Which of the following is NOT an antidote for a specific poisoning?

Dextrose is not considered an antidote for specific poisoning; instead, it is primarily used as a source of glucose in cases of hypoglycemia or as a way to provide caloric support. While it plays a supportive role in managing certain conditions, it does not directly counteract the toxic effects of poisons or toxins.

Sodium Bicarbonate, on the other hand, is utilized in the treatment of some drug overdoses, such as those involving certain weak acids, and can help to alkalinize the urine and enhance the excretion of toxins. Pencillamine serves as an antidote in cases of heavy metal poisoning, particularly for copper, lead, and mercury. Flumazenil is an antagonist specifically used to reverse the sedation effects of benzodiazepines, making it a specific antidote for benzodiazepine overdose.

In conclusion, while Sodium Bicarbonate, Pencillamine, and Flumazenil directly counteract the effects of particular poisons, Dextrose does not serve the same specific antidotal role and is therefore the correct answer.