谁愿意帮我解释以下这个英语笑话?

题目

谁愿意帮我解释以下这个英语笑话?
A DISTRAUGHT PATIENT phoned her doctor's office.Was it true,the woman wanted to know,that the medication the doctor had prescribed was for the rest of her life?She was told that it was.There was a moment of silence before the woman continued,"I'm wondering,then,just how serious my condition is.This prescription is marked 'no refills'."
主要是最后的“no refills”是什么意思

答案

哦,是不用继续吃药了,不可救药的意思.
那个女的想弄清楚她的病情是不是已经严重到马上就要玩完的地步,因为在 the rest of her life里,已经没有药可以救她了.