II. Indications

III. Mechanism

  1. See Antihistamine
  2. H1 Receptor Antagonist (First Generation Antihistamine)
  3. Meclizine is a synthetic piperazine derivative with Antihistamine (moderate Anticholinergic) and Antiemetic activity

IV. Precautions

  1. Although FDA approved for children, FDA does not recommend routine Antihistamine use age <4 years
    1. Deaths have occurred in younger children related to Anticholinergic Toxicity

V. Dosing

  1. Approved for age >=12 years
  2. Vertigo (not FDA approved)
    1. Dose 25 mg orally four times daily as needed
  3. Motion Sickness
    1. Start: 25 to 50 mg orally 1 hour prior to travel
    2. Next: 25 to 50 mg orally daily during travel

VI. Adverse Effects

VII. Safety

  1. Pregnancy category B
  2. Unknown safety in Lactation

IX. References

  1. Olson (2020) Clinical Pharmacology, Medmaster Miami, p. 146-7
  2. Hamilton (2020) Tarascon Pocket Pharmacopoeia

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Related Studies

Cost: Medications

meclizine (on 12/21/2022 at Medicaid.Gov Survey of pharmacy drug pricing)
MECLIZINE 12.5 MG CAPLET Generic OTC $0.03 each
MECLIZINE 12.5 MG TABLET Generic $0.08 each
MECLIZINE 25 MG TABLET Generic $0.11 each
MECLIZINE 25 MG TABLET CHEW Generic OTC $0.03 each

Ontology: Meclizine (C0025039)

Definition (NCI) A synthetic piperazine with anti-emetic, sedative and histamine H1antagonistic properties. Meclizine blocks the H1 histamine receptor and prevents the symptoms that are caused by histamine activity on capillaries, bronchial and gastrointestinal smooth muscles, including vasodilation, increased capillary permeability, bronchoconstriction, and spasmodic contraction of gastrointestinal smooth muscles. Meclizine hydrochloride may exert its antiemetic effects by its anticholinergic actions or due to a direct effect on the medullary chemoreceptive trigger zone.
Definition (MSH) A histamine H1 antagonist used in the treatment of motion sickness, vertigo, and nausea during pregnancy and radiation sickness.
Concepts Pharmacologic Substance (T121) , Organic Chemical (T109)
MSH D008468
SnomedCT 372879002, 84951002
LNC LP18131-0, MTHU003449
English Meclizine, Meclozine, Parachloramine, Piperazine, 1-((4-chlorophenyl)phenylmethyl)-4-((3-methylphenyl)methyl)-, 1-[(4-Chlorophenyl)phenylmethyl]-4-[(3-methylphenyl)methyl]piperazine, Meclizine [Chemical/Ingredient], meclozine, MECLIZINE, meclizine, Meclizine (product), Meclizine (substance)
Swedish Meklizin
Czech meklizin
Finnish Meklotsiini
Russian PARAKHLORAMIN, MEKLOZIN, MEKLIZIN, GISTAMETIZIN, ГИСТАМЕТИЗИН, МЕКЛИЗИН, МЕКЛОЗИН, ПАРАХЛОРАМИН
Japanese メクロジン, パラクロルアミン, ヒスタメチジン, パラクロールアミン, メクリジン
Italian Meclozina, Paracloramina, Meclizina
Spanish meclozina (sustancia), meclicina (sustancia), meclozina (producto), meclozina, meclicina, meclizina, Meclizina, Meclocina, Paracloramina
Polish Histametyzyna, Meklozyna
French Méclozine
German Meclizin, Meclozin, Parachloramin
Portuguese Meclizina, Meclozina, Paracloramina