Correct Answer: B

Rationale: Smoking can interfere with the effectiveness of ranitidine and worsen ulcer symptoms. Clients should avoid smoking while taking this medication to ensure optimal therapeutic outcomes.

Correct Answer: C

Rationale: The correct answer is 'C: Eye damage.' Eye damage, such as retinopathy, is a severe adverse effect of Hydroxychloroquine, and clients should be informed to report any changes in vision immediately to prevent permanent visual impairment.

Correct Answer: B

Rationale: Grapefruit juice affects carbamazepine metabolism and should be avoided. It can lead to increased levels of the medication, potentially causing toxicity. Monitoring carbamazepine blood levels and the complete blood count (CBC) is essential to ensure the medication's efficacy and safety. Carbamazepine can cause serious adverse effects like Stevens-Johnson syndrome, which can be life-threatening. Therefore, the client should promptly report any rash to the healthcare provider. Additionally, the client should be educated about potential central nervous system (CNS) side effects such as drowsiness or dizziness, and advised to avoid activities requiring alertness until these effects diminish.

Correct Answer: A

Rationale: An INR of 4.0 is above the therapeutic range for a client on Warfarin, indicating an increased risk of bleeding. This finding requires immediate reporting to the provider for appropriate intervention to prevent complications associated with excessive anticoagulation.

Correct Answer: A

Rationale: Lidocaine is administered to prevent dysrhythmias by delaying conduction in the heart and reducing the automaticity of heart tissue. This action helps stabilize the heart's electrical activity and prevent life-threatening arrhythmias post-cardiac arrest.