Citrizine dosage
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Here is a comprehensive overview of Cetirizine dosing (note: "Citrizine" is a common misspelling of cetirizine):
Cetirizine (Zyrtec) — Dosage Guide
Cetirizine is a second-generation antihistamine (H1-blocker) used for allergic rhinitis, urticaria, and other allergic conditions.
Adult Dosage
| Indication | Dose | Frequency |
|---|---|---|
| Allergic rhinitis (seasonal/perennial) | 10 mg orally | Once daily |
| Chronic idiopathic urticaria | 10 mg orally | Once daily |
| Severe symptoms (off-label) | Up to 20 mg/day | Split into 10 mg twice daily |
Pediatric Dosage
| Age Group | Dose | Frequency |
|---|---|---|
| 6 months – 1 year | 2.5 mg orally | Once daily |
| 1–2 years | 2.5 mg orally | Once or twice daily (max 5 mg/day) |
| 2–5 years | 2.5–5 mg orally | Once daily (max 5 mg/day) |
| 6–11 years | 5–10 mg orally | Once daily |
| ≥12 years | 10 mg orally | Once daily (adult dosing) |
Renal/Hepatic Dose Adjustments
| Condition | Recommended Dose |
|---|---|
| CrCl 11–31 mL/min | 5 mg once daily |
| Hemodialysis (CrCl <7 mL/min) | 5 mg once daily |
| Hepatic impairment | 5 mg once daily |
| End-stage renal disease | Avoid use |
Key Points
- Available forms: Tablets (5 mg, 10 mg), chewable tablets, oral syrup (1 mg/mL, 5 mg/5 mL), orally disintegrating tablets
- With or without food: Can be taken either way; food may slow absorption slightly but does not affect bioavailability
- Onset of action: ~1 hour; peak effect at ~1–2 hours
- Duration: ~24 hours (supports once-daily dosing)
- Sedation: Less sedating than first-generation antihistamines, but mild drowsiness can occur (~14% of patients vs. ~6% with placebo)
- Pregnancy: Category B — generally considered safe; use with caution
- Breastfeeding: Excreted in breast milk; avoid if possible or use lowest effective dose
Contraindications / Cautions
- Hypersensitivity to cetirizine or hydroxyzine (cross-reactivity)
- Use cautiously in elderly patients (increased risk of sedation, falls, urinary retention)
- Avoid concurrent use with CNS depressants or alcohol
Note: Always follow local prescribing guidelines and adjust based on individual patient factors. This information is for reference only and does not substitute for professional medical advice.
Levocet dosage
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Levocet (Levocetirizine) — Dosage Guide
Levocet is a brand name for levocetirizine, the R-enantiomer of cetirizine. It is a third-generation antihistamine, roughly twice as potent as cetirizine at the same dose.
Adult Dosage
| Indication | Dose | Frequency |
|---|---|---|
| Allergic rhinitis (seasonal/perennial) | 5 mg orally | Once daily (evening) |
| Chronic idiopathic urticaria | 5 mg orally | Once daily (evening) |
Pediatric Dosage
| Age Group | Dose | Frequency |
|---|---|---|
| 6 months – 5 years | 1.25 mg (2.5 mL of 0.5 mg/mL syrup) | Once daily (evening) |
| 6–11 years | 2.5 mg (5 mL syrup or half tablet) | Once daily (evening) |
| ≥12 years | 5 mg orally | Once daily (adult dosing) |
Renal Dose Adjustments
| Renal Function (CrCl) | Recommended Dose |
|---|---|
| CrCl ≥80 mL/min (normal) | 5 mg once daily |
| CrCl 50–79 mL/min | 5 mg once daily |
| CrCl 30–49 mL/min | 2.5 mg once daily |
| CrCl 10–29 mL/min | 2.5 mg every 48 hours |
| CrCl <10 mL/min / Hemodialysis | Contraindicated |
Renal adjustment is critical — levocetirizine is primarily renally excreted.
Key Points
- Available forms: Tablets (5 mg), oral syrup (2.5 mg/5 mL or 0.5 mg/mL), film-coated tablets
- When to take: Preferably in the evening to minimize any daytime drowsiness
- With or without food: Food does not affect bioavailability; may slightly delay peak concentration
- Onset: ~1 hour; peak plasma concentration at ~0.9 hours
- Duration: ~24 hours (once-daily dosing)
- Half-life: ~6–10 hours (adults); longer in children and renally impaired patients
- Sedation: Less sedating than cetirizine; drowsiness reported in ~6% of patients
Levocet vs. Cetirizine — Quick Comparison
| Feature | Levocetirizine (Levocet) | Cetirizine (Zyrtec) |
|---|---|---|
| Generation | 3rd | 2nd |
| Usual adult dose | 5 mg | 10 mg |
| Potency | Higher | Lower |
| Sedation | Less | Slightly more |
| Renal caution | More critical | Moderate |
Contraindications / Cautions
- Hypersensitivity to levocetirizine, cetirizine, or hydroxyzine
- End-stage renal disease / hemodialysis patients — contraindicated
- Pediatric patients <6 months — not recommended
- Caution in elderly (risk of sedation, falls)
- Avoid with alcohol or other CNS depressants
This information is for reference only and does not replace professional medical advice. Always follow local prescribing guidelines and individualize dosing based on patient-specific factors.
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