NSAIDs 2: Food producing and performance animals Flashcards

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1
Q

Name 4 indications for NSAIDs

A
  • analgesic
  • anti-inflammatory
  • anti-pyretic
  • anti-thrombotic
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2
Q

2 broad effects of corticosteroids

A
  • genomic (block transcription of inflammatory mediators)

- non-genomic

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3
Q

Name drugs which must NEVER be used in food producing animals in UK?

A
  • Phenybutazone
  • chloramphenicol
  • metronidazole
  • benzyl-penicillin (crystapen)
  • metoclopramide
  • lidocaine
  • gentamicin/ amikacin
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4
Q

Human side effects of phenylbutazone

A
  • fatal blood dyscrasias
  • liver problems
  • no safe determined minimum residue limit
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5
Q

Which species are ‘food producing’

A
  • cattle
  • sheep
  • pigs
  • goats
  • horses
  • chickens
  • fish
  • pot-bellied pigs (even if pets)
  • pygmy goat (even if pets)
  • camelids are a grey area*
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6
Q

How do we use bute in horses?

A

make a note in section A of passport

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7
Q

Why can’t we use phenylbutazone in camelids?

A
  • not legal under EU regulations in food producing animals
  • oral powder not bioavailable in ruminants
  • half life in llamas
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8
Q

Which species have no licensed NSAIDs?

A
  • goats
  • sheep
  • camelids
  • USE CASCADE
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9
Q

Outline the order of the cascade

A
  1. vet med authorised in UK in another spp or for a different condition in same spp
  2. med authorised in UK for human or vet med product not authorised in UK but in a member state (must be in a food producing animal) in accordance with import certificate from VMD
  3. medicine prescribed by vet prepared extemporaneously by vet, pharmacist or person holding manufacturer authorisation
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10
Q

What are the minimum withdrawals for drugs under cascade?

A
  • 7 d (eggs, milk)
  • 28d (meat and poultry)
  • 500 degree days meat from fish
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11
Q

List NSAIDs that are licensed for food animals - 5

A
  • MELOXICAM: cattle, pigs, horses
  • FLUNIXIN: cattle, pigs, horses
  • KETOPROFEN: cattle, pigs, horses
  • CARPROFEN: cattle, horses
  • TOLFENAMIC ACID: cattle, pigs
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12
Q

Outline flunixin meglumine in food animals:

  • species
  • use
  • side effects
A
  • used in sheep/goats with cattle dosage under cascade
  • alpacas under cascade dose for horses
  • USE:
  • visceral and ophthalmic pain
  • systemic inflammation (mastitis, metritis)
  • pain relief after elective surgeries
  • SIDE EFFECTS: decreased cortisol, increased feed intake, increased daily weight gain
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13
Q

Describe meloxicam in food animals

  • spp
  • action
  • uses
A
  • most common NSAID in food animals
  • licensed: cattle, pigs, horses
  • preferential COX-2 inhib
  • prolonged half life (esp. cattle)
  • pain relief after sx
  • now licensed for ‘relief of post-op pain following dehorning calves’
  • effective against: systemic inflammation, visceral and ophthlamic pain, lameness in cattle
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14
Q

Describe ketoprofen in food animals:

  • action
  • use
  • spp
A
  • non-selective COX inhib
  • short half life (limits use, multiple dose = off label)
  • some reduction of bovine lameness
  • some short term effects in toxic mastitic
  • licensed and useful for reducing udder oedema in cattle
  • not as effective as analgesic in elective sz or after LDA sx vs. other NSAIDs
  • cattle, pigs, horses
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15
Q

Describe carprofen in food animals

A
  • non-selective COX inhib in large animals

- prolonged half life in cattle, esp young animals (

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16
Q

Describe tolfenamic acid in food animals

  • use
  • spp
A
  • not commonly used
  • use: BRDC and acute mastitis as anti-inflammatory
  • spp: cattle, pigs
17
Q

Which might affect your choice of NSAID in food animals? 5

A
  • spp licensed
  • cost
  • drug familiarity
  • milk and meat withdrawals
  • ROA
18
Q

3 main adverse effects of NSAIDs in food animals

A
  • abomasal ulcer
  • renal toxicity
  • care with hepatic dz
19
Q

Which NSAIDs are licensed in horses? 8

A
  • meloxicam
  • flunixin
  • phenylbutazone
  • suxibuzone
  • vedaprofen
  • firocoxib
  • carprofen
  • ketoprofen
20
Q

What might affect your choice of NSAID in horses?

A
  • familiarity / clinician preference
  • cost
  • COX 2 selective vs. non-selective
  • ROA
  • intended/ labelled use
21
Q

Describe phenylybutazone in horses

A
  • non-selective COX1/2
  • no evidence of tissue specificity
  • less analgesic effects than flunixin meglumine
22
Q

Describe suxibuzone in horses:

  • what
  • compare with bute
A
  • pro-drug of phenylbutazone
  • given orally
  • more palatable vs. bute
  • more expensive vs. bute
23
Q

Describe flunixin meglumine in horses:

  • action
  • use
A
  • non-selective COX1/2
  • no evidence of tissue specificity
  • good analgesic and effective vs. systemic inflammation
24
Q

Describe meloxicam in horses:

  • action
  • use (2)
  • dose
A
  • COX2 preferential
  • licensed for use in colic, acute/chronic MSK disorders
  • pharmacokinetics show 2x daily dosing would improve efficacy
25
Q

Describe ketoprofen in horses:

- action

A
  • non-selective

- supposed to also inhibit lipoxygenase (no evidence)

26
Q

Describe carprofen in horses

  • action
  • use
A
  • non-selective

- licensed: MSK disorders and sx

27
Q

Describe firocoxib in horses

  • use
  • action
  • side effects
A
  • only licensed COX2 specific inhib in horses
  • long half life (takes 3d to reach steady plasma level and affect lameness levels, takes 7 d to reach peak plasma level)
  • licensed use: OA, reduction in lameness associated pain, achieves high levels in eye
  • seems to have less GIT side effects than other NSAIDs
28
Q

Name 3 main side effects in horses

A
  • GIT
  • renal toxicity
  • phlebitis
29
Q

Outline GIT toxicity in horses d/t NSAIDs

A
  • gastric and oral ulcers (sign of toxicity - dose too high)
  • ulcer of SI and LI mucosa
  • right dorsal colitis (this is a very sensitive area to bute). initially develop hypoalbuminaemia then neutropaenia, diarrhoea, colic. PGE2 and PGI2 are cytoprotective to mucosa
30
Q

Describe renal toxicity in horses d/t NSAIDs

A
  • papillary necrosis

- dehydration, volume depletion –> renal vasoconstriction –> PG synthesis and secondary compensatory vasodilation

31
Q

Describe phlebitis in horses d/t NSAIDs

A

Perivascular injection –> severe phlebitis and tissue necrosis

32
Q

Define detection time

A

approx period of time for which a drug (or its metabolite) can be detected in a horse’s system

33
Q

Define withdrawal time

A

decided by vet, based on detection time and added safety margin. margin should be determined using professional conduct (differences in size, metabolism, degree of fitness, recent illness or disease)