Parasiticides Flashcards
Endoparasite
Internal parasite
- round worm
- tape worm
- lung worm
Ectoparasite
External parasite
- fleas
- ticks
- lice
- mites
Endoparasiticide
Acts on internal parasites
Ectoparasiticide
Acts on external parasites
Endeparasiticide
Acts on internal and external parasites
Acarids
Arachnids - ticks - mites 4 pairs of legs 2 body sections
Acaricidal
Kills acarids
Insect
-Fleas
-Lice
3 pairs of legs
3 body parts
Insectacidal
Kills insects
- fleas
- lice
Ectoparasiticides kill by
— CNS activity - causing paralysis and death
— influencing and inhibiting growth and development
Anthelmentics
— HELMINTHS —
To kill or expell worms
Antiprotozoal
— PROTOZOA —
Drugs that act against protozoa
Nematocides
— NEMATODES —
to kill or expell nematodes (round worms)
Cestocides
— CESTODES —
To kill or expell cestodes (tape worm)
Trematocides
Drugs that act against Flukes (parasitic flat worms)
ORGANOPHOSPHATES
Stays in the coat for a long time
Acts systematically if medication give orally, but levels only persist for 24 hours
eg. - diazinon
- dichlofenthion
- malathion
ORGANOCHLORIDES
Long duration of action
Toxiticity can occur - presents as CNS stimulation
eg. - DDT
- lindane
CARBAMATES
Stays in the coat for a long time
Acts systematically if medication give orally, but levels only persist for 24 hours
Similar to organophosphates
HOW DO ORGANOPHOSPHATES and CARBAMATES WORK?
Block the action of acetylcholinesterase (stimulate the parasympathetic nervous system)
HOW DO ORGANOCHLORIDES WORK?
general Centra nervous system stimulatants
SIDE EFFECTS AND CONTRAINDICATIONS OF ORGANOPHOSPHATES, CARBAMATES and ORGANOCHLORIDES
- salivation
- lacrimation
- urinination
- dyspnoea due to broncho constriction and increased respitory secretions
- GIT; increased motility - defecation
- Emesis - vomiting
- Bradycardia
- Miosis - Mydrasis
Muscle tremours, shaking, ataxia, paralysis
TREATMENT FOR INTOXICATION OF ORGANOPHOSPHATES, CARBAMATES and ORGANOCHLORIDES
remove the insecticide and block the parasympathetic nervous effects of the drug.
Atropine can help with ORGANOPHOSPHATES and CARBAMATE toxicity
WHY ARE ORGANOPHOSPHATES, CARBAMATES and ORGANOCHLORIDES DECLINING IN POPULARITY
- -Resistance
- -Side effects
- -Toxicity
- -Toxic to environment and animals
Pyrethin
– found in shamppos, collars and sprays
- pyrethrin is made from extracts of chrsanthemum flowers
- pyrethroid - synthetic version
– synthetic pyrethroids have a good repellent effects
– neurotoxins
Lipophilic, act as contact insecticides
– High margin on saftey
Pyrethin - how does it work?
Causes extending firing of nerves and muscluar spasm
rapid spasm will then cause paralysis and death of parasites
Pyrethin - uses?
flea and tick infestations
Pyrethin - side effects and contraindicatins
PERMETHRIN can be toxic to cats if a dog preperation is used PYRETHROIDS are toxic to cats Fish can absorb through their skin and will be fatal Signs of toxicity include: - salivation - vomiting - tremors - seizures
AMITRAZ
Diamide insectacide
- first effective agent afainst demodectic mange in dogs
eg - aludex
AMITRAZ - action
Increased nervous activity
AMITRAZ - uses
Treatment of demodectic mange
treatment of sarcoptic mange
effective against ticks
AMITRAZ - side effects and contraindications
- wear gloves when handling
- CNS depression
- poor thermoregulation
- NOT TO BE USED IN CATS
- Pruritus after treatment (foreign body reaction to dead mites)
- toxic if ingested
- Atipamexole can be used to reverse sedative side effects of toxicity
Phenylpyrazole - fipronil
Synthetic molecule
potent insecticidal and acaricidal properties
FRONTLINE