Rapatinib, as a GIST targeted drug, commonly has side effects such as fatigue, hair loss, and hand foot syndrome, which require targeted management. Its adverse reactions involve multiple systems, some of which require medical intervention, while mild symptoms can be alleviated through lifestyle adjustments. The following provides a detailed explanation from three aspects: common reactions, serious side effects, and corresponding measures.

Common side effects and coping strategies

(1) Fatigue: About 20% of patients experience it. It is recommended to engage in activities at different times and maintain moderate rest. If accompanied by fever or continuous aggravation, seek medical attention to rule out complications such as infection.

(2) Hair loss: It is mostly mild and reversible. Use mild shampoo products and avoid high-temperature styling tools. You can consult a doctor to use hair growth agents or wear wigs to improve your appearance.

(3) Hand foot syndrome: manifested as redness, swelling, and flaking. It is necessary to reduce hand foot friction and use urea ointment to moisturize. In severe cases, dosage adjustment or medication suspension is required.

Serious side effects to be wary of

(4) Cardiovascular toxicity: Sudden chest pain and QT interval prolongation require immediate discontinuation of medication and monitoring of electrocardiogram, especially when combined with other cardiotoxic drugs.

(5) Liver injury: Regularly check liver function. If jaundice or constipation occurs, seek medical attention immediately. It is recommended to monitor transaminase levels every 2 weeks during the first month of treatment.

(6) Hyperuricemia: Joint swelling and pain or pink urine indicate elevated uric acid levels, requiring increased water intake and the use of uric acid lowering drugs if necessary.

Daily management suggestions

(7) Avoid driving: During medication, it is prohibited to operate machinery or work at heights as it may cause dizziness or balance disorders.

(8) Sunscreen measures: Long term use of medication increases the risk of skin cancer. It is necessary to use SPF50+sunscreen and avoid direct sunlight.

(9) Drug interaction: It is forbidden to consume grapefruit fruits to prevent the inhibition of CYP3A4 enzyme and abnormal increase in blood drug concentration.