Drilldown: Medicines

Cetirizine (1)

Zyrtec, Zyrtec-D (1)

[[:Category:Antihistamines|Antihistamine]] (1) · [[:Category:H1_receptor_antagonists|Histamine H1 receptor antagonist (second-generation)]] (1)

'"`UNIQ--vote-00000391-QINU`"' Minimal CYP metabolism; mostly renally cleared unchanged. Cetirizine is the active racemate; levocetirizine is the active R-enantiomer marketed separately'"`UNIQ--ref-00000392-QINU`"'. (1)

'"`UNIQ--vote-00000393-QINU`"', '"`UNIQ--vote-00000394-QINU`"', '"`UNIQ--vote-00000395-QINU`"' (1)

10 mg PO once daily (5 mg in older adults or if sedation occurs) (1)

5 mg, 10 mg tablets; 5 mg, 10 mg chewables; 1 mg/mL oral syrup; OTC (1)

None · Indication-specific · 40 mg/d · 10 mg/d · 20 mg/d · 80 mg/d · 10 mg/d (adults) · 100 mg/d · 4 g/d · 400 mg/d · 40 mg/d typical; up to 240 mg/d for Zollinger-Ellison · 5 mg/d · 50 mg/d · 600 mg/d · No fixed ceiling; titrate to clinical effect and tolerability with CDC opioid prescribing guidance constraints on morphine-milligram-equivalent (MME) totals · No fixed maximum; titrated to TSH target · TID per eye · Titrated to glucose; no fixed ceiling · Titrated to glucose; no fixed maximum · '''20 mg/day in adults >60 years''' per FDA's 2011-2012 QT-prolongation warning; 40 mg/day in adults ≤60

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Oral (1)

30-60 minutes (1)

None · 24 hours · 4-6 hours · 12 hours · 6-8 hours · Daily dosing · 8-12 hours · 12-24 hours · Hours · Hours per application · 24 hours (HS dosing) · 24 hours (once-daily dosing) · 24 h · N/A · N/A (replacement) · Variable · ~7-8 hours · 3-5 hours · 4-6 hours (IR); 24 hours (ER) · 6-12 hours

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None · ~12 hours · ~27 days · ~5 h (caffeine) · '''Autoinduction''': 25-65 hours initially, falling to 12-17 hours after 2-3 weeks of dosing as carbamazepine induces its own CYP3A4 metabolism. Major clinical implication: doses require re-titration after the autoinduction period'"`UNIQ--ref-0000001D-QINU`"' · 0.5-1.5 hours (plasma); pharmacodynamic effect persists 24+ hours'"`UNIQ--ref-000000DE-QINU`"' · 1-1.3 hours'"`UNIQ--ref-000001A1-QINU`"' · 1-1.5 hours'"`UNIQ--ref-00000DE3-QINU`"' · 1-2 hours (parent compound)'"`UNIQ--ref-00000029-QINU`"' · 1-2 hours (parent); 18-30 hours for active metabolite oxypurinol'"`UNIQ--ref-0000030F-QINU`"' · 1-2 hours'"`UNIQ--ref-00000017-QINU`"' · 1-3 days acute, 4-6 days chronic; 4-16 days for norfluoxetine'"`UNIQ--ref-0000004C-QINU`"' · 1-3 hours (normal liver); markedly prolonged in overdose with glutathione depletion'"`UNIQ--ref-00000022-QINU`"' · 1-3 minutes (very short)'"`UNIQ--ref-00000C0F-QINU`"' · 1.4 hours (parent); 13-24 hours for active metabolite canrenone'"`UNIQ--ref-00000354-QINU`"' · 1.5-2 hours (longer in renal failure)'"`UNIQ--ref-00000222-QINU`"' · 1.5-2 hours'"`UNIQ--ref-00000020-QINU`"' · 10-11 hours (benazeprilat, the active metabolite)'"`UNIQ--ref-00000A22-QINU`"' · 11-13 h (immediate-release); 11-16 h (extended-release) · 11-15 hours'"`UNIQ--ref-00000842-QINU`"'

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High (oral); not significantly affected by food'"`UNIQ--ref-00000397-QINU`"' (1)

Generally considered safe; widely used. Levocetirizine (the R-enantiomer) is an alternative with similar safety.<sup class="pcp-cn" title="This claim needs a citation.">&#91;[[Pharmacopedia:Citation needed|citation&nbsp;needed]]&#93;</sup> (1)

OTC in US (1)