Does Botox expire? We have had the same unmixed (no solution) vial for almost 6 months.

If you look at the vial you should clearly see an expiration date on it. There is also an expiry date and lot number on the packaging. 

Botox does expires, the expiration date is at the bottom of the box with the lot number too. One the Botox is reconstituted and the vacuum is not violated, may last for 1 week.

I am confused by your question.  The vial has an expiration date on it.  Usually there is at least one year on a newly purchased vial from allergen.  

Of course it can expire,simply read the label should be right there unless you got some suspect"non Allergan" product

I'm sorry...but as an injector you should know the answer to this! Botox vials are labeled on the side of the box and the vial itself with an expiration date. This expiration date is for pre-constitution. "This answer has been solicited without seeing this patient and
cannot be held as true medical advice, but only opinion. Seek in-person
treatment with a trained medical professional for appropriate care."