Drilldown: Medicines
Medicines > fda max 
:
10 mg/d (adults) or
600 mg/day (seizures); 450 mg/day (fibromyalgia and neuropathic pain)
:
10 mg/d (adults) or
600 mg/day (seizures); 450 mg/day (fibromyalgia and neuropathic pain) Use the filters below to narrow your results.
generic:
brand:
classes:
[[:Category:Antiasthmatic_agents|Antiasthmatic]] (1) ·
[[:Category:Anticonvulsants|Anticonvulsant]] (1) ·
[[:Category:Antihistamines|Antihistamine]] (2) ·
[[:Category:Gabapentinoids|Gabapentinoid]] (1) ·
[[:Category:H1_receptor_antagonists|Histamine H1 receptor antagonist (second-generation)]] (2) ·
[[:Category:Leukotriene_receptor_antagonists|Leukotriene receptor antagonist]] (1) ·
[[:Category:Neuropathic pain medicines|Neuropathic pain medicine]] (1) ·
[[:Category:Schedule V controlled substances|Schedule V controlled substance]] (1)
mechanism:
None (2) ·
'"`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-0000061E-QINU`"' Less reliably anticholinergic than first-generation H1s; minimal antiemetic effect. Desloratadine (Clarinex) is the active enantiomer-of-metabolite version marketed as a Rx alternative. (1)
uses:
'"`UNIQ--vote-0000001F-QINU`"', '"`UNIQ--vote-00000020-QINU`"', '"`UNIQ--vote-00000021-QINU`"', '"`UNIQ--vote-00000022-QINU`"', '"`UNIQ--vote-00000023-QINU`"', '"`UNIQ--vote-00000024-QINU`"', '"`UNIQ--vote-00000025-QINU`"' (1) ·
'"`UNIQ--vote-0000015B-QINU`"', '"`UNIQ--vote-0000015C-QINU`"', '"`UNIQ--vote-0000015D-QINU`"' (1) ·
'"`UNIQ--vote-00000393-QINU`"', '"`UNIQ--vote-00000394-QINU`"', '"`UNIQ--vote-00000395-QINU`"' (1) ·
'"`UNIQ--vote-0000061F-QINU`"', '"`UNIQ--vote-00000620-QINU`"' (1)
starting dose:
10 mg PO once daily (1) ·
10 mg PO once daily (5 mg in older adults or if sedation occurs) (1) ·
10 mg PO once daily in the evening (adults); 4-5 mg in children (1) ·
Neuropathic pain: 75 mg PO BID, titrate to 150 mg BID after 1 week. Fibromyalgia: 75 mg PO BID, titrate to 150 mg BID. Anxiety (off-label): 75-150 mg/day divided BID-TID (1)
preparations:
10 mg tablets; 4 mg, 5 mg chewables; 4 mg granules (1) ·
10 mg tablets; 5 mg ODT and chewables; 1 mg/mL oral syrup; combo Claritin-D (with pseudoephedrine, behind-counter) (1) ·
5 mg, 10 mg tablets; 5 mg, 10 mg chewables; 1 mg/mL oral syrup; OTC (1) ·
Capsules 25, 50, 75, 100, 150, 200, 225, 300 mg; oral solution 20 mg/mL; Lyrica CR tablets 82.5, 165, 330 mg (1)
fda max: (Click arrow to add another value)
routes:
onset:
halflife:
2.7-5.5 hours'"`UNIQ--ref-0000015E-QINU`"' (1) ·
6.3 hours'"`UNIQ--ref-00000026-QINU`"' (1) ·
8-10 hours (longer in elderly and renal impairment)'"`UNIQ--ref-00000396-QINU`"' (1) ·
~8 hours (parent); ~28 hours (desloratadine, the active metabolite, marketed separately as Clarinex)'"`UNIQ--ref-00000621-QINU`"' (1)
bioavailability:
High (oral); not significantly affected by food'"`UNIQ--ref-00000397-QINU`"' (1) ·
High (oral; food prolongs absorption modestly)'"`UNIQ--ref-00000622-QINU`"' (1) ·
~64% (oral; not significantly affected by food)'"`UNIQ--ref-0000015F-QINU`"' (1) ·
≥90% (linear pharmacokinetics, distinguishing it favorably from gabapentin's saturable LAT-1 absorption)'"`UNIQ--ref-00000027-QINU`"' (1)
pregnancy:
Generally considered safe; pregnancy registries do not show increased major malformation risk.<sup class="pcp-cn" title="This claim needs a citation.">[[[Pharmacopedia:Citation needed|citation needed]]]</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.">[[[Pharmacopedia:Citation needed|citation needed]]]</sup> (1) ·
Generally considered safe; widely used. Loratadine and cetirizine are the most-recommended 2nd-gen H1s in pregnancy and lactation.<sup class="pcp-cn" title="This claim needs a citation.">[[[Pharmacopedia:Citation needed|citation needed]]]</sup> (1) ·
Some signal for major congenital malformations; limited human data.<sup class="pcp-cn" title="This claim needs a citation.">[[[Pharmacopedia:Citation needed|citation needed]]]</sup> (1)
legal:
'''[[USLegal:Schedule V|Schedule V controlled substance]] in US (federally)''', distinct from gabapentin which remains federally unscheduled'"`UNIQ--ref-00000028-QINU`"' (1) ·
OTC in US (2) ·
[[USLegal:Prescription only|Rx-only]] in US. '''FDA Boxed Warning (2020):''' neuropsychiatric events including agitation, depression, sleep disturbance, and suicidal thoughts; benefit-risk should be reassessed regularly'"`UNIQ--ref-00000160-QINU`"'. (1)
Showing below up to 4 results in range #1 to #4.