Can patients with end-stage renal disease take Atarax (hydroxyzine)?

Can ESRD Patients Take Atarax (Hydroxyzine)?

Yes, ESRD patients can take Atarax (hydroxyzine), but it requires cautious dosing with a 50% dose reduction and close monitoring for sedation, particularly in elderly patients.

Dosing Guidance for ESRD

The FDA label for Atarax does not provide specific dosing adjustments for renal impairment, stating only that "the extent of renal excretion of ATARAX has not been determined" 1. However, elderly patients with decreased renal function should be started on low doses and observed closely due to increased risk of confusion and over-sedation 1.

Based on general CKD prescribing principles from KDOQI guidelines, medications that may accumulate in renal failure require dose adjustments 2. While hydroxyzine is not specifically listed in the guideline tables, the principle of starting at lower doses for patients with severe renal impairment applies.

Clinical Evidence Supporting Use

Hydroxyzine has been successfully used in dialysis patients for uremic pruritus, which is a common and debilitating symptom affecting 60-80% of ESRD patients 3:

• A 2020 randomized crossover trial demonstrated that hydroxyzine 25 mg/day orally significantly reduced pruritus severity in hemodialysis patients, with pruritus scores decreasing from 6.83 to 2.86 over 6 weeks (P = 0.001) 3
• A 2015 study confirmed hydroxyzine's effectiveness in reducing all pruritus parameters in hemodialysis patients 4
• Both studies used relatively low doses (25 mg/day) with apparent safety in this population

Key Safety Considerations

Sedation Risk

• The primary concern is hypersedation, especially given the potentiating effects with other CNS depressants 1
• Elderly ESRD patients are particularly vulnerable to confusion and over-sedation 1
• Patients must be warned against driving or operating machinery 1

Drug Interactions

• Avoid concurrent use with other CNS depressants (narcotics, barbiturates, alcohol) or reduce their doses 1
• The FDA label specifically warns about potentiating action with CNS depressants 1

Dialyzability

• Hemodialysis is unlikely to remove hydroxyzine in overdose situations 1
• This suggests the drug is not significantly dialyzed, meaning dose adjustments should not be based on dialysis timing

Practical Prescribing Algorithm

1. Start with 25 mg/day orally (the dose validated in dialysis studies) 3, 4
2. Monitor closely for sedation in the first 1-2 weeks
3. Review all concurrent medications for CNS depressant effects and adjust accordingly
4. Avoid in elderly patients taking multiple sedating medications unless benefits clearly outweigh risks
5. Do not increase dose without careful assessment of tolerability

Common Pitfalls to Avoid

• Do not use standard doses without considering reduced clearance in ESRD
• Do not combine with multiple CNS depressants without dose reductions of other agents
• Do not assume dialysis will clear the drug in case of oversedation
• Do not overlook alternative causes of pruritus that may be more effectively treated (hyperphosphatemia, inadequate dialysis)

The evidence supports cautious use of hydroxyzine in ESRD patients, particularly for uremic pruritus, but requires vigilance for sedation and drug interactions given the lack of specific pharmacokinetic data in this population.