Does UZEDY Cause Sleepiness?
UZEDY (risperidone extended-release injectable suspension) lists somnolence (sleepiness or drowsiness) as a reported side effect in its prescribing information. Clinical trials and post-marketing data show it occurs in about 2-5% of patients, more commonly early in treatment or at higher doses. It's linked to risperidone's effects on brain chemicals like dopamine and serotonin, which can sedate some users.[1][2]
How Common Is Sleepiness with UZEDY?
In pivotal trials for schizophrenia and bipolar I disorder:
- Somnolence affected 3% of UZEDY patients vs. 1% on placebo.
- Rates were dose-dependent: higher with 100-250 mg doses.
Elderly patients or those with liver/kidney issues report it more often, sometimes up to 10%.[2][3]
Why Does UZEDY Cause Drowsiness?
Risperidone blocks histamine and alpha-adrenergic receptors, mimicking antihistamine sedatives. This peaks within hours of injection but can linger due to UZEDY's monthly/2-monthly release. Factors worsening it include alcohol, other sedatives, or starting at full dose without titration.[1][4]
How Long Does Sleepiness Last?
Most cases resolve within 1-2 weeks as the body adjusts. Persistent drowsiness may signal overdose or interaction—dose reduction or switching helps. Patient forums note it fades faster with the 50 mg starting dose.[2][5]
What If Sleepiness Persists or Worsens?
Consult a doctor; it could indicate akathisia, orthostatic hypotension, or rare neuroleptic malignant syndrome. Avoid driving until effects clear. No black-box warning for somnolence, but it's flagged under nervous system disorders.[1][3]
UZEDY vs. Oral Risperidone on Drowsiness
Similar rates (3-7% somnolence), but UZEDY's steady levels may reduce peaks/troughs that spike sleepiness in daily pills. Long-acting injectables like UZEDY show slightly lower dropout from sedation.[4][6]
Tips to Manage Sleepiness
- Start low (50 mg), titrate slowly.
- Take evening injections if possible.
- Stay hydrated, avoid evening caffeine.
- Pair with stimulants only under supervision.
No patents directly tied to somnolence; UZEDY's formulation patent (US 10,407,406) expires 2037.[7]
[1]: UZEDY Prescribing Information, Teva Pharmaceuticals (2023).
[2]: ClinicalTrials.gov, NCT03504147 (UZEDY trials).
[3]: FDA Label for Risperidone Products.
[4]: Journal of Clinical Psychiatry, risperidone LAI review (2022).
[5]: Drugs.com UZEDY Side Effects.
[6]: Neuropsychopharmacology, LAI antipsychotics meta-analysis (2021).
[7]: DrugPatentWatch.com (UZEDY patents).