Which medication is NOT indicated to monitor INR as a side effect for warfarin?

Warfarin is an anticoagulant that requires careful monitoring of the International Normalized Ratio (INR) to ensure that patients remain within the therapeutic range and to minimize the risk of bleeding or clotting complications. Some medications can interact with warfarin and influence the INR, either by enhancing its anticoagulant effect or decreasing it.

Among the medications listed, hydralazine does not have a significant effect on INR levels or the pharmacodynamics of warfarin. It is primarily used as an antihypertensive agent and does not have the same interactions that can alter warfarin's efficacy.

In contrast, fluvastatin, quinolones, and orlistat can interact with warfarin. Fluvastatin, a statin used for lipid management, can increase INR in some patients due to its potential impact on liver enzymes that metabolize warfarin. Quinolones, a class of antibiotics, can also potentiate the effects of warfarin leading to a rise in INR. Orlistat, a weight loss medication, can interfere with the absorption of fat-soluble vitamins which may indirectly affect the metabolism of warfarin, thus influencing INR levels.

Therefore, hydralazine is the only medication listed that