Also Known As: Meclizine, Antivert, Bonine, Bonamine, Postafen, Dramamine 2
Meclozine (INN, or meclizine) is an antihistamine considered to be an antiemetic. It is sold under the brand names Bonine, Bonamine, Antivert, Postafen, Sea Legs, and Dramamine (Less Drowsy Formulation). Emesafene is a combination of meclozine (1/3) and pyridoxine (2/3). In Canada, Antivert Tab (which is no longer available) was a combination of meclozine and nicotinic acid.
Meclozine is approved by the U.S. Food and Drug Administration (FDA) to treat symptoms of motion sickness and for management of vertigo that stems from diseases affecting the vestibular system. Meclozine's safety and efficacy in children younger than 12 years old has not been established, therefore use in this population is not recommended. Also, meclozine should be taken with caution in the elderly (older than 65 years) because of increased risk of confusion and amnesia.
Meclozine is effective in inhibiting the symptoms of motion sickness, such as nausea, vomiting, and dizziness. The recommended dose is 25–50 mg orally, taken 1 hour before travel. The dose may be repeated every 24 hours as needed.
The drug is also safe for treating nausea in pregnancy and is a first-line therapy for this use.
Meclozine is an antagonist at H1 receptors. It possesses anticholinergic, central nervous system depressant, and local anesthetic effects. Its antiemetic and antivertigo effects are not fully understood, but its central anticholinergic properties are partially responsible. The drug depresses labyrinth excitability and vestibular stimulation, and it may affect the medullary chemoreceptor trigger zone