Aspirin dosing in ACS is typically within which range?

• A. 81 mg
• B. 50 mg
• C. 325 mg
• D. 162-325 mg

Answer: (D)

In ACS, aspirin is given as a loading dose to rapidly block platelet thromboxane A2 production by irreversibly inhibiting COX-1. To achieve a quick, reliable antiplatelet effect, the recommended loading dose is 162 to 325 mg, usually chewed and taken right away so absorption is fast. After this, a low-dose maintenance of about 81 mg daily is used.

The other options aren’t the ideal acute loading dose: 81 mg is appropriate for long-term maintenance, not the initial rapid effect; 50 mg is too small to achieve quick platelet inhibition; 325 mg falls within the range but the standard phrasing emphasizes the full loading-dose window, which is 162–325 mg.