The nurse discusses discharge information for a client receiving aspirin. Which daily dosing instruction is prescribed for cardiac protection?

A. 650 mg: This dose is commonly used for analgesic or antipyretic purposes, such as relieving mild to moderate pain or fever. It is higher than the cardioprotective dose and carries a greater risk of gastrointestinal bleeding if used long-term for prevention. B. less than 4g daily: This represents the maximum daily limit for analgesic/antipyretic therapy in adults to avoid toxicity, particularly hepatotoxicity in combination products. It is not relevant to cardiovascular protection, which requires much lower dosing. C. 81 mg: A daily dose of 81 mg, often referred to as “baby aspirin,” is widely prescribed for cardioprotection. This low-dose regimen irreversibly inhibits platelet aggregation, reducing the risk of thrombus formation and myocardial infarction without causing significant analgesic or anti-inflammatory effects. D. 325 mg: This dose is commonly used for analgesia or antipyresis. While it can also provide antiplatelet effects, lower doses (81 mg) are preferred for long-term cardiovascular prophylaxis to minimize gastrointestinal and bleeding risks.