I created this page because I was getting confused from all the different worming advice I have been reading on the board. It's just for reference. I've included links where I've found this stuff.
The only approved wormer in this country for poultry is wazine.https://www.backyardchickens.com/forum/viewtopic.php?id=423896&p=2 Use the others with common sense as they are made for other livestock and use at own risk.
When worming, you'll want to repeat treatment 2 weeks after the first time. Also, you'll want to vary your treatment. If you see worms, start with Wazine17 first and follow with a different wormer.
Wazine17 (piperazine)paralyzes roundworms and they get expelled from the hen. Withdrawal is 14 days. Dosage:two ounces in two gallons of water for one day-https://www.backyardchickens.com/forum/viewtopic.php?id=401475. Found this at my local feedstore.
Dosages for Ivermectin cattle pour on should be put on bare skin on the back of their necks between their shoulders. Use a syringe with a 20-25 gauge needle....not for injection, but for measurement. Dont get any on their feathers, it's not known what the effects will be....bare skin only as it is quickly absorbed into the skin. For small chickens such as bantams, leghorns, hamburgs, seabrights....3 drops. Medium size such as EE's, sex links....4 drops. Large chickens such as barred rocks, rir's, buff orpingtons, black australorp's....5 drops. For extra large chickens such as jersey giants, big roosters,etc.....6 drops to the back of the neck. It's best to wear plastic gloves and normally a 2 person task. Discard eggs for 2 weeks. The pour on will also take care of most lice/mite problems. Edited: Ivermectin kills most worms(gapeworm, roundworm, mites and lice)including gapeworm, but will not kill tapeworms just for your info.
Found at tractor supply.https://www.backyardchickens.com/t/403549/ivermectin-pour-on
Valbazen will kill tapeworm, roundworm and gapeworm and lots more. Dosage- Dosage is 1/2cc for standard size chickens and 1/4cc for smaller chickens including silkies. https://www.backyardchickens.com/forum/viewtopic.php?id=469556 You can use an oral syringe to squirt it down their throats individually or you can inject it into a small piece of bread and give each chicken a piece of bread....they gobble it up. - dump the eggs for two weekshttps://www.backyardchickens.com/forum/viewtopic.php?id=401475 I've found it at Jefferslivestock.com
Safeguard (fenbendazole)- kills tapeworm, gapeworm, roundworm and more. Safeguard paste (fenbendazole), an excellent wormer. Dosage is a "pea" size amount for for the large ones and a "small pea" size amount for the small ones. It might be easiest to put it on a small piece of bread and give a piece to each bird.https://www.backyardchickens.com/forum/viewtopic.php?id=416541 or safeguard 10% suspension liquid goat wormer; 3cc per gallon of water for 3 days https://www.backyardchickens.com/forum/viewtopic.php?id=272801. Discard eggs for 14 days. Found this online at Tractor Supply. OR Dosage is 1/2cc for standard size chickens and 1/4cc for smaller chickens on a piece of bread https://www.backyardchickens.com/forum/viewtopic.php?id=561908&p=2
Worm with wazine17 first, wait 2 weeks and then worm with either Ivermectin, Valbazen or safe-guard. Withdraw eggs for 14 days.
Worm chart http://healthybirds.umd.edu/Disease/Deworming Birds.pdf
You can allso use Ivermectin paste 1.97% take an put a dab the size of
a 1/2 pencil eraser under there wing in arm pit area rub it in .Note do not eat eggs for 2 weeks
Vary the med given for worming every 6 months. Once you worm for the first time with wazine17, you don't have to worm with it first 6 months down the road. It is best to rotate wormers through out year so parasites do not build up resistance to one type.