Final answer:
Syrup of ipecac is no longer recommended to treat patients who have ingested a poisonous substance because it induces vomiting, which may worsen some poisonings.
Step-by-step explanation:
Syrup of ipecac is no longer recommended to treat patients who have ingested a poisonous substance because it induces vomiting, which may worsen some poisonings. It is no longer considered an effective treatment because it can cause harm to the patient. Instead, it is recommended to call poison control or seek medical attention immediately for proper treatment.