The normal daily aspirin dose for an adult can range from 81 milligrams, the standard amount in a baby aspirin, to a regular strength 325-milligram tablet, states Mayo Clinic. Doctors determine the dosage based on individual medical history.
Daily aspirin use can help prevent a heart attack by diminishing the blood's ability to clot, according to Mayo Clinic. Platelets, a component of blood, work by forming a clot at the site of a torn blood vessel, to stop bleeding. Use of aspirin can help prevent the blocking of a burst heart blood vessel affected by atherosclerosis, thereby potentially preventing a heart attack.