Hi Samantha, medications cannot be given or dispensed without your vet's consent so it wouldn't be something you would have on hand unless your vet felt it was advisable.
This is the foremost and best article on what exactly stasis and how to treat it:
I suggest you read it in it's entirety and really you don't need to be scared of this, it does not happen with all rabbits and some rabbits never go into stasis.
It is important at this point that you establish yourself with a vet and get your rabbit's examined and start a relationship with the vet in case any emergency arises - I really cannot stress this enough. I've been lucky to have a very good and long relationship with my vet who has helped me care for all my rabbits through the years.