ELANCO VETERINARY MEDICAL
APPLICATIONS CERTIFICATION REVIEW
EXAM 2026 | PRACTICE QUESTIONS &
VERIFIED CORRECT ANSWERS WITH
DETAILED RATIONALES | COMPLETE STUDY
GUIDE
• This 127-question practice exam covers the complete Elanco Veterinary Medical
Applications Certification content — including pharmacology, parasitology, food
animal medicine, antimicrobials, regulatory compliance, and companion animal
therapeutics — with every question featuring five answer options, a highlighted
correct answer, and a detailed RATIONALE.
• Study this material by attempting each question on your own before reviewing
the correct answer and RATIONALE; revisit any question you missed and use the
RATIONALE to reinforce your clinical reasoning and understanding of Elanco's
veterinary product portfolio.
───────────────────────────────────────────────────────
──
ELANCO VETERINARY MEDICAL APPLICATIONS CERTIFICATION REVIEW EXAM 2026
PRACTICE QUESTIONS & VERIFIED CORRECT ANSWERS WITH DETAILED RATIONALE
| COMPLETE STUDY GUIDE
───────────────────────────────────────────────────────
──
SECTION 1: PARASITOLOGY & ANTIPARASITIC PRODUCTS
───────────────────────────────────────────────────────
──
Q1. What is the mechanism of action of milbemycin oxime, the active
ingredient in Interceptor® and Interceptor Plus®?
A. Inhibition of acetylcholinesterase, causing spastic paralysis
B. Inhibition of chitin synthesis, preventing larval molting
C. Opening of glutamate-gated chloride channels, causing flaccid paralysis and
death in parasites
,D. Disruption of the parasite's mitochondrial electron transport chain
E. Competitive inhibition of GABA receptors in the parasite's nervous system
Correct Answer: C. Opening of glutamate-gated chloride channels, causing
flaccid paralysis and death in parasites
RATIONALE: Milbemycin oxime is a macrocyclic lactone that binds to glutamate-
gated chloride channels in invertebrate nerve and muscle cells, causing increased
permeability to chloride ions, hyperpolarization, and flaccid paralysis of the
parasite. Mammals are unaffected at therapeutic doses because these channels are
absent in mammals and the drug has limited CNS penetration in healthy animals.
───────────────────────────────────────────────────────
──
Q2. Trifexis® (spinosad + milbemycin oxime) is indicated for which
combination of uses in dogs?
A. Prevention of heartworm disease, flea control, and tick prevention
B. Prevention of heartworm disease, flea control, and treatment of hookworms,
roundworms, and whipworms
C. Treatment of established heartworm infection, flea control, and tapeworm
prevention
D. Flea control, tick control, and prevention of Lyme disease
E. Heartworm prevention, ear mite treatment, and roundworm control
Correct Answer: B. Prevention of heartworm disease, flea control, and
treatment of hookworms, roundworms, and whipworms
RATIONALE: Trifexis is a combination oral tablet approved for dogs only.
Spinosad kills adult fleas, while milbemycin oxime prevents heartworm disease
(Dirofilaria immitis) and controls adult hookworms (Ancylostoma caninum),
roundworms (Toxocara canis, Toxascaris leonina), and whipworms (Trichuris
vulpis). It does not provide tick control or treat tapeworms.
───────────────────────────────────────────────────────
──
,Q3. Credelio® (lotilaner) belongs to which drug class and works by what
mechanism?
A. Macrocyclic lactone; opens glutamate-gated chloride channels
B. Neonicotinoid; activates nicotinic acetylcholine receptors
C. Isoxazoline; blocks GABA-gated and glutamate-gated chloride channels in insects
and acarines
D. Organophosphate; inhibits acetylcholinesterase
E. Phenylpyrazole; inhibits GABA-gated chloride channels selectively
Correct Answer: C. Isoxazoline; blocks GABA-gated and glutamate-gated
chloride channels in insects and acarines
RATIONALE: Lotilaner (Credelio) is an isoxazoline compound that blocks GABA-
gated and glutamate-gated chloride channels in arthropod nerve cells, resulting in
uncontrolled neuronal activity, paralysis, and death of fleas and ticks. Its high
selectivity for invertebrate receptors over mammalian receptors provides a
favorable safety profile in dogs and cats at labeled doses.
───────────────────────────────────────────────────────
──
Q4. Which of the following best describes the intestinal parasites controlled
by Interceptor Plus® (milbemycin oxime + praziquantel) in dogs?
A. Hookworms, roundworms, whipworms, and tapeworms
B. Roundworms, tapeworms, and Giardia
C. Hookworms, whipworms, and Giardia only
D. Tapeworms and roundworms only
E. All gastrointestinal helminths including flukes
Correct Answer: A. Hookworms, roundworms, whipworms, and tapeworms
RATIONALE: Interceptor Plus combines milbemycin oxime (controlling
hookworms, roundworms, and whipworms) with praziquantel (controlling
, tapeworms including Taenia pisiformis, Echinococcus multilocularis, E. granulosus,
and Dipylidium caninum), alongside heartworm prevention. It does not control
Giardia or trematodes.
───────────────────────────────────────────────────────
──
Q5. Spinosad, the flea-killing component of Trifexis®, works through which
mechanism?
A. Inhibiting acetylcholinesterase at the neuromuscular junction
B. Blocking sodium channels causing neuronal hyperexcitability
C. Activating nicotinic acetylcholine receptors and disrupting GABA receptor
function in insects
D. Opening glutamate-gated chloride channels causing flaccid paralysis
E. Inhibiting chitin synthesis and preventing larval molting
Correct Answer: C. Activating nicotinic acetylcholine receptors and
disrupting GABA receptor function in insects
RATIONALE: Spinosad is a natural fermentation product of Saccharopolyspora
spinosa. It acts primarily by activating nicotinic acetylcholine receptors and
secondarily by disrupting GABA receptor function in insects, causing nervous
system excitation, paralysis, and death of fleas. Its selectivity for insect receptor
subtypes accounts for its safety in mammals at therapeutic doses.
───────────────────────────────────────────────────────
──
Q6. At what minimum age and weight can Credelio® be administered to dogs?
A. 4 weeks of age and 2 lbs
B. 6 weeks of age and 3 lbs
C. 8 weeks of age and weighing at least 4.4 lbs (2 kg)
D. 12 weeks of age and at least 5 lbs
E. 16 weeks of age and at least 10 lbs
APPLICATIONS CERTIFICATION REVIEW
EXAM 2026 | PRACTICE QUESTIONS &
VERIFIED CORRECT ANSWERS WITH
DETAILED RATIONALES | COMPLETE STUDY
GUIDE
• This 127-question practice exam covers the complete Elanco Veterinary Medical
Applications Certification content — including pharmacology, parasitology, food
animal medicine, antimicrobials, regulatory compliance, and companion animal
therapeutics — with every question featuring five answer options, a highlighted
correct answer, and a detailed RATIONALE.
• Study this material by attempting each question on your own before reviewing
the correct answer and RATIONALE; revisit any question you missed and use the
RATIONALE to reinforce your clinical reasoning and understanding of Elanco's
veterinary product portfolio.
───────────────────────────────────────────────────────
──
ELANCO VETERINARY MEDICAL APPLICATIONS CERTIFICATION REVIEW EXAM 2026
PRACTICE QUESTIONS & VERIFIED CORRECT ANSWERS WITH DETAILED RATIONALE
| COMPLETE STUDY GUIDE
───────────────────────────────────────────────────────
──
SECTION 1: PARASITOLOGY & ANTIPARASITIC PRODUCTS
───────────────────────────────────────────────────────
──
Q1. What is the mechanism of action of milbemycin oxime, the active
ingredient in Interceptor® and Interceptor Plus®?
A. Inhibition of acetylcholinesterase, causing spastic paralysis
B. Inhibition of chitin synthesis, preventing larval molting
C. Opening of glutamate-gated chloride channels, causing flaccid paralysis and
death in parasites
,D. Disruption of the parasite's mitochondrial electron transport chain
E. Competitive inhibition of GABA receptors in the parasite's nervous system
Correct Answer: C. Opening of glutamate-gated chloride channels, causing
flaccid paralysis and death in parasites
RATIONALE: Milbemycin oxime is a macrocyclic lactone that binds to glutamate-
gated chloride channels in invertebrate nerve and muscle cells, causing increased
permeability to chloride ions, hyperpolarization, and flaccid paralysis of the
parasite. Mammals are unaffected at therapeutic doses because these channels are
absent in mammals and the drug has limited CNS penetration in healthy animals.
───────────────────────────────────────────────────────
──
Q2. Trifexis® (spinosad + milbemycin oxime) is indicated for which
combination of uses in dogs?
A. Prevention of heartworm disease, flea control, and tick prevention
B. Prevention of heartworm disease, flea control, and treatment of hookworms,
roundworms, and whipworms
C. Treatment of established heartworm infection, flea control, and tapeworm
prevention
D. Flea control, tick control, and prevention of Lyme disease
E. Heartworm prevention, ear mite treatment, and roundworm control
Correct Answer: B. Prevention of heartworm disease, flea control, and
treatment of hookworms, roundworms, and whipworms
RATIONALE: Trifexis is a combination oral tablet approved for dogs only.
Spinosad kills adult fleas, while milbemycin oxime prevents heartworm disease
(Dirofilaria immitis) and controls adult hookworms (Ancylostoma caninum),
roundworms (Toxocara canis, Toxascaris leonina), and whipworms (Trichuris
vulpis). It does not provide tick control or treat tapeworms.
───────────────────────────────────────────────────────
──
,Q3. Credelio® (lotilaner) belongs to which drug class and works by what
mechanism?
A. Macrocyclic lactone; opens glutamate-gated chloride channels
B. Neonicotinoid; activates nicotinic acetylcholine receptors
C. Isoxazoline; blocks GABA-gated and glutamate-gated chloride channels in insects
and acarines
D. Organophosphate; inhibits acetylcholinesterase
E. Phenylpyrazole; inhibits GABA-gated chloride channels selectively
Correct Answer: C. Isoxazoline; blocks GABA-gated and glutamate-gated
chloride channels in insects and acarines
RATIONALE: Lotilaner (Credelio) is an isoxazoline compound that blocks GABA-
gated and glutamate-gated chloride channels in arthropod nerve cells, resulting in
uncontrolled neuronal activity, paralysis, and death of fleas and ticks. Its high
selectivity for invertebrate receptors over mammalian receptors provides a
favorable safety profile in dogs and cats at labeled doses.
───────────────────────────────────────────────────────
──
Q4. Which of the following best describes the intestinal parasites controlled
by Interceptor Plus® (milbemycin oxime + praziquantel) in dogs?
A. Hookworms, roundworms, whipworms, and tapeworms
B. Roundworms, tapeworms, and Giardia
C. Hookworms, whipworms, and Giardia only
D. Tapeworms and roundworms only
E. All gastrointestinal helminths including flukes
Correct Answer: A. Hookworms, roundworms, whipworms, and tapeworms
RATIONALE: Interceptor Plus combines milbemycin oxime (controlling
hookworms, roundworms, and whipworms) with praziquantel (controlling
, tapeworms including Taenia pisiformis, Echinococcus multilocularis, E. granulosus,
and Dipylidium caninum), alongside heartworm prevention. It does not control
Giardia or trematodes.
───────────────────────────────────────────────────────
──
Q5. Spinosad, the flea-killing component of Trifexis®, works through which
mechanism?
A. Inhibiting acetylcholinesterase at the neuromuscular junction
B. Blocking sodium channels causing neuronal hyperexcitability
C. Activating nicotinic acetylcholine receptors and disrupting GABA receptor
function in insects
D. Opening glutamate-gated chloride channels causing flaccid paralysis
E. Inhibiting chitin synthesis and preventing larval molting
Correct Answer: C. Activating nicotinic acetylcholine receptors and
disrupting GABA receptor function in insects
RATIONALE: Spinosad is a natural fermentation product of Saccharopolyspora
spinosa. It acts primarily by activating nicotinic acetylcholine receptors and
secondarily by disrupting GABA receptor function in insects, causing nervous
system excitation, paralysis, and death of fleas. Its selectivity for insect receptor
subtypes accounts for its safety in mammals at therapeutic doses.
───────────────────────────────────────────────────────
──
Q6. At what minimum age and weight can Credelio® be administered to dogs?
A. 4 weeks of age and 2 lbs
B. 6 weeks of age and 3 lbs
C. 8 weeks of age and weighing at least 4.4 lbs (2 kg)
D. 12 weeks of age and at least 5 lbs
E. 16 weeks of age and at least 10 lbs
