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Pharmacology · Special Pharmacology

Propanidid

Propanididum

Propanidid is an ultra-short-acting agent for non-inhalational general anesthesia. The drug provides immediate sleep onset without an excitation stage and is used primarily for induction of anesthesia or brief surgical procedures.

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Onset of action20–40 seconds after intravenous administration
Duration3–4 minutes (ultra-short-acting agent)
MetabolismRapid hydrolysis by plasma cholinesterase enzyme
Dosage formOily liquid in ampoules
3 min readFor medical studentsUpdated 09/24/2026
Material prepared by WhiteCoat Pro editorial team based on platform study guidesReviewed by medical editor: Aulov A. A., general practitioner · 09/24/2026

Pharmacokinetics and mechanism of action

In clinical pharmacology, propanidid (Propanididum) holds a special place due to its kinetic properties. This drug is available as an oily liquid packaged in ampoules for intravenous administration.

A key feature of the agent is its ultra-short duration of action. Once the solution enters the systemic circulation, the effect develops almost instantly: the onset of action is recorded within 20–40 seconds. At the same time, induction of anesthesia occurs completely smoothly—the excitation stage characteristic of many classical anesthetics is completely absent here.

The total duration of the surgical stage is only 3–4 minutes. Such a phenomenally short period of activity is explained by a specific biotransformation mechanism. Unlike drugs metabolized by hepatic enzymes (monoamine oxidase or pseudocholinesterase), propanidid undergoes rapid hydrolysis directly in the bloodstream. The main catalyst for this process is plasma cholinesterase, which rapidly cleaves the molecule, terminating its action.

Indications for use

The specific profile of the drug determines a fairly narrow, but highly demanded spectrum of indications:

  1. Induction of anesthesia. The drug is ideal for initiating general anesthesia. It provides rapid sedation of the patient without psychomotor agitation before transitioning to maintenance anesthesia.
  2. Short procedures. A duration of 3–4 minutes is sufficient to perform quick manipulations: biopsy sampling, reduction of traumatic dislocations, and tooth extraction.
  3. Ambulatory practice. Due to rapid plasma hydrolysis, patients recover rapidly. Clear consciousness returns within 2–3 minutes after the end of the drug's effect, and complete recovery of psychomotor functions takes no more than 20–30 minutes, which is critical for outpatient surgery.
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Side effects and complications

Administration of propanidid requires monitoring due to the risk of certain adverse reactions:

  • Respiratory system: the reaction is biphasic. First, short-term hyperventilation occurs, which is sharply replaced by respiratory depression—apnea (cessation of breathing) may develop for a period of 10 to 30 seconds.
  • Cardiovascular system: hemodynamic shifts in the form of tachycardia (increased heart rate) and decreased blood pressure (BP) are possible.
  • Neurological status: at the very beginning of anesthesia, short-term involuntary muscle twitching may be observed.
  • Local and allergic reactions: the drug has an irritating effect on the vascular wall, causing pain along the vein during injection. There is also an increased risk of allergic reactions.
How to memorize

"PROPANIDID DISAPPEARS from the blood in 3 minutes" — a reminder of the ultra-short action of the drug due to rapid destruction by plasma enzymes.

Class and exam questions

What causes the short duration of action of propanidid?

The effect lasts only 3–4 minutes, as the drug is rapidly destroyed via hydrolysis by plasma cholinesterase.

Does an excitation stage occur upon administration of this drug?

No, anesthesia occurs very quickly (after 20–40 seconds) and smoothly, completely bypassing the motor excitation stage.

How does the drug affect the respiratory center?

Immediately after administration, short-term hyperventilation occurs, which is then replaced by respiratory depression up to apnea lasting 10–30 seconds.

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What else to study on this topic

  • Mechanism of enzymatic hydrolysis by plasma cholinesterase
  • Comparative pharmacokinetics of intravenous anesthetics
  • Patient management tactics in case of post-injection apnea
  • Prevention measures for pain syndrome and phlebitis during intravenous administration

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