What are the side effects of neratinib/neratinib (He Li'an)?

Neratinib/Neratinib (Neratinib) is an irreversible HER2 tyrosine kinase inhibitor, mainly used to treat patients with HER2-positive breast cancer. Although it has shown significant efficacy in prolonging recurrence-free survival and controlling disease progression, there are still certain adverse reactions during use, which require high attention from patients and doctors. The most common side effects are gastrointestinal symptoms, especially diarrhea, with an incidence rate higher than 50%. They are most obvious in the early treatment phase and usually occur 2–4 weeks before medication. If diarrhea is not treated in time, it may lead to dehydration, electrolyte imbalance, and weight loss. Therefore, it is often recommended to use antidiarrheal drugs in combination or adjust the dosage according to the patient's tolerance.

In addition to diarrhea, nausea, vomiting, and loss of appetite are also common adverse reactions, which are related to the stimulating effect of the drug on the gastrointestinal mucosa. Some patients may experience fatigue, weakness and headache. These symptoms are mostly mild to moderate, but they still require regular monitoring during long-term treatment. Because neratinib can affect liver metabolism, some patients may experience elevated transaminases or elevated bilirubin. Therefore, liver function tests should be performed before and during treatment to detect abnormalities in time and adjust the medication regimen.

In addition, skin-related side effects are also common, including rash, itching, and hand-foot syndrome. Although most are mild to moderate, if it is accompanied by skin ulceration or severe inflammation, the dose needs to be suspended or adjusted. Regarding the blood system, some patients may develop neutropenia or anemia, but these are relatively rare.

Overall, the side effects of neratinib are manageable, and through early intervention, symptom monitoring, and dose adjustment, most patients can safely complete the course of treatment. Doctors usually develop a comprehensive management plan based on individual patient conditions, including diarrhea prevention medication, regular liver function monitoring, and skin care guidance, thereby reducing the risk of adverse reactions while ensuring efficacy.

Reference materials:https://en.wikipedia.org/wiki/Neratinib