Major Drug Interactions with Eliquis
Eliquis (apixaban) is an anticoagulant that inhibits factor Xa, increasing bleeding risk when combined with drugs affecting clotting, CYP3A4 metabolism, or P-gp transport. Key interactions include:
- Strong CYP3A4 and P-gp inhibitors: Ketoconazole, ritonavir, itraconazole—reduce Eliquis clearance by up to 2-fold, requiring dose reduction or avoidance in high-risk patients.[1][2]
- Strong CYP3A4 inducers: Rifampin, carbamazepine, phenytoin—decrease Eliquis levels by 50% or more, potentially reducing efficacy; monitor or switch anticoagulants.[1][3]
- Other anticoagulants/antiplatelets: Aspirin, clopidogrel, warfarin, heparin—increase bleeding risk; use only if benefits outweigh risks, with close monitoring.[2][4]
- SSRIs/SNRIs: Fluoxetine, paroxetine, duloxetine—mildly elevate bleeding risk via platelet effects; caution in elderly or high-dose use.[2]
- NSAIDs: Ibuprofen, naproxen—heighten gastrointestinal bleed risk; limit duration and use lowest effective doses.[1][4]
How These Interactions Happen
Eliquis relies on CYP3A4 for metabolism (about 25%) and P-gp for efflux. Inhibitors block these, raising blood levels and bleed risk; inducers speed clearance, risking clots. Drug-drug interactions affect 20-30% of Eliquis users, per clinical data.[3]
Foods and Herbal Supplements to Avoid
- Grapefruit juice: Inhibits CYP3A4; avoid large amounts (>8 oz daily).[2]
- St. John's Wort: Strong inducer; reduces Eliquis effectiveness.[1]
- High vitamin K foods (kale, spinach): Minimal impact unlike warfarin, but consistent intake helps stability.[4]
No alcohol restriction, but excess (>3 drinks/day) raises bleed risk indirectly.[2]
What Happens If You Mix Them?
Bleeding events (major: 1-4% yearly baseline) can double with strong inhibitors; stroke risk rises with inducers. Symptoms include unusual bruising, blood in urine/stool, or prolonged bleeding. Seek immediate care.[1][3]
Managing Interactions While on Eliquis
- Use tools like Drugs.com checker or consult pharmacists for full lists.[4]
- Dose adjustments: Reduce to 2.5 mg BID with strong dual inhibitors in renal impairment.[2]
- Alternatives: Switch to dabigatran (less CYP3A4-dependent) or warfarin (reversible).[3]
- Regular INR/PT not needed for Eliquis, but monitor renal function (CrCl <30 mL/min worsens interactions).[1]
When to Talk to Your Doctor
Before starting NSAIDs, antibiotics (e.g., clarithromycin), or antifungals. High-risk groups: elderly, low weight (<60 kg), or creatinine >1.5 mg/dL.[2][4]
[1]: FDA Eliquis Label
[2]: Drugs.com Eliquis Interactions
[3]: Medscape Apixaban Interactions
[4]: UpToDate: Apixaban Drug Interactions