Which of the following should NOT be given to a casualty who is suspected of poisoning?

When a casualty is suspected of poisoning, it is crucial to avoid administering food. The reason for this is that consuming food could interfere with potential medical treatment that may be necessary, particularly if an antidote is required or if a medical procedure is needed to remove the poison from the body. Additionally, certain types of poison may react negatively with food, aggravating the situation rather than alleviating it.

In emergencies involving poisoning, it’s vital to keep the airway clear and avoid introducing anything that could complicate the patient's condition or the effectiveness of the treatment. In many cases, medical professionals may want to perform actions like inducing vomiting or administering specific antidotes, and food could hinder those processes.

Water is usually considered acceptable in some cases to dilute the poison, but this may vary depending on the type of poison ingested. Oxygen can be given to assist in cases of respiratory distress due to poisoning. Antidotes, if available and appropriate for the specific poison, are critical in mitigating the effects of the harmful substance. Therefore, food should definitely be avoided in these scenarios.