TestUstad

Free Toxicology MCQs with Answers

11 Toxicology MCQs from Pharmacology, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.

Last updated

11 questions

1. Best and most effective drug to control convulsions in toxicity cases is______________?

  • A. Phenobarbitone
  • B. Phenytoin
  • C. Diazepam
  • D. Carbemezipine

Explanation: Intravenous diazepam is commonly used to rapidly control convulsions caused by poisoning, including many drug toxicities.

Read the full explanation →
Correct answer: Diazepam

2. The most prominent toxic effect associated with acetominophen use is______________?

  • A. Respiratory alkalosis
  • B. Haemorrhage
  • C. Hepatic necrosis
  • D. Gastric Ulceration

Explanation: The major dose-related toxicity of acetaminophen overdose is hepatic necrosis caused by accumulation of the toxic metabolite NAPQI when…

Read the full explanation →
Correct answer: Hepatic necrosis

3. Drugs like barbiturates precipitate symptoms of prophyria because______________?

  • A. They depress ALA synthase
  • B. They inhibit ALA synthase
  • C. They induce heme oxygenase
  • D. They inhibit heme oxygenase

Explanation: Barbiturates induce hepatic ALA synthase, increasing porphyrin precursor production and potentially precipitating acute porphyria.

Read the full explanation →
Correct answer: They depress ALA synthase

4. Acute Barbiturate poisoning results in_______________?

  • A. Renal failure
  • B. Liver failure
  • C. Respiratory failure
  • D. Convulsions

Explanation: Acute barbiturate poisoning produces profound central nervous system depression, with respiratory depression and failure being the major…

Read the full explanation →
Correct answer: Respiratory failure

5. One of the obious consequences of alchol ( ethenol), ingestion in many individual is facial flushing and increased heart rate triggered off by alcohol getting metabolized to______________?

  • A. Formaldehyde
  • B. Acetaldehyde
  • C. Propanaldehyde
  • D. Butanaldehyde

Explanation: Ethanol is first oxidised to acetaldehyde, a reactive metabolite that can cause facial flushing, tachycardia and headache, especially in…

Read the full explanation →
Correct answer: Acetaldehyde

6. Salicylate overdose in children causes_______________?

  • A. Crystalluria
  • B. Rye's syndrome
  • C. Kernicterus
  • D. None of the above

Explanation: Aspirin or salicylate exposure in children, particularly during a viral illness, is associated with Reye syndrome, involving acute…

Read the full explanation →
Correct answer: Rye's syndrome

7. A child is brought with drowsiness, decreased deep tendon reflexes and seizures. On examination the child has a blue line on gums. There is history of constipation. Which will be most appropriate drug that should be used in this child ?

  • A. EDTA
  • B. DMSA
  • C. BAL
  • D. Penicillamine

Explanation: The blue gingival line, constipation, reduced reflexes, drowsiness, and seizures indicate severe lead poisoning with encephalopathy.

Read the full explanation →
Correct answer: EDTA

8. For Arsenic poisoning Antidote is_____________?

  • A. Penicillamine
  • B. E.D.T.A
  • C. Desferrixamine
  • D. B.A.L

Explanation: Dimercaprol, also called British anti-Lewisite or BAL, chelates arsenic and is the classic antidote for significant arsenic poisoning.

Read the full explanation →
Correct answer: B.A.L

9. Heroin, an addict drug contains______________?

  • A. ASA
  • B. Acetyl morphine
  • C. Pentazocine
  • D. Propoxyphene

Explanation: Heroin is diacetylmorphine, formed by acetylating morphine at two hydroxyl groups.

Read the full explanation →
Correct answer: Acetyl morphine

10. Desfuroxamide is a drug used for____________?

  • A. Kala azar
  • B. Pernicious anaemia
  • C. Pain control
  • D. Thalassemia

Explanation: Desferrioxamine is an iron-chelating agent used chronically to remove excess iron in thalassemia and acutely in iron poisoning.

Read the full explanation →
Correct answer: Thalassemia

11. A patient is having bronchodilation, increased temperature, constipation and tachycardia. The tentative diagnosis is_______________?

  • A. Oraganophosphate poisoning
  • B. Paracetamol poisoning
  • C. Mushroom poisoning
  • D. Atropine poisoning

Explanation: Bronchodilation, fever, tachycardia, constipation and other antimuscarinic effects form the classic atropine poisoning syndrome, often…

Read the full explanation →
Correct answer: Atropine poisoning
Start Free Toxicology Practice MCQs Test

Toxicology MCQs: common questions

Are these Toxicology MCQs free?

Yes. All Toxicology MCQs from Pharmacology are free on TestUstad, with unlimited attempts and no account needed. Nothing on this page is a sample or a trial.

How many Toxicology MCQs are on this page?

There are 11 Toxicology MCQs in the Pharmacology bank, shown 20 to a page with the correct answer and an explanation on each.

Does every Toxicology MCQ have an explanation?

Yes. Each Toxicology question shows the correct option and a written explanation of why it is correct, so a wrong answer teaches you something rather than just being marked wrong.

Can I take a timed Toxicology test?

Yes. The practice button on this page starts a free Toxicology test drawn from the Pharmacology bank. It marks each answer instantly, gives you a score at the end, and can be retaken as many times as you like.