Does Sprycel Interact with Grapefruit Juice?
Yes, Sprycel (dasatinib) interacts with grapefruit juice. Grapefruit inhibits the CYP3A4 enzyme in the gut and liver, which metabolizes dasatinib. This raises dasatinib blood levels, increasing risks of side effects like QT prolongation, heart rhythm issues, and myelosuppression.[1][2]
How Serious Is the Interaction?
The interaction is moderate to major. Even small amounts of grapefruit juice (e.g., one glass) can boost dasatinib exposure by 20-50% or more, depending on timing and dose. Avoid grapefruit entirely during treatment and for 72 hours after your last Sprycel dose.[1][3]
What Happens If You Consume Grapefruit?
Elevated dasatinib levels heighten toxicity risks:
- Cardiac effects (QT prolongation, arrhythmias).
- Severe cytopenias (low blood counts).
- Fluid retention or pleural effusions.
Patients report nausea, fatigue, or bleeding in case reports tied to this interaction.[2][4]
Which Other CYP3A4 Foods or Drinks Affect Sprycel?
| Item | Effect | Recommendation |
|------|--------|----------------|
| Grapefruit juice | Strong CYP3A4 inhibitor | Avoid completely |
| Seville oranges | Similar to grapefruit | Avoid |
| Pomelos | Mild inhibitor | Limit or avoid |
| Starfruit | Potential inhibitor | Use caution |
No interaction with regular citrus like lemons or limes.[1][3]
Alternatives If You Like Grapefruit
Switch to non-interacting options like orange juice or cranberry juice. Check with your doctor or pharmacist for personalized diet tweaks.[2]
Official Guidance from Labeling
Sprycel's prescribing information states: "Avoid grapefruit products during DASATINIB treatment as they increase systemic dasatinib exposure." This aligns with FDA drug interaction checkers.[1][5]
[1]: Sprycel Prescribing Information (Bristol Myers Squibb)
[2]: Drugs.com - Dasatinib Interactions
[3]: FDA Drug Interactions Table
[4]: Medscape - Dasatinib Drug Interactions
[5]: DrugPatentWatch.com - Sprycel (Dasatinib) Patent and Exclusivity Details