I personally do not use Wazine.... it only, only kills roundworms and chickens get several types of worms. If you are seeing tapeworm segments, like white rice, Wazine will not kill tapeworms. And, since it specifically says on the label NOT to give it to laying chickens ... egg laying chickens for egg production... I think it is too little results for too much risk... just my opinion.
Do a Search here on BYC.. Search topics such as -- "worming", "worming with Valbazen", "giving oral medications", "treating for tapeworms", "egg withholding while worming", and.... if you put in "Normal poop" you will find links to websites that show you pictures of what is normal and what is not normal in chicken poop. Some little round blood "cells" are a normal thing in chicken poop. And, there are a variety of normal poops for chickens.
Valbazen is a safe first wormer.. it kills all types of worms... for all the "regular types" you will worm twice with it..
1/2 cc / ml per Standard size chicken... and, 1/4 cc / ml per bantam or small chicken.. and, I think if you have any "Giant" chickens, you would give more.. like 3/4 cc / ml --
You can get Valbazen at most feed stores, it is not cheap and is not labeled for chickens, and you will also need some syringes, a couple... no needles
Withhold eggs from day one of worming... do not eat eggs or chickens being wormed....
REPEAT with Valbazen ten days after first dose... continue to withhold eggs for another 14 days... safe to eat eggs on 15th day after second dose or 25th day from first dose...
Now, the catch is.. if your chickens have tapeworms... if you see tapeworm segments (like white rice.. if you catch the right when they poop, see it immediately, they will move for a few seconds)... yucky.
Tapeworms take additional treatments and poopwatching is the key... watch the poop closely... follow around some of the chickens after the second dose.. say five or so days after... up to just before you would give a third dose -- check the poop -- if you see tapeworm segments.. you would need to dose a third... and maybe even a forth time.. every ten days... and still withhold eggs for the duration and until the 15th day after the last dose of wormer.
If you search and read up on worming, look for posts by dawg53... more recent posts, the posts in more recent years.. not from many years ago... we all learn as we go along and experience.
If you are not in the US, wormers are different. If you have trouble getting a wormer.... you can order from jefferslivestock.com -- but, check at the feedstore and don't ask for "chicken wormer", ask for Valbazen by name, and some syringes so as to give the correct dosage to each chicken, orally, individually.
Oh, and chickens get worms from the bugs and worms they eat.. my dogs eat chicken poop AND MY CHICKENS EAT THE DOG POOP!! I have been told this does not cause either one to get worms from the other... My cat gets worms from the animals (mice, birds, etc.) she kills and eats. I believe it has to be a living host to carry the worms.. worm eggs.
Also.. check all your chickens for mites and lice regularly... Sevin Dust on the chickens, clean coop, nests, roosts.. and give a light dusting to those as well. Prevention, now and then... treatment, repeat in ten days also.. eggs hatch from mites as well as from worms. Important to repeat treatments.
If you used Wazine already... use the Valbazen ten days after... and watch the poop ... you may need to use the Valbazen a second time. (or more if they have tapeworms). Another problem with Wazine is ... how much did each chicken get? Was it enough? Did they drink ALL the medicated water? Dosing orally, individually might be a little scary the first time or two, but it's very precise and you are sure who got what and how much? Also, sick birds often will not eat or drink, so any that are feeling bad might not have gotten any wormer in the water, or little.
Take care.. good luck.
Good luck.