To give ivermectin to chickens, consult a veterinarian for the correct dosage, then administer it orally or through their drinking water as directed.
Ivermectin is a powerful dewormer used by poultry keepers to treat parasites in chickens. While effective, proper dosing and administration are critical for chicken health. This guide covers everything you need to know about using ivermectin for your flock.
What Is Ivermectin and How Does It Work?
Ivermectin is a macrocyclic lactone anthelmintic that paralyzes and kills parasites by disrupting their nervous systems. It’s commonly used off-label for chickens since no poultry-specific formulations exist.
The drug works against:
- Roundworms (Ascaridia galli)
- Threadworms (Capillaria)
- Northern fowl mites
- Scaly leg mites
Types of Ivermectin Products
Three main formulations are available:
| Type | Concentration | Common Brand |
|---|---|---|
| Injectable | 1% (10 mg/ml) | Ivomec |
| Pour-on | 5% (50 mg/ml) | Ivomec Pour-On |
| Oral | 0.08% (0.8 mg/ml) | Ivomec Sheep Drench |
Proper Dosage for Chickens
Dosage varies by formulation and administration method. Never exceed 0.4 mg/kg of body weight.
Pour-On Ivermectin (5%)
For topical application between shoulder blades:
- Bantams: 3 drops
- Standard chickens: 4-5 drops
- Large breeds: 6-7 drops
Use a standard medicine dropper or 20-gauge needle as a dropper. Avoid Ivermectin Plus formulations containing additional wormers unsafe for poultry.
Injectable Ivermectin (1%)
For water administration:
- Mix 1 ml of 1% ivermectin with 1 ml propylene glycol
- Add to 2 gallons of drinking water
- Dose at 1 oz per gallon of water
Treat twice, 10-14 days apart. Withhold eggs for 30 days post-treatment.
Oral Drench
Direct oral dosing:
- 0.2-0.4 mg/kg body weight
- Repeat in 10-14 days if needed
Administration Methods
Topical Application
Apply pour-on formula along the back between shoulders. Part feathers to reach skin. This method treats external parasites and provides systemic protection.
Water Medication
Mix injectable ivermectin in drinking water. Ensure all birds drink treated water within 8 hours. This method works well for large flocks but requires precise calculations.
Direct Oral Dosing
Use a syringe to administer exact doses. Helpful for young chickens or small flocks where water consumption monitoring is difficult.
Safety Considerations
Ivermectin has a wide safety margin but precautions are essential:
- Never use in laying hens producing eggs for human consumption
- Avoid use in sick or weak birds
- Watch for interactions with other medications
- Store at 68-77°F (20-25°C) protected from light
According to PoultryDVM, dosages over 5 mg/kg are toxic. The Backyard Chickens community reports successful use at recommended doses with minimal side effects.
Egg Withdrawal Period
While no official withdrawal period exists for poultry, experts recommend:
- 7-14 day withdrawal for meat birds
- 30 day withdrawal for eggs
When to Treat Your Flock
Consider ivermectin treatment when you observe:
- Visible mites or lice
- Weight loss despite good appetite
- Pale combs and wattles
- Diarrhea or abnormal droppings
- Decreased egg production
Regular deworming every 3-6 months helps prevent parasite problems. Rotate with other dewormers like fenbendazole to prevent resistance.
Alternative Parasite Control Methods
For those hesitant to use ivermectin:
- Diatomaceous earth in dust baths
- Garlic in drinking water
- Essential oil sprays (eucalyptus, tea tree)
- Frequent coop cleaning and rotation
Always consult an avian veterinarian before treating your flock, especially if birds show severe symptoms or you’re unsure about proper dosing.