High fever, muscle rigidity, and altered mental status — stop the drug and treat as an emergency (NMS); notify the provider now.
Before you read
Test yourself first: 3 questions
Question 1 of 3
A client taking risperidone reports breast enlargement and galactorrhea. The nurse recognizes these effects are related to which mechanism?
Answer: A. Risperidone strongly blocks dopamine, which raises prolactin levels (hyperprolactinemia), leading to gynecomastia, galactorrhea, menstrual irregularities, and sexual dysfunction. This is a recognized side effect that should be reported to the provider. It is not caused by increased thyroid hormone, low cortisol, or excess growth hormone. Understanding the prolactin link guides appropriate evaluation and possible medication adjustment.
Question 2 of 3
A client taking risperidone reports breast tenderness and milky nipple discharge, and a female client reports missed periods. Which adverse effect should the nurse identify?
Answer: A. Risperidone and other dopamine-blocking antipsychotics can elevate prolactin levels, causing galactorrhea (breast milk production), gynecomastia, menstrual irregularities, and sexual dysfunction. These findings reflect hyperprolactinemia and should be reported to the provider.
Question 3 of 3
A client taking risperidone develops a shuffling gait, masklike facial expression, and resting tremor. The nurse recognizes this as which medication-induced effect?
Answer: B. Drug-induced parkinsonism (pseudoparkinsonism) is an extrapyramidal effect of antipsychotics caused by dopamine blockade. It mimics Parkinson disease with bradykinesia, masklike facies, shuffling gait, cogwheel rigidity, and tremor, and may be treated with an anticholinergic agent.
Keep the streak going with more questions like these, each with a full rationale.
What is risperidone?
It blocks dopamine (D2) and serotonin (5-HT2) receptors. This treats both positive and negative symptoms of schizophrenia with fewer extrapyramidal symptoms (EPS) than typical antipsychotics such as haloperidol. Among the atypicals, it is the one most likely to raise prolactin, which causes breast and menstrual changes and sexual side effects. The nurse monitors weight and metabolic labs, watches for EPS, tardive dyskinesia, and neuroleptic malignant syndrome (NMS), and prevents falls from orthostatic hypotension.
Key points to remember
- Treats positive and negative symptoms of schizophrenia with less EPS than haloperidol.
- Raised prolactin causes galactorrhea, gynecomastia, amenorrhea or other menstrual changes, and sexual dysfunction.
- Metabolic effects: weight gain, hyperglycemia, and dyslipidemia, though less than with olanzapine or clozapine.
- EPS risk rises with higher doses; tardive dyskinesia and NMS are still possible.
- Orthostatic hypotension and sedation are most likely when the drug is started.
- A long-acting injectable form helps clients who struggle with daily doses.
Signs & symptoms
- ↑Prolactin → galactorrhea
- Gynecomastia, amenorrhea
- Weight gain, metabolic synd
Nursing priorities
- Get baseline weight, fasting glucose, A1C, and lipids, then repeat them over time, because risperidone can cause metabolic syndrome.
- Check blood pressure lying and standing early in therapy and teach slow position changes, because orthostatic hypotension can cause falls.
- Assess for EPS and screen for tardive dyskinesia with the AIMS, because movement disorders can still occur.
- Ask directly about breast changes, menstrual changes, and sexual side effects, because raised prolactin is its signature effect.
- Assess psychotic symptoms and adherence, and discuss the long-acting injectable when adherence is poor.
Labs & values
Worked example
- Cue: A man taking risperidone for schizophrenia quietly mentions breast tenderness and enlargement.
- Meaning: This is gynecomastia from raised prolactin, the signature effect of risperidone.
- Action: Notify the provider, anticipate a prolactin level, and give the client privacy and reassurance that the effect is drug-related.
- Evaluation: The provider adjusts therapy, and the client agrees to report any further side effects instead of stopping the drug on his own.
Patient teaching
- Tell your provider about breast enlargement or discharge, changes in your period, or sexual side effects.
- Weigh yourself regularly. Report more thirst, urination, or hunger than usual.
- Stand up slowly to avoid dizziness and falls.
- Get help right away for uncontrolled movements, stiff muscles, or a high fever.
Common mistakes
- Assuming an atypical antipsychotic cannot cause EPS. Risperidone can, especially at higher doses, and tardive dyskinesia and NMS remain possible.
- Skipping metabolic monitoring because weight gain is less than with olanzapine or clozapine.
- Waiting for clients to bring up breast, menstrual, or sexual changes instead of asking.
- Confusing NMS (fever, rigidity, altered mental status) with ordinary EPS. NMS is an emergency.
Red flags: report now
- High fever, muscle rigidity, and altered mental status — stop the drug and treat as an emergency (NMS); notify the provider now.
- New involuntary movements of the face, tongue, or limbs — notify the provider (possible tardive dyskinesia).
- Increased thirst, urination, or hunger — check glucose and notify the provider (possible new diabetes).
- Dizziness with falls on standing — start fall precautions and notify the provider.
References
Clinical references for this topic
