Final answer:
The nurse should anticipate administering Flumazenil, which is an antidote for benzodiazepine overdose, in a case where a client has taken large amounts of diazepam.
Step-by-step explanation:
In the case of a client who has taken large amounts of diazepam (Valium®), which is a benzodiazepine, the nurse should anticipate administering Flumazenil. Flumazenil acts as a benzodiazepine antagonist and is used to reverse the effects of benzodiazepines, effectively serving as an antidote in cases of benzodiazepine overdose. It is not uncommon for prescription opioid overdose deaths to involve benzodiazepines. However, it is crucial not to confuse Flumazenil with other emergency medications such as Naloxone, which is used for opioid overdoses, or Sodium bicarbonate, which might be involved in cases of acidosis or certain poisonings. Vitamin K is not relevant in the context of benzodiazepine overdose.