I had a friend whose service animal was trained to get her pill container from her purse or bag and bring it to her if she collapsed or otherwise called for them. Not sure what they were, never really asked or talked about it since she never initiated the topic but it was apparently sufficiently life threatening if she were to lose stability in a manner where she couldn’t take her medicine shortly after. I only really knew because there were some rooms her service animal was not authorized to enter and I would fulfill that role for her in those situations.