What is the typical aspirin dose and route used for acute management?

• A. 81 mg PO daily
• B. 650 mg IV
• C. 162-324 mg PO (chewed)
• D. 500 mg PO

Answer: (C)

In acute management, the goal is rapid platelet inhibition to reduce thrombus formation during suspected ACS or acute MI. Aspirin does this by irreversibly inhibiting COX-1, lowering thromboxane A2 and platelet aggregation. To get a fast antiplatelet effect, give a non-enteric-coated oral dose of about 162–325 mg and have the patient chew it. Chewing increases surface area and speeds absorption, so the effect kicks in within minutes—crucial in the acute setting. This is different from maintenance therapy, which uses a much smaller daily dose (81 mg) after stabilization. An intravenous aspirin dose isn’t standard for acute management, and a single 500 mg oral dose isn’t the typical recommended plan. If chewing isn’t possible, swallowing a 325 mg tablet is acceptable, but chewing is preferred for the quickest onset.