

Back pain; diarrhea; dry skin; indigestion; mouth sores; nausea; redness and tingling of the hands and feet; tiredness; trouble sleeping; vomiting.

Seek medical attention right away if any of these SEVERE side effects occur when using Lapatinib:

Severe allergic reactions (rash; hives; itching; difficulty breathing; tightness in the chest; swelling of the mouth, face, lips, or tongue); dark urine; fast or irregular heartbeat; loss of appetite; pale stools; severe or persistent cough; severe pain, redness, or swelling of hands or feet; severe stomach pain or diarrhea; severe tiredness or weakness; shortness of breath; unusual bruising or bleeding; unusual itching; yellowing of the eyes or skin.