Poisoning and Ingestion nursing care: what to assess and what to do first

Recognising it at the bedside

Suspect poisoning when a patient presents with an abrupt, unexplained change in mental status, unexplained metabolic acidosis, or a cluster of symptoms that do not fit a single diagnosis. Look for burns around the mouth, unusual breath odour, pinpoint or dilated pupils, and empty containers or medication blister packs near the patient or in the history given by family. In paediatric patients, a toddler found near an open cabinet with a partly empty bottle is enough to start the workup even without symptoms yet.

Vital signs often give the first clue to the toxin class. Bradycardia with hypotension suggests beta-blocker or calcium channel blocker overdose. Tachycardia, hyperthermia and agitation point toward sympathomimetics or anticholinergics. Bradypnoea and pinpoint pupils suggest opioids. Document the exact time of onset and correlate it with the estimated time of ingestion, because this window drives every decision that follows.

Why the classic presentation misleads

Many nurses still expect poisoning to look dramatic: vomiting, collapse, obvious distress. In practice a large proportion of ingestions, particularly in children and in intentional overdose, are asymptomatic at first contact. A calm, alert patient does not rule out a lethal ingestion, especially with agents like acetaminophen or sustained-release cardiac drugs where toxicity is delayed by hours.

This is also where an outdated instinct causes harm. Older teaching told patients and even some clinicians to induce vomiting at home with syrup of ipecac. That guidance has been withdrawn. Vomiting does not reliably clear the stomach, wastes the window for more effective decontamination, and actively endangers the airway if the substance is caustic, a hydrocarbon, or if the patient's consciousness is or will become impaired. The correct first action is a call to poison control, not an attempt to expel the substance.

Priority nursing actions

Call poison control before initiating any decontamination measure. In the US this is 1-800-222-1222; use the equivalent national service where you practise. Poison control will guide substance-specific management and can prevent unnecessary or harmful interventions. This call happens in parallel with, not instead of, airway and circulatory assessment.

Never induce vomiting. Do not give ipecac, do not attempt to trigger a gag reflex, and correct any family member who has already tried this at home. Secure the airway first if the patient is drowsy or obtunded, since an unprotected airway combined with vomiting risks aspiration. Establish IV access, attach continuous cardiac monitoring for suspected cardiotoxic ingestions, and keep the patient NPO until the plan is confirmed.

Activated charcoal may be given within roughly one to two hours of ingestion for many oral toxins, but only once the airway is protected and the substance is one that binds to charcoal — it is not given for caustics, alcohols, iron, or lithium. Preserve any pill bottles, packaging or vomitus for identification, and keep the patient on continuous monitoring while the toxicology plan is finalised.

Labs and diagnostics to expect

Baseline labs include a comprehensive metabolic panel, arterial or venous blood gas, and a paracetamol (acetaminophen) and salicylate level on essentially every intentional ingestion, since both are common co-ingestants and both have delayed, treatable toxicity. A 12-lead ECG is obtained for any suspected cardiotoxic agent, looking specifically at QRS and QTc widening.

Anion gap and osmolar gap calculations help narrow the differential when the ingested substance is unknown. A urine toxicology screen has real limitations, it detects a narrow panel of drugs and does not confirm timing or dose, so treat a negative screen with caution rather than as reassurance. Serial levels, not a single draw, are often needed for substances with delayed peak toxicity such as extended-release preparations.

Complications and their early signs

Aspiration pneumonitis is the complication most directly tied to vomiting and airway compromise, watch for new hypoxia, crackles or fever in the hours after a witnessed vomiting episode. Seizures can occur with tricyclic antidepressants, bupropion, and several other agents, and often precede cardiovascular collapse.

Dysrhythmias, particularly widened QRS or prolonged QTc, signal impending cardiac arrest with sodium-channel blocking agents. Hepatotoxicity from acetaminophen may not show clinically for 24 to 72 hours despite normal early labs, which is exactly why the level is drawn on presentation rather than waited out. Any downward trend in level of consciousness in a patient previously stable should prompt immediate reassessment of the airway plan.

Teaching that changes outcomes

The single most important message for families and patients is to call poison control immediately and never attempt to make the person vomit. This instruction reverses decades of home-remedy advice, and many caregivers still keep ipecac in a medicine cabinet or believe salt water or a finger down the throat is the right first response. Correcting this belief during discharge teaching prevents repeat harm at the next incident.

For households with young children, teach storage of medications and household chemicals in original, child-resistant containers, out of reach and out of sight, not simply out of reach. For patients recovering from intentional ingestion, teaching extends to safety planning and confirming psychiatric follow-up before discharge, since the ingestion itself is only the presenting event.