What should be the immediate response in case of ingestion of a poisonous substance?

The immediate response to the ingestion of a poisonous substance should prioritize ensuring the patient's safety with the guidance of experts in poison management, which is why contacting the Florida Poison Control Center is the most appropriate action. This resource has trained professionals who can provide tailored advice based on the specific substance ingested, the amount, and the patient’s medical history. They can guide you on whether to induce vomiting or take other measures, such as whether to administer activated charcoal.

The other options might seem like viable responses but do not prioritize the best practice for poison ingestion. Inducing vomiting is not always safe for all substances and can sometimes cause further harm. Administering milk is a common misconception; while it may help with some irritants, it can worsen others. Waiting for symptoms can lead to worsening health effects, as timely intervention is crucial in cases of poisoning. Therefore, reaching out to a specialized poison control center ensures that appropriate and effective steps are taken immediately.