Which of the following can be given with dose adjustment?
**Core Concept**
Warfarin is an anticoagulant that works by inhibiting vitamin K-dependent clotting factors in the liver. Its dose needs to be adjusted to achieve a therapeutic international normalized ratio (INR) and minimize bleeding risk.
**Why the Correct Answer is Right**
Warfarin's dose needs to be adjusted when it is given with other medications that interact with it. One such medication is amiodarone, which can increase warfarin's effects by inhibiting its metabolism and enhancing its anticoagulant activity. This can lead to an increased risk of bleeding. Therefore, the dose of warfarin should be adjusted when amiodarone is added to the regimen.
**Why Each Wrong Option is Incorrect**
* **Option A:** Aspirin is a platelet inhibitor that can increase the risk of bleeding when given with warfarin. However, aspirin is typically not given with dose adjustment for warfarin; instead, the clinician might choose to use a lower dose of warfarin or closely monitor the patient's INR.
* **Option B:** Furosemide is a diuretic that does not significantly interact with warfarin. It may be given with warfarin without dose adjustment.
* **Option C:** This option is blank.
**Clinical Pearl / High-Yield Fact**
When initiating or adjusting warfarin therapy, it is essential to closely monitor the patient's INR and adjust the dose accordingly. A 1-mg increase in warfarin dose can increase the risk of major bleeding by 10-20%.
**Correct Answer:** A. Amiodarone.