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Thiopental

PENTOTHAL

Thiopental ballicule: receptor binding, kinetics and half-life diagram
Mechanism of action: Thiopental ballicule
Thiopental PENTOTHAL mascot mnemonic cartoon
Visual mnemonic: Thiopental mascot
“Pen too tall (on) Thigh opener”
barbs → barbiturate

What it isUltra-short-acting barbiturate; induction of anesthesia and raised intracranial pressure.

Why this oneIt reduces cerebral metabolic rate more than any other induction agent.

What limits itHypotension and apnea; it accumulates on repeated dosing. No longer marketed in the US.

Thiopental molecular structure (skeletal formula)
Molecular structure: Thiopental

FDA-approved for

NO BOXED WARNINGS

Principal riskHypotension and apnea; accumulation on repeat dosing

Classes and tags

Clinical profile

Therapeutic safety burden3 / 4
Overdose danger3 / 4
Weight-gain liability0 / 4
Sedation liability4 / 4
QT / Torsades0 / 4
Direct muscarinic antagonism0 / 4
Embryofetal risk2 / 4

Defining liabilityAbrupt respiratory depression and cardiovascular collapse

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