The dosage of pyrotinib must strictly follow the doctor's instructions and is usually adjusted based on the patient's body weight, disease condition and treatment stage. The recommended daily dose ranges from 400 mg to 800 mg, administered orally in two divided doses (the specific number of tablets shall be calculated according to the drug specification). For example, if each tablet has a specification of 80 mg, a daily dose of 400 mg requires 5 tablets (taken in two separate doses). The actual dosage shall be determined on a case-by-case basis, and shall not be adjusted without authorization.
Common Factors Affecting Dosage
1.Disease type and stage:
The choice of dosage varies depending on different cancer types (e.g., breast cancer, gastric cancer) and disease stages.
2.Body weight and body surface area (BSA)
Physicians may calculate a more precise dosage based on the patient’s body weight or body surface area.
3.Hepatic and renal function
Patients with impaired hepatic or renal function may require dosage reduction.
Treatment response and adverse reactions: Dosage will be dynamically adjusted during treatment based on therapeutic efficacy and adverse reactions (e.g., diarrhea, skin rash).
Medication Precautions
Take at fixed times daily
It is recommended to take the medication at a fixed time every day to avoid missing doses or overdosing.
Swallow tablets whole
Tablets should generally be swallowed whole with meals or on an empty stomach; chewing or crushing is not recommended (please refer to the package insert for details).
Avoid abrupt discontinuation
Even if symptoms improve, the full course of treatment must be completed as prescribed to prevent disease recurrence.
Adverse Reactions and Management
Common adverse reactions include diarrhea, nausea, fatigue, etc. Mild symptoms can be relieved through dietary adjustments or symptomatic medications.
If severe diarrhea (≥ 4 episodes per day), dyspnea or abnormal liver function occurs, seek medical attention immediately.
Medical Guidance
Prescription drug regulations
Pyrotinib is a prescription drug and can only be purchased and used with a doctor’s prescription.
Regular follow-ups
During treatment, it is necessary to review blood routine, liver and kidney function and other indicators every 2–3 weeks.
Disclosure of drug interactions
If you are taking other medications (e.g., anticoagulants, antibiotics) at the same time, please inform your doctor in advance.
Any dosage adjustment must be made under the guidance of a physician; patients shall not increase, decrease or discontinue the dosage without authorization. If you have any questions about medication use, it is recommended to consult your attending physician through hospital outpatient services or online medical platforms.
