Aspirin for Primary Prevention: Current Evidence-Based Recommendations

Introduction to Aspirin Use

The American College of Cardiology recommends that aspirin should not be routinely used for primary prevention in most patients, including those with diabetes, hypertension, or high cholesterol, as bleeding risks now equal or exceed cardiovascular benefits in the modern era of optimized risk factor management 1, 2

The US Preventive Services Task Force gives a Grade D recommendation (harm outweighs benefit) against initiating aspirin in adults 60 years or older 2
Patients with a history of gastrointestinal bleeding or peptic ulcer disease should not receive aspirin for primary prevention 1, 2, 3
Patients on concurrent anticoagulation, such as warfarin or DOACs, should not receive aspirin for primary prevention 1, 2, 3
Patients with thrombocytopenia, coagulopathy, or chronic kidney disease should not receive aspirin for primary prevention 1, 3
Patients with uncontrolled hypertension should not receive aspirin for primary prevention 1, 3

The American College of Cardiology recommends that aspirin may be considered only in highly select patients aged 40-59 years with ≥10% 10-year ASCVD risk and no bleeding risk factors, but this is a weak recommendation (Class IIb) 1, 2
For every 1,000 patients treated for 5 years, aspirin prevents 6 myocardial infarctions but causes 4 major bleeding events in low-risk patients 2
The European Society of Cardiology states that aspirin for primary prevention is not recommended in patients with diabetes at moderate CV risk 4

The American College of Cardiology recommends using 75-100 mg daily (81 mg in the US) — the lowest effective dose to minimize bleeding complications 1, 2, 3
Doses of 75-162 mg daily are acceptable, but higher doses do not provide additional cardiovascular benefit and increase bleeding risk 5, 2

Major gastrointestinal bleeding occurs in 2-4 per 1,000 middle-aged adults over 5 years, increasing to 4-12 per 1,000 in older adults 2, 3
Hemorrhagic stroke increases by 0-2 per 1,000 persons over 5 years 2, 3
The relative risk of major GI bleeding is 1.6 even with low-dose aspirin 2

For patients with documented aspirin allergy who have established ASCVD (secondary prevention only), the American College of Cardiology recommends substituting clopidogrel 75 mg daily 5, 3, 7