On certain powdered broad spectrum antibiotics that are used in medicating a birds drinking water there is an expiry date, I am just wonder how long after the expiry date does the medication stop working?

Does it stop working or just not work as well? an example of this type would be such as "Avicycline" from "Aristopet"

Thanks Sco-tie

Edited March 28, 200718 yr by Sco-tie

I would suggest its best not to use any medication past its use by date. Very good reasons for having a use by date.