An overdose of aspirin means you have too much aspirin in your body.
This can happen in two ways:
If a person accidentally or intentionally takes a very large dose of aspirin at one time, it's called an acute overdose.
If a normal daily dose of aspirin builds up in the body over time and causes symptoms, it's called a chronic overdose. This may happen if your kidneys do not work correctly or when you are dehydrated. Chronic overdoses are usually seen in older patients during hot weather.
Acetylsalicylic acid
Acetylsalicylic acid (aspirin) can be found in many prescription and over-the-counter pain relievers, including:
Ford MD. Clinical Toxicology. 1st ed. Philadelphia, Pa: WB Saunders; 2001.
Marx J. Rosen’s Emergency Medicine: Concepts and Clinical Practice. 6th ed. St. Louis, Mo: Mosby; 2006.