The nurse is assessing a client who is prescribed montelukast. Which clinical finding indicates the client is experiencing a therapeutic effect of the drug?

A. Hold medication if heart rate is greater than 60 bpm: Beta-blockers are typically held if the heart rate is less than 60 bpm, not greater. Administering the medication when the heart rate is above 60 bpm is generally safe, so this instruction is inaccurate.

B. Report signs of liver damage, including dark-colored urine: While some medications can affect liver function, beta-blockers rarely cause liver toxicity. Monitoring for liver damage is not a standard teaching point for typical beta-blocker use unless the client has preexisting liver disease.

C. Stop taking this medication if you experience dizziness: Abruptly stopping beta-blockers can precipitate rebound hypertension or tachycardia, which can be dangerous. Clients should be instructed to notify their healthcare provider rather than independently discontinuing the medication.

D. Sexual dysfunction may occur with this medication: Beta-blockers can cause side effects such as erectile dysfunction or decreased libido. Educating the client about potential sexual side effects helps set expectations and encourages open discussion with the healthcare provider if symptoms develop.

A. Regular laboratory monitoring is required: Warfarin therapy necessitates frequent monitoring of the international normalized ratio (INR) to ensure therapeutic anticoagulation and to prevent bleeding or clotting complications.

B. Inject this drug subcutaneously in the abdomen: Warfarin is administered orally, not via injection. Teaching injection techniques is not applicable and could cause confusion or medication errors.

C. Avoid medications containing aspirin: Aspirin and other NSAIDs can increase the risk of bleeding when taken with warfarin due to additive antiplatelet effects. Clients should be educated to avoid these medications unless approved by their healthcare provider.

D. Report heavy menstrual bleeding to the provider: Heavy or unusual bleeding is a potential sign of warfarin over-anticoagulation. Clients should be instructed to report such symptoms promptly for assessment and possible dosage adjustment.

E. There are no dietary interactions with warfarin: Warfarin interacts with foods high in vitamin K (e.g., leafy greens), which can affect its effectiveness. Clients should be educated on maintaining consistent dietary vitamin K intake rather than assuming no dietary interactions exist.