Head shaking today after Ivermectin last night

[TcherDawn]

The girls had worms, so we did Wazine 1st. Then 10 days later (last night), we did 5 drops pour on Ivermectin. Today they are all shaking their heads? Any ideas?
Thanks.
Dawn

 

[FireTigeris]

How much do the chickens weigh and what % Ivermectin ?

http://ratguide.com/meds/anti-infectives/ivermectin.php :

Adverse Reactions
Accurate dosing to prevent severe toxicity required. If toxicity results the vet may prescribe a glucocorticoid.

CNS: lethargy, “drunken gait”,tremors, seizures

GI: anorexia

That site is for rats but I'm guessing toxcidity symptoms would be the same.​

 

[TcherDawn]

5mg per ml? That is what it says on the front.

 

[TcherDawn]

They are all roosting now and I see no head shaking in their sleep?
Tomorrow is Thanksgiving. We are traveling for the day. Before we go, what should I look for in the girls if the head shaking continues tomorrow morning?