Psychiatric medication red flags
A time axis from hours to years carrying six labeled syndrome markers, with an inset two-cell box comparing the fast hyperreflexic syndrome against the slower rigid one.
Time of onset plus one physical finding names the syndrome. No agent names appear on this page; recognition is the skill being tested.
| SEROTONIN EXCESS | NEUROLEPTIC MALIGNANT SYNDROME | |
|---|---|---|
| Onset | Hours after a new or added serotonergic agent | Days after starting or increasing an antipsychotic |
| Muscles | Tremor, hyperreflexia, clonus | Lead pipe rigidity, hyporeflexia |
| Temperature | Elevated | High fever |
| Other | Agitation, diaphoresis, gastrointestinal upset | Altered consciousness, unstable blood pressure and heart rate |
| The tell | Fast plus reflexes | Slow plus rigidity |
Hours · acute dystonia Sudden sustained muscle contraction of the neck, jaw, tongue, or eyes within hours to days of starting or increasing an antipsychotic. It is frightening for the patient and it can involve the airway, so it is treated urgently rather than observed.
Days to weeks · akathisia An inner restlessness the patient cannot sit through, often misread as worsening anxiety or agitation. Increasing the antipsychotic makes it worse, which is exactly why misreading it is dangerous.
Weeks · parkinsonian effects Tremor, rigidity, shuffling gait, and masked facies emerging over weeks. It is reversible, unlike the late syndrome, and it is a significant fall risk.
Months to years · tardive dyskinesia Involuntary repetitive movements of the face, tongue, and trunk after long exposure. It may be permanent, so reporting the first lip smacking or tongue movement is the tested nursing action.
Two standing patient-teaching watches
- Mood stabilizer toxicity rises with dehydration, sodium loss, vomiting, diarrhea, and heat. Teach consistent fluid and salt intake and instruct the patient to report vomiting, diarrhea, or prolonged heat exposure.
- One antipsychotic carries a risk of losing white cells, so any sore throat, fever, or mouth ulcer during treatment is reported the same day.
Memory hookHours and reflexes, or days and rigidity.
Margin noteevery one of these is reported, not monitored.
Watch outfever with rigidity, or fever with clonus, is an emergency. The medication is held and the provider is called.
TakeawayOnset time plus one physical finding names the syndrome.
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