Definition of Overdose

Overdose

An overdose occurs when a person takes a toxic amount of a substance — whether a medication, recreational drug, or other chemical — overwhelming the body's ability to process it. Depending on the substance, an overdose can depress breathing, disturb heart rhythm, cause seizures, or lead to respiratory or cardiac arrest.

Emergency management depends on the substance involved and may include supporting the airway and breathing, administering specific antidotes such as naloxone for opioids, and providing CPR if the person has no pulse. Rapid recognition, activation of emergency services, and supportive care are critical, and any suspected overdose warrants immediate professional medical evaluation.

CPR Certification Labs provides hands-on, American Heart Association–aligned CPR, BLS, ACLS, and PALS certification training to help providers master these life-saving skills.

Medical Definition & Meaning

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What the AHA CPR Certification Course Includes

Comprehensive CPR Training for Adults, Children, and Infants

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Proper Use of AED Devices for All Age Groups

Understand how to safely and effectively operate an Automated External Defibrillator (AED) for adults, children, and infants.

Airway Obstruction Relief and Heimlich Maneuver

Learn how to perform the Heimlich maneuver and clear airway obstructions caused by choking in both adults and infants.

Team-Based Multi-Rescuer CPR Techniques

Gain experience working as part of a team when more than one rescuer is available during an emergency.

Official American Heart Association CPR E-Card

Receive your AHA CPR Certification E-Card on the same day you complete the class and pass the exam.

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