Zydelig Generic Name & Formulations
Idelalisib 100mg, 150mg; tabs.
Phosphatidylinositol 3-kinase inhibitor.
Relapsed chronic lymphocytic leukemia (CLL), in combination with rituximab, in patients for whom rituximab alone would be considered appropriate due to other co-morbidities.
Limitations of Use
Not recommended for first-line treatment of CLL, small lymphocytic lymphoma (SLL), follicular lymphoma (FL), and other indolent non-Hodgkin lymphomas, or in combination with bendamustine and/or rituximab for FL, SLL, and other indolent non-Hodgkin lymphomas.
Zydelig Dosage and Administration
Swallow whole. ≥18yrs: initially 150mg twice daily (max); continue until disease progression or unacceptable toxicity. Dose modifications: see full labeling.
<18yrs: not established.
History of toxic epidermal necrolysis (TEN) with any drug.
Zydelig Boxed Warnings
Fatal and serious toxicities: hepatic, severe diarrhea, colitis, pneumonitis, infections, and intestinal perforation.
Hepatotoxicity: monitor ALT/AST every 2 weeks for the first 3 months, every 4 weeks for the next 3 months, then every 1–3 months thereafter; if ALT/AST >3×ULN, monitor weekly until resolved; if ALT/AST >5×ULN, withhold and continue monitoring weekly until resolved; if ALT/AST >20×ULN or bilirubin >10×ULN, discontinue permanently. Monitor for diarrhea or colitis; withhold if severe or hospitalization; discontinue permanently if life-threatening. Pneumonitis: monitor for pulmonary symptoms or a decline by >5% in oxygen saturation; if diagnosed, treat and discontinue permanently. Infections: monitor and interrupt if Grade ≥3. Treat infections before starting. Provide Pneumocystis jirovecii pneumonia (PJP) prophylaxis during treatment; interrupt if PJP infection is suspected and permanently discontinue if confirmed. Monitor patients with history of CMV infection or (+) baseline CMV serology; interrupt if CMV PCR (+) until resolved; if resumed, monitor for reactivation at least monthly. Discontinue permanently if intestinal perforation occurs. Monitor for severe cutaneous (eg, SJS, TEN, DRESS) or serious hypersensitivity reactions; permanently discontinue if occur. Monitor CBCs at least every 2 weeks for the first 6 months, and at least weekly if neutrophils <1.0Gi/L. Hepatic impairment: monitor. Embryo-fetal toxicity. Advise to use effective contraception during and for at least 1 month (females) or 3 months (males w. female partners) after the last dose. Pregnancy: exclude status prior to initiation. Nursing mothers: not recommended (during and for 1 month after the last dose).
Avoid concomitant drugs that can cause hepatotoxicity or diarrhea. May be potentiated by strong CYP3A inhibitors (eg, ketoconazole); use alternatives or monitor frequently for idelalisib toxicity. May be antagonized by strong CYP3A inducers (eg, rifampin); avoid. May potentiate CYP3A substrates (eg, oral midazolam); avoid.
Zydelig Adverse Reactions
Diarrhea, pyrexia, fatigue, nausea, cough, pneumonia, abdominal pain, chills, rash, neutropenia, ALT/AST elevations.
Zydelig Clinical Trials
Zydelig Patient Counseling