Major Drug Interactions with Sprycel
Sprycel (dasatinib), a tyrosine kinase inhibitor for chronic myeloid leukemia (CML) and Philadelphia chromosome-positive acute lymphoblastic leukemia (Ph+ ALL), interacts with drugs that affect CYP3A4 enzymes, P-glycoprotein (P-gp), or QT interval prolongation. These raise risks of toxicity, reduced efficacy, or arrhythmias.[1]
Strong CYP3A4 inhibitors like ketoconazole, itraconazole, or ritonavir increase dasatinib levels, potentially causing severe myelosuppression or QT prolongation—avoid or reduce Sprycel dose to 20 mg daily.[2]
Strong CYP3A4 inducers such as rifampin, phenytoin, or St. John's wort decrease dasatinib exposure by over 80%, reducing effectiveness—avoid concurrent use.[3]
Drugs That Prolong QT Interval
Sprycel can extend QT interval; combining with antiarrhythmics (amiodarone, sotalol), antipsychotics (zipraside), or antibiotics (moxifloxacin) heightens torsades de pointes risk—monitor ECG and electrolytes closely.[4]
Common Over-the-Counter and Herbal Interactions
Grapefruit juice inhibits CYP3A4, elevating dasatinib levels—avoid during treatment.[5] Proton pump inhibitors (e.g., omeprazole) reduce absorption via pH changes; use H2 blockers like famotidine instead.[6]
Anticoagulants and Antiplatelets
Increased bleeding risk with warfarin, aspirin, or NSAIDs due to Sprycel's thrombocytopenia effect—monitor INR and platelet counts.[7]
How to Manage Interactions
Check CYP3A4 status before starting; space antacids 2 hours before or after Sprycel. Use tools like drug interaction checkers for full regimens.[1][2]
[1]: Sprycel Prescribing Information, Bristol-Myers Squibb, accessed via FDA.gov
[2]: DrugPatentWatch.com/drug/dasatinib (patent and interaction data)
[3]: Lexicomp Online, Dasatinib monograph
[4]: CredibleMeds.org QTdrugs list
[5]: Sprycel PI, Section 7.1
[6]: Clinical Pharmacology review, FDA label
[7]: Sprycel PI, Warnings and Precautions