, sold under the brand name Serc among others, is an anti-vertigo medication. It is commonly prescribed for balance disorders or to alleviate vertigo symptoms associated with Ménière's disease. It was first registered in Europe in 1970 for the treatment of Ménière's disease.
is used in the treatment of Ménière's disease and vertigo. The supporting evidence for the efficacy of Betahistine
for Ménière's disease is of poor quality. A 2011 Cochrane review of seven trials consisting of 243 patients with Ménière's disease concluded that there was insufficient evidence for any beneficial effect of Betahistine
on symptoms. Most of the trials found a reduction in symptoms of vertigo and to a lesser extent tinnitus, but these effects may have been due to bias in study methodology.
is contraindicated for people with pheochromocytoma. People with bronchial asthma and history of peptic ulcer need to be closely monitored.
Patients taking Betahistine
may experience following side effects:
may also cause several digestive-related side effects. The package insert for Serc, a trade name for Betahistine
, states that patients may experience several gastrointestinal side effects. These may include nausea, upset stomach, vomiting, diarrhea and stomach cramping. These symptoms are usually not serious and subside between doses. Patients experiencing chronic digestive problems may lower their dose to the minimum effective range and by taking Betahistine
with meals. Additional digestive problems may require that patients consult their physician in order to find a possible suitable alternative.
People taking Betahistine
may experience several other side effects ranging from mild to serious. The package insert for Serc states that patients may experience nervous-system side effects, including headache. Some nervous system events may also partly be attributable to the underlying condition rather than the medication used to treat it. The study by Jeck-Thole and Wagner also reports that patients may experience headache and liver problems, including increased liver enzymes and bile-flow disturbances. Any side effects that persist or outweigh the relief of symptoms of the original condition may warrant that the patient consult their physician to adjust or change the medication.
is a strong antagonist of the histamine H3 receptor and a weak agonist of the histamine H1 receptor.
has two mechanisms of action. Primarily, it a full agonist on the H1 receptors located on blood vessels in the inner ear. This gives rise to local vasodilation and increased permeability, which helps to reverse the underlying problem of endolymphatic hydrops.
More importantly, Betahistine
has a powerful antagonistic effects at H3 receptors, thereby increasing the levels of neurotransmitters histamine, acetylcholine, norepinephrine, serotonin, and GABA released from the nerve endings. The increased amounts of histamine released from histaminergic nerve endings can stimulate receptors. This stimulation explains the potent vasodilatory effects of Betahistine
in the inner ear, that are well documented.
seems to dilate the blood vessels within the inner ear which can relieve pressure from excess fluid and act on the smooth muscle.
It is postulated that Betahistine
's increase in the level of serotonin in the brainstem inhibits the activity of vestibular nuclei.
comes in both a tablet form as well as an oral solution, and is taken orally. It is rapidly and completely absorbed. The mean plasma elimination half-life is 3 to 4 hours, and excretion is virtually complete in the urine within 24 hours. Plasma protein binding is very low. Betahistine
is transformed into aminoethylpyridine and hydroxyethylpyridine and excreted with the urine as pyridylacetic acid. There is some evidence that one of these metabolites, aminoethylpyridine, may be active and exert effects similar to those of Betahistine
on ampullar receptors.
chemically is 2-[2-(methylamino)ethyl]pyridine, and is formulated as the dihydrochloride salt. Its chemical structure closely resembles those of phenethylamine and histamine.
is marketed under a number of brand names including Veserc, Serc, Hiserk, Betaserc, and Vergo.
is widely used and available in Europe, including in the United Kingdom. It is not available in the United States.