My friend who is immunocompromised is getting his first dose tomorrow. They will be drawing blood for anti body test and then give the vaccine. Waiting period o

My friend who is immunocompromised is getting his first dose tomorrow. They will be drawing blood for anti body test and then give the vaccine. Waiting period of 15 mins to see if any side effects. If there is something serious you go to the ER. It would be best not to be alone if there is that risk