Do you have an entire flock? Are they all the same age? I agree with twocrowsranch... I will only add that you should use the Search option here on BYC (upper right of the page... opposite your log in name, etc.)...
Search these topics and look for posts by dawg53... "Worming"... "Giving oral medications", "Worming with Valbazen", "Treating mites with Sevin Dust"... "How much Valbazen".....
If you have never wormed at all.. worms are likely at anything over seven or eight months... (even six)... Symptoms can mean she has had worms a while, and is at risk.. chickens can die from worm infestations, from the effects of worms on their system.
Valbazen is a good, safe first time wormer. It must be given orally, individually to each chicken one at a time... I have a neighbor help me.. he catches one at a time inside the coop.. brings it out, he holds and helps, we open the mouth and I use a syringe (no needle) to give 1/2cc/ml per standard chicken... or 1/4cc/ml per small or bantam... and some -- the very heavy ones, the largest.. I may give a touch more.. like 3/4 cc/ml.. to the largest only.
You have to be careful to give it back and to the side, not to get it into the airway.. it does not taste good and they will not swallow this on their own or take it on bread, at least mine won't.
After dosing one, we let it go.. mine free range duing the day.. this way I know who's been done and who hasn't, there are no double doses and no one missed. I buy Valbazen at my local feed store.. it normally comes in a bottle that will expire before you use it, so it's good if you can share it with someone... the cost and the medicine. I also get syringes there..
Valbazen treatment should be repeated in ten days.. ten days after first dose, give another... same process.. WITHHOLD EGGS (don't eat them) from the first dose to the 15th day after the second or last dose.. If you see tapeworm segments in any poop (become a poop watcher... tapeworm segments look sort of like short white rice) it will take more than two doses to get rid of them, they are harder.
Do not eat the eggs for 24 days (if giving two doses)... from first dose on.. eggs are good to eat on 25th day after first dosing.. 15th day after second dosing.
You can look for posts by dawg53 on worming and worming with Valbazen and dosages of Valbazen and egg withholding with Valbazen. Also, buttermilk is a good, easy to give probiotic and can be given on about the fourth day after dosing -- mix some with their food (I mix some water, the buttermilk and some feed to make a nice wet mash) this helps restore their intestinal health after worming. Valbazen works slowly, over a few days.. so.. let it work first.
There are many opinions and there are some other options for worming.... but, Valbazen kills all types of worms, not just one or two.. and giving individually, orally so that you know who got what, etc.. is best.
Trust posts by dawg53 on this subject. Please, use the search option for any and all symptoms you have.. except "lethargy" or "lethargic".... that's too general.
You can also search "Eggbound"... for information and treatment of that, if that is a concern. Mostly, young, new layers get eggbound, in my experience.. it can happen to older hens, but seems to generally be my young ones that have just been laying a short time.
If you Search "normal poop" you will find a thread with a link to a UK site with pictures of normal and not so normal poop. It's helpful.
Best of luck and welcome.
