Veterinary Pharmacology Flashcards

Which drug class is commonly used to treat hyperthyroidism in cats by blocking thyroid hormone synthesis?

Answer: Thiamazole (methimazole)

Methimazole (brand name Tapazole or Felimazole) inhibits thyroid peroxidase, reducing synthesis of T3 and T4 in hyperthyroid cats.

A dog is prescribed phenobarbital for seizure control. Which organ's function must be monitored regularly due to long-term use?

Answer: Liver

Phenobarbital is hepatically metabolized and can cause hepatotoxicity with chronic use, requiring regular liver enzyme monitoring.

What is the primary mechanism of action of omeprazole in veterinary patients?

Answer: Proton pump inhibitor

Omeprazole irreversibly inhibits the H+/K+ ATPase (proton pump) in gastric parietal cells, reducing acid secretion.

Which controlled substance schedule classification applies to ketamine in the United States?

Answer: Schedule III

Ketamine is classified as a Schedule III controlled substance under the DEA, requiring proper record-keeping and secure storage.

A cat receives acepromazine as a pre-anesthetic. Which side effect should the veterinary assistant monitor for?

Answer: Hypotension

Acepromazine causes vasodilation via alpha-1 adrenergic blockade, leading to hypotension, which is especially concerning in compromised patients.

Which antiparasitic drug works by enhancing GABA-mediated neurotransmission in parasites, causing paralysis?

Answer: Ivermectin

Ivermectin potentiates GABA at nerve and muscle junctions in invertebrates, causing paralysis and death of susceptible parasites.

When dispensing liquid medications, which tool provides the most accurate measurement for small volumes under 1 mL?

Answer: Oral dosing syringe

Calibrated oral dosing syringes provide the most accurate measurement for small volumes and reduce dosing errors in veterinary patients.