Aspirin is formulated in low-dosage 81 milligram tablets for use as a preventative treatment against heart attacks and strokes, reports eMedicineHealth. Aspirin has anticoagulant properties that help prevent blood clots from forming, reducing the risk of heart attack and stroke in susceptible individuals.
In general, doctors prescribe low-dose aspirin to individuals who have already suffered a heart attack or stroke in order to prevent future episodes from occurring, notes the Mayo Clinic. Individuals at greater risk for cardiovascular events, such as the elderly, smokers or those with high blood pressure, may also benefit from low-dose aspirin. In addition, 81 milligram aspirin tablets can be used for the usual conditions for which regular-strength aspirin is indicated, including headaches, pain and fever, according to WebMD.