Drilldown: Medicines

Cetirizine (1) · Fexofenadine (1) · Levocetirizine (1)

Allegra, Allegra Allergy 24 Hour, Mucinex Allergy (combo) — all now OTC in US (1) · Xyzal, Xyzal Allergy 24HR (OTC) (1) · Zyrtec, Zyrtec-D (1)

Research material · Classic Psychedelic · Stimulant · Opioid · Sedative-hypnotic · Phenethylamine · Tryptamine · Benzodiazepine · Botanical · [[:Category:Antihypertensives|Antihypertensive]] · Dissociative · Anticonvulsant · Antidepressant · Plant Medicine · Analgesic · Antipsychotic · Antiparkinsonian · Empathogen · Neuroleptic · Cathinone

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'"`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-00000950-QINU`"' Mostly renally cleared unchanged; dose-reduce in renal impairment. Like cetirizine, retains slightly more sedation than fexofenadine in some users'"`UNIQ--ref-00000951-QINU`"'. (1) · '"`UNIQ--vote-00000CC9-QINU`"' Mostly excreted unchanged in feces and urine; P-glycoprotein substrate (the basis of the fruit-juice interaction). (1)

'"`UNIQ--vote-00000393-QINU`"', '"`UNIQ--vote-00000394-QINU`"', '"`UNIQ--vote-00000395-QINU`"' (1) · '"`UNIQ--vote-00000952-QINU`"', '"`UNIQ--vote-00000953-QINU`"' (1) · '"`UNIQ--vote-00000CCA-QINU`"', '"`UNIQ--vote-00000CCB-QINU`"' (1)

10 mg PO once daily (5 mg in older adults or if sedation occurs) (1) · 5 mg PO once daily in the evening (1) · 60 mg PO BID or 180 mg PO once daily (1)

30, 60, 180 mg tablets; 30 mg ODT; 6 mg/mL oral suspension; all OTC (1) · 5 mg tablets; 2.5 mg/5 mL oral solution; OTC (1) · 5 mg, 10 mg tablets; 5 mg, 10 mg chewables; 1 mg/mL oral syrup; OTC (1)

10 mg/d (adults) (1) · 180 mg/d (adults) (1) · 5 mg/d (adults) (1)

Oral (3)

None · Hours · 30-60 minutes · 1-2 hours · ~30 min · LDL lowering at 2 weeks, max by 4 weeks · ~1 hour · 15-30 minutes · 15–30 min · 1–2 h · 30–60 min · Antidepressant effect emerges over 1-2 weeks · BP and symptomatic LUTS improvement within 1-2 weeks · BP effect within 1-2 weeks · Clinical improvement within 24-72 hours · Days · Motor improvement over days at therapeutic dose · Over weeks · Postprandial glucose effect within days; HbA1c by 12 weeks · Sleep effect from first dose; antidepressant effect over 1-4 weeks

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12-24 hours (1) · 24 hours (2)

8-10 hours (longer in elderly and renal impairment)'"`UNIQ--ref-00000396-QINU`"' (1) · ~14 hours'"`UNIQ--ref-00000CCC-QINU`"' (1) · ~8 hours (longer in elderly and renal impairment)'"`UNIQ--ref-00000954-QINU`"' (1)

High (oral); not significantly affected by food'"`UNIQ--ref-00000397-QINU`"' (1) · ~33% (oral; fruit juices including grapefruit, orange, and apple reduce absorption substantially via OATP1A2 inhibition — distinctive interaction not seen with most other H1s)'"`UNIQ--ref-00000CCD-QINU`"' (1) · ~85-90% (oral; not significantly affected by food)'"`UNIQ--ref-00000955-QINU`"' (1)

Generally considered safe; loratadine and cetirizine have more pregnancy data and are typically preferred.<sup class="pcp-cn" title="This claim needs a citation.">&#91;[[Pharmacopedia:Citation needed|citation&nbsp;needed]]&#93;</sup> (1) · Generally considered safe; widely used. Cetirizine and loratadine remain the more-studied alternatives.<sup class="pcp-cn" title="This claim needs a citation.">&#91;[[Pharmacopedia:Citation needed|citation&nbsp;needed]]&#93;</sup> (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 (3)