# A 65-year-old client is being instructed about rivaroxaban 20 mg orally once daily for stroke prevention in atrial fibrillation. Which administration instruction is most important?

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> subject: Medical Emergencies  
> category: PA

## Question

A 65-year-old client is being instructed about rivaroxaban 20 mg orally once daily for stroke prevention in atrial fibrillation. Which administration instruction is most important?

## Option

1. Take the 20 mg dose with the largest meal of the day (typically dinner) at the same time each day to ensure adequate bioavailability and consistent drug levels. **✔ Correct answer**
2. If the tablet is difficult to swallow whole, you may crush it and mix it with a small amount of applesauce or apple juice to help with administration.
3. If you forget a dose, omit it and take the next dose at the usual time; taking a missed dose later could lead to an increased risk of bleeding complications.
4. Take rivaroxaban on an empty stomach, at least 1 hour before or 2 hours after meals, to maximize absorption and achieve predictable anticoagulant effects.

**Correct answer: 1**

## Explanation

Rivaroxaban administration — food matters at 15 / 20 mg
Rivaroxaban is a direct factor Xa inhibitor. Bioavailability differs by dose:
• 10 mg: ~80–100% bioavailability — can be taken with or without food.
• 15 mg and 20 mg: bioavailability drops to ~66% on an empty stomach but reaches ~100% when taken WITH food. Patients on 15 / 20 mg must take with the largest meal of the day to ensure therapeutic levels and avoid stroke breakthrough.
• Take at approximately the same time daily to maintain steady plasma levels.

Other key teaching:
• Missed dose: if a once-daily dose is missed, take it as soon as remembered on the same day; if not, skip and take next day at usual time. For twice-daily dosing (DVT/PE treatment 15 mg BID), if a dose is missed, take it as soon as remembered to ensure 30 mg total per day, then resume regular schedule.
• Crushing: rivaroxaban tablet CAN be crushed and mixed in apple sauce or water (and given via NG tube), but must be followed immediately by food if the dose is 15 / 20 mg.
• Drug interactions: avoid strong CYP3A4 + P-gp dual inhibitors (ketoconazole, ritonavir) and inducers (rifampin, St. Johns wort, phenytoin, carbamazepine).
• Bleeding precautions, do NOT self-discontinue, surgery hold per provider, andexanet alfa for major bleeding reversal.

## In-depth explanation

Clinical reasoning summary
Rivaroxaban administration — food matters at 15 / 20 mg
Rivaroxaban is a direct factor Xa inhibitor. Bioavailability differs by dose:
• 10 mg: ~80–100% bioavailability — can be taken with or without food.
• 15 mg and 20 mg: bioavailability drops to ~66% on an empty stomach but reaches ~100% when taken WITH food. Patients on 15 / 20 mg must take with the largest meal of the day to ensure therapeutic levels and avoid stroke breakthrough.
• Take at approximately the same time daily to maintain steady plasma levels.

Other key teaching:
• Missed dose: if a once-daily dose is missed, take it as soon as remembered on the same day; if not, skip and take next day at usual time. For twice-daily dosing (DVT/PE treatment 15 mg BID), if a dose is missed, take it as soon as remembered to ensure 30 mg total per day, then resume regular schedule.
• Crushing: rivaroxaban tablet CAN be crushed and mixed in apple sauce or water (and given via NG tube), but must be followed immediately by food if the dose is 15 / 20 mg.
• Drug interactions: avoid strong CYP3A4 + P-gp dual inhibitors (ketoconazole, ritonavir) and inducers (rifampin, St. Johns wort, phenytoin, carbamazepine).
• Bleeding precautions, do NOT self-discontinue, surgery hold per provider, andexanet alfa for major bleeding reversal.

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