Podcast 1024: Caffeine Toxicity

Contributor: Taylor Lynch, MD Educational Pearls: Excessive caffeine intake can be dangerous. For normal adults, the toxicity level starts at 1000mg, which is equivalent to about 10 cups of coffee or 5 celsius drinks.  For normal adults, lethal levels are about 5-10 grams, which is equivalent to about 50-100 cups of coffee. Most of these outcomes are not from drinking caffeine, but instead concentrated caffeine pills. For children, toxic levels are 15mg per kg of the child.    Within the last 10 years 20-40 deaths due to caffeine intake have been reported. This may be lower than the actual number due to cardiac arrests that potentially could have been caused from caffeine intake.    Clinical presentation of caffeine toxicity can present in many ways. Most common symptoms include agitation and jitteriness The far end of the spectrum includes seizures, tachydysrhythmias, and eventually cardiovascular collapse.   Caffeine is a part of the methylxanthine class.  Caffeine is a phosphodiesterase inhibitor, which causes the release of calcetamines that act on your beta-2 receptors. This activates the sodium potassium ATPase and causes potassium to shift intracellular.  The clinical presentation of this mechanism is a patient with low potassium and agitation.   Treatments for toxic caffeine levels include: Replacing potassium, but slowly since the total potassium levels in the body are normal and will eventually return to normal once the caffeine wears off. Benzodiazepines Activated charcoal Dialysis, since caffeine is dialyzable References National Center for Biotechnology Information. "PubChem Compound Summary for CID 2519, Caffeine" PubChem, https://pubchem.ncbi.nlm.nih.gov/compound/Caffeine. Accessed 9 July, 2026.  Murray A, Traylor J. Caffeine Toxicity. [Updated 2025 Feb 6]. In: StatPearls [Internet]. Treasure Island (FL): StatPearls Publishing; 2026 Jan-. Available from: https://www.ncbi.nlm.nih.gov/books/NBK532910/ Cyril Willson, The clinical toxicology of caffeine: A review and case study, Toxicology Reports, Volume 5, 2018, Pages 1140-1152, ISSN 2214-7500, https://doi.org/10.1016/j.toxrep.2018.11.002.   Summarized by Aaryn David | Edited by Aaryn David & Ahmed Abdel-Hafiz, NREMT-P Donate: https://emergencymedicalminute.org/donate/   Join our mailing list: http://eepurl.com/c9ouHf   Golf Fundraiser: https://www.zeffy.com/en-US/ticketing/emergency-medical-minute-charity-golf--2026