Durvet Penicillin Injectable Shelf Life

[ShiviBear]

Hello fine peeps!
I have a bottle on Durvet Injectable penicillin (penicillin G procaine suspension) that I purchased back in July and used several times on a hen attacked by a hawk.
I will be preforming severe bumblefoot surgery today and want to use this pen g afterwards as I believe it's the best antibiotic I have for the job (also have Tylan 50).

The bottle (80% full) was stored in a butter cubby in the fridge and I made a point to always either use a new needle or soak the needle in rubbing alcohol prior to drawing the contents out.
My fridge is pretty cold and I had to shake the bottle pretty hard in order to mix the contents that separated, the chalky white part was pretty globbed up on the bottom, is that a bad sign?

Does anyone know whether it will still be effective?
The expiration date is June of 2022, but does that still stand once the bottle is used?
I cannot find any specific info online, I've found info for pills and reconstituted penicillin but nothing for injectable.

Thank you kindly for any input.

 

[ChickenCanoe]

If you've kept it refrigerated and out of sunlight and it is within the expiration date period, it should be good.
I have Comb-Pen-48 that I used for bumblefoot surgery but it is expired now. I had kept it refrigerated and wouldn't hesitate to use it before it expired. Just shake it up till it is well mixed.

 

[Chickensandhorsesforlife]

I would still use it.

 

[ShiviBear]

Thank you!