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Pharmacology Toxicology & Autonomics Beginner
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Anticholinergic Toxidrome Signs

BLIND
AS
A
BAT
MAD
AS
A
HATTER
Rhyme summarizing competitive muscarinic receptor blockade seen with diphenhydramine, tricyclic antidepressants, and belladonna alkaloids.

Anticholinergic agents block peripheral muscarinic receptors (sweat glands, ciliary muscles, salivary glands) and central cholinergic circuits.

Systematic Breakdown

Blind

Blind as a bat (Mydriasis & Cycloplegia)

Dilated, poorly reactive pupils with paralysis of ciliary accommodation.

Mad

Mad as a hatter (Delirium & Hallucinations)

Acute central anticholinergic delirium, disorientation, auditory/visual hallucinations, mumbling speech.

Red

Red as a beet (Flushed Skin)

Cutaneous vasodilation in facial and trunk vessels trying to dissipate internal heat without sweating.

Hot

Hot as a hare (Hyperthermia)

Inability to sweat (anhidrosis) prevents normal evaporative cooling.

Dry

Dry as a bone (Anhidrosis & Xerostomia)

Completely dry mouth, dry axillae, and dry skin (absence of sweat differentiates from sympathomimetic toxicity).

Full

Full as a flask (Urinary Retention)

Detrusor relaxation causes painful, acute bladder distension and constipation.

High-Yield Clinical Pearls & Exam Tips
  • Key differentiator: Sympathomimetic toxicity (cocaine, amphetamines) presents with DIAPHORESIS, whereas anticholinergic toxicity presents with DRY SKIN.
  • Physostigmine is a tertiary amine acetylcholinesterase inhibitor that crosses the blood-brain barrier; used for severe refractory central anticholinergic toxicity.
Related Pharmaceuticals
Atropine Diphenhydramine Amitriptyline Scopolamine Physostigmine
Related Clinical Conditions
Anticholinergic Toxicity Jimson Weed Poisoning TCA Overdose
Authoritative Sources: Katzung Basic & Clinical Pharmacology 15e · Goldfrank's Toxicologic Emergencies

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Aminoglycoside Major Toxicities

N O T

The three classical adverse effect categories of aminoglycoside antibiotics (Gentamicin, Tobramycin, Amikacin).

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CRAP GPS

Cytochrome P450 Enzyme Inducers

CRAP GPS

Classic mnemonic for agents that induce hepatic microsomal enzymes, accelerating metabolism of co-administered drugs.

Katzung Basic & Clinical Pharmacology 15e 2,325

System Notice

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