Ibrutinib

Brand Names: Imbruvica

Drug Class: Kinase Inhibitor

Overview

11 DESCRIPTION Ibrutinib is a kinase inhibitor. It is a white to off-white solid with the empirical formula C 25 H 24 N 6 O 2 and a molecular weight 440.50. Ibrutinib is freely soluble in dimethyl sulfoxide, soluble in methanol and practically insoluble in water. The chemical name for ibrutinib is...

Mechanism of Action

12 CLINICAL PHARMACOLOGY 12.1 Mechanism of Action Ibrutinib is a small-molecule inhibitor of Bruton’s tyrosine kinase (BTK). Ibrutinib forms a covalent bond with a cysteine residue in the BTK active site, leading to inhibition of BTK enzymatic activity. BTK is a signaling molecule of the B-cell antigen receptor (BCR) and cytokine receptor pathways. BTK’s role in signaling through the B-cell surface receptors results in activation of pathways necessary for B-cell trafficking, chemotaxis, and adhesion. Nonclinical studies show that ibrutinib inhibits malignant B-cell proliferation and survival in vivo as well as cell migration and substrate adhesion in vitro . 12.

Indications

  • 1 INDICATIONS AND USAGE IMBRUVICA is a kinase inhibitor indicated for the treatment of: Adult patients with chronic lymphocytic leukemia (CLL)/Small lymphocytic lymphoma (SLL) ( 1.1 ). Adult patients with chronic lymphocytic leukemia (CLL)/Small lymphocytic lymphoma (SLL) with 17p deletion ( 1.2 ). Adult patients with Waldenström’s macroglobulinemia (WM) ( 1.3 ). Adult and pediatric patients age 1 year and older with chronic graft versus host disease (cGVHD) after failure of one or more lines of systemic therapy ( 1.4 ). 1.

Common Doses

  • 420 mg
  • 240 mg
  • 70 mg
  • 1.2 mL

Dosage

2 DOSAGE AND ADMINISTRATION CLL/SLL and WM : 420 mg taken orally once daily ( 2.1 ). cGVHD : ◦ Patients 12 years and older: 420 mg taken orally once daily ( 2.1 ). ◦ Patients 1 to less than 12 years of age: 240 mg/m 2 taken orally once daily (up to a dose of 420 mg) ( 2.1 ). Tablets or capsules should be taken orally with a glass of water. Do not open, break, or chew the capsules. Do not cut, crush, or chew the tablets. See full prescribing information for oral suspension administration instructions ( 2.1 ). 2.

Contraindications

  • 4 CONTRAINDICATIONS None None ( 4 )

Side Effects

  • 6 ADVERSE REACTIONS The following clinically significant adverse reactions are described elsewhere in the labeling: Hemorrhage [see Warnings and Precautions ( 5.1 )] Infections [see Warnings and Precautions ( 5.2 )] Cardiac Arrhythmias, Cardiac Failure, and Sudden Death [see Warnings and Precautions ( 5.3 )] Hypertension [see Warnings and Precautions ( 5.4 )] Cytopenias [see Warnings and Precautions ( 5.5 )] Second Primary Malignancies [see Warnings and Precautions ( 5.6 )] Hepatotoxicity, including DILI [see Warning s and Precautions ( 5.

Interactions

  • 7 DRUG INTERACTIONS CYP3A Inhibitors: Modify IMBRUVICA dose as described ( 2.3 , 7.1 ). CYP3A Inducers: Avoid coadministration with strong CYP3A inducers ( 7.2 ). 7.1 Effect of CYP3A Inhibitors on Ibrutinib The coadministration of IMBRUVICA with a strong or moderate CYP3A inhibitor may increase ibrutinib plasma concentrations [see Clinical Pharmacology ( 12.3 )] . Increased ibrutinib concentrations may increase the risk of drug-related toxicity.