Which drugs may interact with gefitinib fumarate tablets?
Before taking any medication, you should inform your doctor in detail about all medications you are currently using and any existing health problems. Special attention should be paid to the interactions between the following three types of medications:
Potent enzyme inducers: including phenytoin, rifampin, and St. John's wort, these drugs may reduce the effective concentration of this drug in the blood;
Potent enzyme inhibitors: such as antibiotics and antifungal drugs like voriconazole, itraconazole, clarithromycin, and erythromycin, which may increase the blood concentration of this drug;
Specific receptor drugs: including antidepressants such as escitalopram, fluoxetine, and sertraline, this drug may weaken the therapeutic effect of these drugs.
Usage and dosage
This medication should be used under the guidance of a doctor and under medical monitoring. The generally recommended initial dose is 120 mg orally once daily (equivalent to 3 tablets of 40 mg each), with each complete course of treatment lasting 28 days. Specific medication regimens must be strictly followed according to the doctor's instructions.
What are the specific instructions for using gefitinib fumarate tablets?
Patients must undergo professional genetic testing before taking the medication:
This requires a peripheral blood or bone marrow sample to test for FLT3 gene mutations (by analyzing whether there are abnormal changes in a specific gene). Only patients confirmed to have this gene mutation are eligible for this drug treatment.
The following details should be noted during medication use:
The medication must be taken under the guidance of a doctor with experience in cancer treatment. The usual starting dose is 120mg per day (equivalent to 3 tablets of 40mg each), and 28 days of continuous use is considered a complete course of treatment.
Try to take the medication at the same time every day, either before or after meals. The tablets must be swallowed whole; do not break, chew, or crush them.
As long as the patient's condition continues to improve and no serious side effects occur, it is recommended to continue medication long-term. If intolerable side effects occur or the treatment effect diminishes, the doctor should be contacted promptly to adjust the treatment plan.
The effects of treatment may take a long time to appear, so even if there is no obvious improvement at the moment, you should not stop taking the medication or change the dosage on your own. You must strictly follow the medication plan prescribed by your doctor.
