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CEN Toxicology Review 2025/2026 | 100+ Solved Questions with Rationales | Antidotes, Overdose Syndromes, Neurotoxicity, Cardiotoxicity & Emergency Pharmacology

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This intensive CEN Toxicology 2025/2026 study guide presents over 100 solved questions and answers covering high-yield toxicologic emergencies, poisons, and antidote interventions aligned with the Certified Emergency Nurse (CEN) exam blueprint. It’s tailored for nurses preparing for certification or needing a concise, practical review of the most critical poisoning scenarios encountered in emergency departments. Major focus areas include: Anticholinergic & Cholinergic Syndromes: Classic toxidromes, signs like "hot as a hare," SLUDGE symptoms, and antidotes like physostigmine or atropine Sympathomimetic & Depressant Toxicity: Effects of stimulants (e.g., cocaine, amphetamines) vs. sedatives (e.g., benzodiazepines, opioids) Cardio-Active & Neurotoxic Drugs: Tricyclic antidepressants (QRS widening, seizures), beta-blockers, calcium channel blockers, digoxin, and seizure management Common Agents & Antidotes: Opioids → Naloxone Benzodiazepines → Flumazenil Acetaminophen → N-acetylcysteine (NAC) Iron → Deferoxamine Methanol/Ethylene glycol → Fomepizole or ethanol Heavy metals → Dimercaprol Warfarin → Vitamin K Toxic Vitals Clues & Mnemonics: FAST, PACED, CT SCAN, SLOW, COPS, COOLS, etc. for assessing heart rate, blood pressure, temperature, respiration, and pupil size in overdose patients This resource includes clinically realistic questions with rationales and mechanisms of action, vital for acute recognition, treatment, and pharmacologic reasoning in poisoning cases. Recommended for: Nurses preparing for the CEN exam or BCEN certifications Emergency nurses, critical care RNs, and toxicology specialists Nursing students in advanced pharmacology or emergency clinicals Paramedics and EMS professionals handling prehospital toxic exposures Keywords: CEN, toxicology, poisoning management, antidotes, cholinergic crisis, anticholinergic syndrome, sympathomimetic toxidrome, opioid overdose, benzodiazepine toxicity, salicylate poisoning, TCA overdose, emergency pharmacology, toxidrome mnemonics, vital signs in overdose, emergency nurse exam prep

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CEN TOXICOLOGY 2025/2026 EXAM
QUESTIONS AND ANSWERS | 100%
PASS



Anticholinergics [not producing fluids/blood to heart, lungs and brain] syndrome

(antihistamines, bronchodilators, cyclic antidepressants, SLEEP AIDS) -

🧠ANSWER ✔✔Hot as a hare (hyperthermia)


Red as a beet (flushed)

Dry as a bone [ANHYDROSIS (dry skin, urinary retention)

Blind as a bat (mydriasis)

Mad as a hatter (hallucinations, delirium, myoclonic jerking)




The antidote for anticholinergic toxicity is physostigmine salicylate. Physostigmine

is the only reversible acetylcholinesterase inhibitor capable of directly

antagonizing the CNS manifestations of anticholinergic toxicity; it is an uncharged

tertiary amine that efficiently crosses the blood-brain barrier

,What does muscular rigidity cause - 🧠ANSWER ✔✔rhabdomylosis syndrome due

to a direct or indirect muscle injury. It results from the death of muscle fibers and

release of their contents into the bloodstream (myoglobin). This can lead to renal

(kidney) failure.

sympathomimetic [fight or flight/shunt blood going to heart/brain/lungs] -

🧠ANSWER ✔✔MIMIC SYMPATHETIC


a drug that stimulates the sympathetic branch of the autonomic nervous system

Epinephrine, adrenaline

Organophosphate poisoning


Cholinergics {see, spit, pee, shit] used in pesticides b/c - 🧠ANSWER ✔✔BUGS

DROWN with Cholinergic [producing fluids: saliva, urine, digestive enzymes]

Organophosphates are used as insecticides, medications, and nerve agents.

Symptoms include increased saliva and tear production, diarrhea, vomiting, small

pupils, sweating, muscle tremors, and confusion.


Cholinergics {see, spit, pee, shit] pathway - 🧠ANSWER ✔✔muscuric and

nicotinic receptors that use acetylcholine neurotransmitters




COPYRIGHT©JOSHCLAY 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE. PRIVACY
2
STATEMENT. ALL RIGHTS RESERVED

, cholinergic cells that use which neurotransmitter - 🧠ANSWER ✔✔Referring to

cells that use acetylcholine as their synaptic transmitter.


SLUDGE-bbb - 🧠ANSWER ✔✔Muscarinic Cholinergic syndrome


Salvation

lacrimination

urination

defecation

gastric emesis

bronchoria

bronchospasm

bradycardia

miosis

increased bowel sounds

Cholinergic Drug toxicity


antidote - 🧠ANSWER ✔✔2-PAM


Atropine



COPYRIGHT©JOSHCLAY 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE. PRIVACY
3
STATEMENT. ALL RIGHTS RESERVED

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