Penn Foster Veterinary Pharmacology Final
Review Edition — Updated Comprehensive
Study Guide
2026 Penn Foster Veterinary Pharmacology Final Review
Updated Comprehensive Study Guide
Section 1: Pharmacology Fundamentals & Drug Regulations
1. What is the study of how a drug moves through the body (absorption, distribution,
metabolism, excretion)?
Answer: Pharmacokinetics
2. What is the study of the biochemical and physiologic effects of drugs and their
mechanisms of action?
Answer: Pharmacodynamics
3. What term describes the amount of an administered drug that reaches the systemic
circulation?
Answer: Bioavailability
4. The time it takes for the plasma concentration of a drug to reduce by 50% is known as
what?
Answer: Half-life (t½)
5. Which federal agency is responsible for approving animal drugs and medicated feeds
in the United States?
Answer: The FDA's Center for Veterinary Medicine (CVM)
6. What does the acronym "AMDUCA" stand for, and what is its primary purpose?
Answer: Animal Medicinal Drug Use Clarification Act. It allows veterinarians to prescribe
extra-label use of drugs under certain conditions.
7. What is the term for a drug that requires a prescription because it can only be used
safely under a veterinarian's supervision?
Answer: Legend Drug (or prescription drug)
, 8. Which schedule of controlled substances has the highest potential for abuse and no
accepted medical use (e.g., heroin)?
Answer: Schedule I
9. What is the primary concern with the use of compounded drugs?
Answer: They are not FDA-approved, so their safety, efficacy, stability, and potency are
not guaranteed.
10. What is the "Withdrawal Time" for a food animal medication?
Answer: The time from last drug administration until the animal's tissues (meat, milk,
eggs) are safe for human consumption, with drug residues below the tolerance level.
Section 2: Antimicrobials
11. Which class of antibiotics works by inhibiting bacterial cell wall synthesis and includes
drugs like penicillin and amoxicillin?
Answer: Penicillins (Beta-lactams)
12. What is the term for antibiotics that are effective against a wide range of both Gram-
positive and Gram-negative bacteria?
Answer: Broad-spectrum antibiotics
13. Why are aminoglycoside antibiotics (e.g., gentamicin) typically used with caution?
Answer: They can cause nephrotoxicity (kidney damage) and ototoxicity (ear/balance
damage).
14. Which class of antibiotics is commonly associated with causing cartilage abnormalities
in young, growing animals?
Answer: Fluoroquinolones (e.g., enrofloxacin)
15. What is a common, serious adverse effect of oral clindamycin or lincomycin in
herbivores like rabbits and horses?
Answer: Fatal disruption of GI flora, leading to enterotoxemia or diarrhea.
16. What is the mechanism of action of sulfonamides?
Answer: They inhibit folic acid synthesis in bacteria by competing with PABA (para-
aminobenzoic acid).
17. Which antibiotic, often used topically for ear and eye infections, is in the class
aminocyclitols and is related to aminoglycosides?
Answer: Apramycin (or Spectinomycin)
, 18. What is the primary use of metronidazole in veterinary medicine?
Answer: Treatment of anaerobic bacterial infections and certain protozoal infections
(e.g., Giardia).
19. What term describes when two antibiotics work better together than they would
individually (e.g., penicillin and aminoglycoside for serious infections)?
Answer: Synergism
20. What is the major concern with the overuse or inappropriate use of antibiotics?
Answer: Development of antimicrobial resistance.
Section 3: Antiparasitics
21. Which class of heartworm preventives also controls intestinal parasites by causing
paralysis in nematodes?
Answer: Macrocyclic Lactones (e.g., ivermectin, selamectin, moxidectin)
22. Why is ivermectin toxic in some dog breeds like Collies?
Answer: Due to a mutation in the MDR1 gene, which allows the drug to cross the blood-
brain barrier and cause neurotoxicity.
23. What is the primary mechanism of action of pyrantel pamoate?
Answer: It is a depolarizing neuromuscular blocking agent, causing paralysis of parasites
(nicotinic agonist).
24. Which topical parasiticide is commonly used for fleas and ticks and works as a
neonicotinoid insecticide?
Answer: Imidacloprid
25. What class of drugs includes fipronil, and how does it work?
Answer: Phenylpyrazoles. It works by blocking GABA-gated chloride channels in insects,
leading to hyperexcitation and death.
26. Which drug is the treatment of choice for Babesia canis infections (canine
piroplasmosis)?
Answer: Imidocarb dipropionate
27. What is the primary use of praziquantel?
Answer: Treatment of cestode (tapeworm) and trematode (fluke) infections.
28. Which drug class, effective against fleas, ticks, and mites, works on insect octopamine
receptors?
Answer: Amitraz (formamidines)
, 29. What is a common, serious side effect of using amitraz dips incorrectly?
Answer: Sedation, bradycardia, hypothermia, and hyperglycemia (especially in small
dogs).
30. What is the goal of using a "flea lifecycle" approach with insecticides and insect
growth regulators (IGRs)?
Answer: To break the flea life cycle by killing adults and preventing eggs/larvae from
developing.
Section 4: Anesthetics, Analgesics, and Sedatives
31. What schedule drug is the opioid analgesic morphine?
Answer: Schedule II
32. Which drug is a common reversible alpha-2 agonist sedative/analgesic?
Answer: Dexmedetomidine
33. What is the specific reversal agent for benzodiazepines like midazolam?
Answer: Flumazenil
34. What is the specific reversal agent for opioid agonists like morphine?
Answer: Naloxone
35. Which class of NSAIDs is "cox-1 sparing" and includes drugs like deracoxib and
firocoxib?
Answer: COX-2 selective inhibitors (Coxibs)
36. What is the most significant potential side effect of all NSAIDs?
Answer: Gastrointestinal ulceration.
37. Why should you never combine corticosteroid and NSAID therapy?
Answer: It drastically increases the risk of severe gastrointestinal ulceration and
perforation.
38. What injectable dissociative anesthetic is commonly used in cats and is known for
causing catalepsy?
Answer: Ketamine
39. What is the primary advantage of using propofol as an induction agent?
Answer: Rapid, smooth induction and recovery, with minimal post-anesthetic
excitement.
Review Edition — Updated Comprehensive
Study Guide
2026 Penn Foster Veterinary Pharmacology Final Review
Updated Comprehensive Study Guide
Section 1: Pharmacology Fundamentals & Drug Regulations
1. What is the study of how a drug moves through the body (absorption, distribution,
metabolism, excretion)?
Answer: Pharmacokinetics
2. What is the study of the biochemical and physiologic effects of drugs and their
mechanisms of action?
Answer: Pharmacodynamics
3. What term describes the amount of an administered drug that reaches the systemic
circulation?
Answer: Bioavailability
4. The time it takes for the plasma concentration of a drug to reduce by 50% is known as
what?
Answer: Half-life (t½)
5. Which federal agency is responsible for approving animal drugs and medicated feeds
in the United States?
Answer: The FDA's Center for Veterinary Medicine (CVM)
6. What does the acronym "AMDUCA" stand for, and what is its primary purpose?
Answer: Animal Medicinal Drug Use Clarification Act. It allows veterinarians to prescribe
extra-label use of drugs under certain conditions.
7. What is the term for a drug that requires a prescription because it can only be used
safely under a veterinarian's supervision?
Answer: Legend Drug (or prescription drug)
, 8. Which schedule of controlled substances has the highest potential for abuse and no
accepted medical use (e.g., heroin)?
Answer: Schedule I
9. What is the primary concern with the use of compounded drugs?
Answer: They are not FDA-approved, so their safety, efficacy, stability, and potency are
not guaranteed.
10. What is the "Withdrawal Time" for a food animal medication?
Answer: The time from last drug administration until the animal's tissues (meat, milk,
eggs) are safe for human consumption, with drug residues below the tolerance level.
Section 2: Antimicrobials
11. Which class of antibiotics works by inhibiting bacterial cell wall synthesis and includes
drugs like penicillin and amoxicillin?
Answer: Penicillins (Beta-lactams)
12. What is the term for antibiotics that are effective against a wide range of both Gram-
positive and Gram-negative bacteria?
Answer: Broad-spectrum antibiotics
13. Why are aminoglycoside antibiotics (e.g., gentamicin) typically used with caution?
Answer: They can cause nephrotoxicity (kidney damage) and ototoxicity (ear/balance
damage).
14. Which class of antibiotics is commonly associated with causing cartilage abnormalities
in young, growing animals?
Answer: Fluoroquinolones (e.g., enrofloxacin)
15. What is a common, serious adverse effect of oral clindamycin or lincomycin in
herbivores like rabbits and horses?
Answer: Fatal disruption of GI flora, leading to enterotoxemia or diarrhea.
16. What is the mechanism of action of sulfonamides?
Answer: They inhibit folic acid synthesis in bacteria by competing with PABA (para-
aminobenzoic acid).
17. Which antibiotic, often used topically for ear and eye infections, is in the class
aminocyclitols and is related to aminoglycosides?
Answer: Apramycin (or Spectinomycin)
, 18. What is the primary use of metronidazole in veterinary medicine?
Answer: Treatment of anaerobic bacterial infections and certain protozoal infections
(e.g., Giardia).
19. What term describes when two antibiotics work better together than they would
individually (e.g., penicillin and aminoglycoside for serious infections)?
Answer: Synergism
20. What is the major concern with the overuse or inappropriate use of antibiotics?
Answer: Development of antimicrobial resistance.
Section 3: Antiparasitics
21. Which class of heartworm preventives also controls intestinal parasites by causing
paralysis in nematodes?
Answer: Macrocyclic Lactones (e.g., ivermectin, selamectin, moxidectin)
22. Why is ivermectin toxic in some dog breeds like Collies?
Answer: Due to a mutation in the MDR1 gene, which allows the drug to cross the blood-
brain barrier and cause neurotoxicity.
23. What is the primary mechanism of action of pyrantel pamoate?
Answer: It is a depolarizing neuromuscular blocking agent, causing paralysis of parasites
(nicotinic agonist).
24. Which topical parasiticide is commonly used for fleas and ticks and works as a
neonicotinoid insecticide?
Answer: Imidacloprid
25. What class of drugs includes fipronil, and how does it work?
Answer: Phenylpyrazoles. It works by blocking GABA-gated chloride channels in insects,
leading to hyperexcitation and death.
26. Which drug is the treatment of choice for Babesia canis infections (canine
piroplasmosis)?
Answer: Imidocarb dipropionate
27. What is the primary use of praziquantel?
Answer: Treatment of cestode (tapeworm) and trematode (fluke) infections.
28. Which drug class, effective against fleas, ticks, and mites, works on insect octopamine
receptors?
Answer: Amitraz (formamidines)
, 29. What is a common, serious side effect of using amitraz dips incorrectly?
Answer: Sedation, bradycardia, hypothermia, and hyperglycemia (especially in small
dogs).
30. What is the goal of using a "flea lifecycle" approach with insecticides and insect
growth regulators (IGRs)?
Answer: To break the flea life cycle by killing adults and preventing eggs/larvae from
developing.
Section 4: Anesthetics, Analgesics, and Sedatives
31. What schedule drug is the opioid analgesic morphine?
Answer: Schedule II
32. Which drug is a common reversible alpha-2 agonist sedative/analgesic?
Answer: Dexmedetomidine
33. What is the specific reversal agent for benzodiazepines like midazolam?
Answer: Flumazenil
34. What is the specific reversal agent for opioid agonists like morphine?
Answer: Naloxone
35. Which class of NSAIDs is "cox-1 sparing" and includes drugs like deracoxib and
firocoxib?
Answer: COX-2 selective inhibitors (Coxibs)
36. What is the most significant potential side effect of all NSAIDs?
Answer: Gastrointestinal ulceration.
37. Why should you never combine corticosteroid and NSAID therapy?
Answer: It drastically increases the risk of severe gastrointestinal ulceration and
perforation.
38. What injectable dissociative anesthetic is commonly used in cats and is known for
causing catalepsy?
Answer: Ketamine
39. What is the primary advantage of using propofol as an induction agent?
Answer: Rapid, smooth induction and recovery, with minimal post-anesthetic
excitement.
