Skin and subcutaneous tissue disorders: Rare: various types of rash, pruritis and urticaria/angioneurotic oedema.
These reactions are probably related to the histamine like structure of betahistine.
There was a single case of Stevens Johnson syndrome.
Body as a whole: Common: headache. Rare: tiredness and malaise.
Gastrointestinal system: Common: nausea and dyspepsia. Rare: vomiting, diarrhoea, abdominal distension, bloating and epigastric pain have been reported. These symptoms were usually mild. Gastrointestinal disturbances may be relieved by reducing the dose or by taking betahistine with meals.
Nervous system: Rare: dizziness. Very rare: convulsions, somnolence, confusion and hallucinations.
Some of these symptoms may also be observed as part of the disease condition and are usually resolved without changes to the treatment schedule.
Patients with neurological events usually presented with confounding factors.
Cardiovascular system: Very rare: vasodilation, postural hypotension and tachycardia.
Respiratory system: Very rare: dyspnoea, asthma and bronchospasms (see Precautions).
Immune system disorders: Hypersensitivity reactions, e.g. anaphylaxis have been reported.
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