Final answer:
The antidote that should be prepared for administration if acetaminophen overdose is suspected in a client with Bell's palsy is acetylcysteine.
Step-by-step explanation:
The antidote that should be prepared for administration if acetaminophen overdose is suspected in a client with Bell's palsy is acetylcysteine. Acetaminophen overdose can lead to severe damage of the liver, and acetylcysteine is the recommended antidote for acetaminophen poisoning. It works by replenishing the depleted glutathione stores, which helps to protect the liver from the toxic effects of acetaminophen.