Correct Answer: A

Rationale: To calculate the volume to administer, divide the desired dose by the available concentration. In this case, (80 mg / 10 mg/mL) = 8 mL.

Correct Answer: A

Rationale: Hydralazine is a vasodilator that can cause reflex tachycardia as an adverse effect. The client should monitor their pulse and report any significant increases, as tachycardia can indicate a severe adverse reaction to the medication.

Correct Answer: C

Rationale: Extrapyramidal effects are movement disorders that can be caused by certain medications affecting the central nervous system. These effects can include symptoms like tremors, rigidity, and bradykinesia. Medications like typical antipsychotics are known to induce extrapyramidal effects by interfering with dopamine transmission in the central nervous system.

Correct Answer: A

Rationale: The correct instruction for a client with a new prescription for Phenytoin is to brush and floss their teeth regularly. Phenytoin is known to cause gingival hyperplasia, a condition that affects the gums. By maintaining good oral hygiene practices such as regular brushing and flossing, the client can help minimize the risk of developing this side effect.

Correct Answer: C

Rationale: Aspirin inhibits platelet aggregation, which can increase the effect of anticoagulants like warfarin, leading to an elevated risk of bleeding. Therefore, the concurrent use of aspirin and warfarin is generally contraindicated due to this potential interaction.