You must know before taking medicine! Detailed instructions for larotrectinib

1. Indications:

Larotrectinib is suitable for adult and pediatric patients carrying NTRK gene fusions, including but not limited to soft tissue sarcoma, infantile fibroma, lung cancer and other related tumors. The main function of this drug is to target NTRK kinase, block abnormal signaling pathways, and inhibit the growth and spread of tumors.

2. Mechanism of action:

Larotinib is a tyrosine kinase inhibitor that inhibits the activity of NTRK kinase by highly selectively targeting NTRK gene fusion. NTRKKinases are involved in regulating cell growth and differentiation under normal circumstances. However, in the case of fusion, the kinase activity loses normal regulation, promoting abnormal cell proliferation and survival signaling, leading to the development of tumors. Larotrectinib achieves therapeutic effects by blocking this abnormal signaling pathway.

3. Pharmacology:

Larotinib is rapidly absorbed into the body and reaches peak concentrations in plasma. It is highly bound to plasma proteins, and its metabolism is mainly mediated by CYP3Aenzyme to form major metabolites. Drugs and their metabolites are excreted via the kidneys. In terms of pharmacokinetics, larotrectinib exhibits linear and steady-state properties.

4. Dosage and usage:

Patients should take medications accurately according to the doctor's prescription. Generally, it is taken orally twice daily, with or without food. Dosage adjustments may be based on the patient's specific condition and doctor's recommendations, so patients should not adjust the dosage on their own.

5. Side effects:

Common side effects include fatigue, dizziness, nausea and other mild discomfort. In clinical trials, a small number of patients may experience adverse reactions such as elevated liver enzymes, anemia, and vomiting. Patients should pay close attention to their physical condition during medication and report to their doctor in time if they feel unwell.

6. Warnings and precautions:

1.Gene testing for NTRK gene fusion is required before use to ensure that the patient belongs to the indication group.

2.Pregnant women should use it under the guidance of a doctor and avoid using larotrectinib during pregnancy.

3.Interactions with specific drugs may occur, and patients should inform their doctors about other drugs they are taking before taking them.

7. Contraindications:

It is contraindicated in patients with allergies to larotrectinib ingredients. Before use, doctors should fully understand the patient's allergy history.

8. Drug interactions:

Larotinib may interact with some drugs, such as inhibitors or inducers of CYP3A4. Before taking this medication, patients should inform their doctor about other medications they are taking to avoid potential interactions.

9. Medication for special groups:

For elderly patients, patients with hepatic insufficiency and patients with renal insufficiency, the dose may need to be adjusted, and the specific medication regimen should be carried out under the guidance of a doctor.

10. Listing and price situation:

Larotrectinib has been launched in China and has not yet been included in medical insurance. Since it has not been launched in China for a long time, it may be difficult to purchase it in hospitals. For specific conditions, it is recommended to consult the local hospital pharmacy. In foreign markets, larotinib has two options: original drug and generic drug. Original drugs include the German version, the American version, the European version and the Hong Kong version, and the price is about 10,000 to 20,000 yuan. In comparison, generic drugs are much cheaper. There are Lao and Bangladeshi versions of generic drugs, and the price is around two to three thousand. It is worth noting that the ingredients of original drugs and generic drugs are basically the same.

The above is the main content of the instructions for larotrectinib. Patients must strictly follow the doctor's recommendations and prescriptions during use. If they have any discomfort or concerns, they should consult their doctor in time.