Naturally occurring tertiary amine which competitively antagonises ACh at the muscarinic receptor, causing parasympatholytic effects.

Property Atropine
Class Naturally occurring tertiary amine. Muscarinic antagonist.
Uses Bradycardia, organophosphate poisoning, antisialogogue
Presentation Clear, colourless solution at 600μ Racemic mixture, with only the L-isomer active
Route of Administration IV
Dosing 600μg-3mg
Distribution 50% protein bound, VD
Metabolism Extensive hepatic hydrolysis
Elimination Renal elimination of metabolites and unchanged drug
Resp Bronchodilation, ↓ secretions
CVS HR due to ↑ AV nodal conduction, peaks within 2-4 minutes and lasts 2-3 hours
CNS Central anticholinergic syndrome, confusion, ↑IOP
MSK Inhibits sweating
GIT ↓ LoS tone


  1. Smith S, Scarth E, Sasada M. Drugs in Anaesthesia and Intensive Care. 4th Ed. Oxford University Press. 2011.
  2. Peck TE, Hill SA. Pharmacology for Anaesthesia and Intensive Care. 4th Ed. Cambridge University Press. 2014.
Last updated 2018-05-02

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