Is Corid good till its expiration date once opened?

[Red Horse]

It sounds like a dumb question now that I'm typing it out, but I bought and used this Corid back in probably 2023. I've kept it in the fridge ever since and it has an expiration date of 2026. In anyone's experience, has its efficacy seemed to decline after having been opened for that long? I lost one girl last night and have another who is doing really poorly so I started the flock on it today.

 

[Eggcessive]

Is it powder or liquid? I would think the liquid would stay fresh, but the powder might degrade if exposed to air. However I would think that it would be good until the expiration date. I have used expired medicines without problems, ut it depends on how it was stored and how long expired.

What are the symptoms and age. What state are you in? A necropsy can be done in most states on M-F if the body is keep cold but not frozen. Each state vet lab is a little different. Here is a list of them, and how to handle the body:
https://www.metzerfarms.com/poultry...L5h4Xt137GBu32pWJZSRUY5DYhQyVrd4ODmF-Ab8otocc

 

[Red Horse]

Is it powder or liquid? I would think the liquid would stay fresh, but the powder might degrade if exposed to air. However I would think that it would be good until the expiration date. I have used expired medicines without problems, ut it depends on how it was stored and how long expired.

What are the symptoms and age. What state are you in? A necropsy can be done in most states on M-F if the body is keep cold but not frozen. Each state vet lab is a little different. Here is a list of them, and how to handle the body:
https://www.metzerfarms.com/poultry...L5h4Xt137GBu32pWJZSRUY5DYhQyVrd4ODmF-Ab8otocc

It's the liquid. When I have some help here soon I'll give her a drench and if she doesn't start improving I'll buy some new. She has that classic coccidiosis stance with her diarrhea butt tucked under, super pale comb and wattles, and is very lethargic. She's eaten close to 2tbsp scrambled egg and a little grain moisten with some of her corid water, and she drank a little of that too.

I had a non-stop outbreak of coccidiosis a couple years ago where one flock member at a time would get deathly ill and I managed to nurse each of them through it as they got it, so she's making me optimistic with her willingness to eat and drink a little. I've been beating myself up because the Barnevelder who died last night was my first ever loss despite all of that... my husband has been caring for the chickens for the last few months since I'm having a hard pregnancy and he doesn't know what to look for, so if I had ventured out there more often maybe I could have caught it sooner like my previous outbreak.