Betahistine Dihydrochloride 8 mg Tablets

Summary of Product Characteristics Updated 13-Jul-2021 | Mylan

1. Name of the medicinal product

Betahistine dihydrochloride 8 mg tablets

2. Qualitative and quantitative composition

Each tablet contains 8 mg of betahistine dihydrochloride equivalent to 5.21 mg betahistine.

For the full list of excipients, see section 6.1.

3. Pharmaceutical form


A round, flat, white to almost white tablet with bevelled edges and the inscription “256” on either side of the score on one tablet side. The diameter is about 7 mm.

4. Clinical particulars
4.1 Therapeutic indications

Betahistine is indicated for the treatment of vertigo, tinnitus, hearing loss and nausea associated with Ménière's syndrome.

4.2 Posology and method of administration


Adults (including the elderly)

Initial oral treatment is 8 mg to 16 mg three times daily, taken with food. Maintenance doses are generally in the range 24 – 48 mg daily. Dosage can be adjusted to suit individual patient needs.

Paediatric population

Betahistine tablets are not recommended for use in children below 18 years due to insufficient data on safety and efficacy.

Geriatric population

Although there are limited data from clinical studies in this patient group, extensive post marketing experience suggests that no dose adjustment is necessary in this patient population.

Patients with renal impairment

There are no specific clinical trials available in this patient group, but according to post-marketing experience no dose adjustment appears to be necessary.

Patients with hepatic impairment

There are no specific clinical trials available in this patient group, but according to post-marketing experience no dose adjustment appears to be necessary.

Method of administration

For oral use.

4.3 Contraindications

Phaeochromocytoma. As betahistine is a synthetic analogue of histamine it may induce the release of catecholamines from the tumour resulting in severe hypertension.

Hypersensitivity to the active substance or to any of the excipients listed in section 6.1.

Concurrent use with antihistamines (see section 4.5).

4.4 Special warnings and precautions for use

Caution is advised in the treatment of patients with peptic ulcer or a history of peptic ulceration, because of the occasional dyspepsia encountered in patients on betahistine.

Caution should be exercised in patients with bronchial asthma.

Patients with bronchial asthma (as clinical intolerance has been seen in a relatively few patients) and history of peptic ulcer need to be carefully monitored during the therapy.

Caution is advised in prescribing betahistine to patients with either urticaria, rashes or allergic rhinitis, because of the possibility of aggravating these symptoms.

Betahistine is not indicated for treatment of the following diseases: benign paroxysmal vertigo and vertigos in relation with a central nervous system disease.

4.5 Interaction with other medicinal products and other forms of interaction

No in vivo interaction studies have been performed. Based on in vitro data, no in vivo inhibition on Cytochrome P 450 enzymes is expected.

In vitro data indicate an inhibition of betahistine metabolism by drugs that inhibit monoamino-oxidase (MAO) including MAO subtype B (e.g. selegiline). Caution is recommended when using betahistine and MAO inhibitors (including MAO-B selective) concomitantly.

As betahistine is an analogue of histamine, interaction of betahistine with antihistamines may in theory affect the efficacy of one of these drugs.

There is a case report of an interaction with ethanol and a compound containing pyrimethamine with dapsone and another potentiation of betahistine with salbutamol.

4.6 Fertility, pregnancy and lactation


There are no adequate data from the use of betahistine in pregnant women. Animal studies do not indicate direct or indirect harmful effects with respect to reproductive toxicity at clinically relevant therapeutic exposure. As a precautionary measure, it is preferable to avoid the use of betahistine during pregnancy.


It is not known whether betahistine is excreted in human milk.

Betahistine is excreted in rat milk. Effects seen post-partum in animal studies were limited to very high doses. The importance of this medicine to the mother should be weighed against the benefits of nursing and the potential risks for the child.


Animal studies did not show effects on fertility in rats.

4.7 Effects on ability to drive and use machines

Vertigo, tinnitus and hearing loss associated with Ménière's syndrome can negatively affect the ability to drive and use machines. In clinical studies specifically designed to investigate the ability to drive and use machines betahistine had no or negligible effects.

However, rare reports of drowsiness associated with betahistine have been made. Patients should be advised that if they are affected in this way they should avoid activities requiring concentration, such as driving or operating machinery.

4.8 Undesirable effects

Betahistine is generally well tolerated and relatively few side effects have been reported.

The frequency categories assigned to the adverse reactions below are estimates; as for most reactions suitable data for calculating incidence are not available. In addition, the incidence of adverse reactions associated with betahistine dihydrochloride may vary according to the indication.

Data from clinical trials were used to determine the frequency of very common to rare undesirable effects. The frequencies assigned to all other undesirable effects (i.e. those occurring at <1/1,000) were mainly determined using post-marketing data, and refer to a reporting rate rather than a true frequency.

The following convention has been used for the classification of frequency:

very common (≥1/10), common (≥1/100 to <1/10), uncommon (≥1/1,000 to <1/100), rare (≥1/10,000 to <1/1,000), very rare (<1/10,000), not known (cannot be estimated from the available data; reported spontaneously during post-marketing use and in scientific literature).

MedDRA system organ class

Very common



Very rare

Not Known

Blood and lymphatic system disorders


Immune system disorders

hypersensitivity reactions, e.g. anaphylaxis

Nervous system disorders



Gastrointestinal disorders

dry mouth, diarrhoea

nausea dyspepsia

mild gastric complaints (e.g. vomiting, gastrointestinal pain, abdominal distension and bloating). These can normally be dealt with by taking the dose during meals or by lowering the dose.

Skin and subcutaneous tissue disorders

Skin rashes, cutaneous and subcutaneous hypersensitivity reactions, in particular angioneurotic oedema, urticaria, rash and pruritus.

General disorder and administrative site conditions



increase of transaminases

Reporting of suspected adverse reactions

Reporting suspected adverse reactions after authorisation of the medicinal product is important. It allows continued monitoring of the benefit/risk balance of the medicinal product. Healthcare professionals are asked to report any suspected adverse reactions via Yellow Card Scheme, Website: or search for MHRA Yellow Card in the Google Play or Apple App Store.

4.9 Overdose


The symptoms of betahistine overdose are nausea, vomiting, dyspepsia, ataxia and seizures at higher doses.

A few overdose cases have been reported. Some patients experienced mild to moderate symptoms with doses up to 640 mg (e.g. nausea, somnolence, abdominal pain). More serious complications (e.g. convulsion, pulmonary or cardiac complications) were observed in cases of intentional overdose of betahistine, especially in combination with other drugs.


No specific antidote. Treatment of overdose should include gastric lavage, symptomatic treatment and standard supportive measures.

5. Pharmacological properties
5.1 Pharmacodynamic properties

Pharmacotherapeutic group: antivertigo preparations, ATC code: N07CA01

The mechanism of action of betahistine is only partly understood. Single oral doses of betahistine of up to 32 mg in normal subjects produced maximal suppression of induced vestibular nystagmus 3-4 hours post-dose, with larger doses being more effective in reducing the nystagmus duration.

There are several plausible hypotheses that are supported by animal studies and human


Betahistine affects the histaminergic system

Betahistine acts both as a partial histamine H1-receptor agonist and histamine H3-receptor antagonist also in neuronal tissue, and has negligible H2-receptor activity. Betahistine increases histamine turnover and release by blocking presynaptic H3-receptors and inducing H3-receptor downregulation.

Pulmonary epithelial permeability in man is increased by betahistine. This is derived from a reduction in the time of clearance from the lung to blood of a radioactive marker. This action is prevented by oral pre-treatment with terfenadine, a known H1 receptor blocker.

Whilst histamine has positive inotropic effects on the heart, betahistine is not known to increase cardiac output and its vasodilator effect may produce a small fall in blood pressure in some patients.

Betahistine may increase blood flow to the cochlear region as well as to the

whole brain

Pharmacological testing in animals has shown that the blood circulation in the striae vascularis of the inner ear improves, probably by means of a relaxation of the precapillary sphincters of the microcirculation of the inner ear.

Betahistine was also shown to increase cerebral blood flow in humans.

Betahistine facilitates vestibular compensation

Betahistine accelerates the vestibular recovery after unilateral neurectomy in animals, by promoting and facilitating central vestibular compensation; this effect characterised by an up-regulation of histamine turnover and release, is mediated via the H3-receptor antagonism. In human subjects, recovery time after vestibular neurectomy was also reduced when treated with betahistine.

Betahistine alters neuronal firing in the vestibular nuclei

Betahistine was also found to have a dose dependent inhibiting effect on spike generation of neurons in lateral and medial vestibular nuclei.

The pharmacodynamic properties as demonstrated in animals may contribute to the therapeutic benefit of betahistine in the vestibular system.

The efficacy of betahistine was shown in studies in patients with vestibular vertigo and with Ménière's disease as was demonstrated by improvements in severity and frequency of vertigo attacks.

5.2 Pharmacokinetic properties


Orally administered betahistine is readily and almost completely absorbed from all parts of the gastro-intestinal tract. After absorption, the drug is rapidly and almost completely metabolised into 2-pyridylacetic acid. Plasma levels of betahistine are very low. Pharmacokinetic analyses are therefore based on 2-PAA measurements in plasma and urine.

Under fed conditions Cmax is lower compared to fasted conditions. However, total absorption of betahistine is similar under both conditions, indicating that food intake only slows down the absorption of betahistine.


The percentage of betahistine that is bound by blood plasma proteins is less than 5 %.


After absorption, betahistine is rapidly and almost completely metabolised into 2- PAA (which has no pharmacological activity).

After oral administration of betahistine the plasma (and urinary) concentration of 2- PAA reaches its maximum 1 hour after intake and declines with a half-life of about 3.5 hours.


2-PAA is readily excreted in the urine. In the dose range between 8 and 48 mg, about 85% of the original dose is recovered in the urine. Renal or faecal excretion of betahistine itself is of minor importance.


Recovery rates are constant over the oral dose range of 8 – 48 mg indicating that the pharmacokinetics of betahistine are linear, and suggesting that the involved metabolic pathway is not saturated.

5.3 Preclinical safety data

Chronic toxicity

Adverse effects in the nervous system were seen in dogs and baboons after intravenous doses at and above 120 mg/kg.

Chronic oral toxicity testing for 18 months in rats at a dose of 500 mg/kg and 6 months in dogs at a dose of 25 mg/kg showed betahistine to be well tolerated with no definitive toxicities

Mutagenic and carcinogenic potential

Betahistine does not have mutagenic potential.

In an 18 months chronic toxicity study in rats betahistine up to a dose of 500 mg/kg did not show any evidence for carcinogenic potential

Reproduction toxicity

Effects in reproductive toxicity studies were observed only at exposures considered sufficiently in excess of the maximum human exposure indicating little relevance to clinical use

6. Pharmaceutical particulars
6.1 List of excipients

Cellulose, microcrystalline

Mannitol (E421)

Citric acid monohydrate (E330)

Silica, colloidal anhydrous

Talc (E553b)

6.2 Incompatibilities

Not applicable.

6.3 Shelf life

3 years

6.4 Special precautions for storage

This medicinal product does not require any special storage condition.

6.5 Nature and contents of container

PVC/PVdC/Aluminium blister strips. Available in packs of 20, 28, 30, 56, 84, 90, 100, 112, 120, 168 and 180 tablets.

Not all pack sizes may be marketed.

6.6 Special precautions for disposal and other handling

No special requirements.

7. Marketing authorisation holder


Potters Bar



United Kingdom

8. Marketing authorisation number(s)

PL No. 04569/0348

9. Date of first authorisation/renewal of the authorisation

Date of last renewal: 9 December 2007

10. Date of revision of the text


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