Many of the listed undesirable effects can be assigned to the anticholinergic properties of ATROVENT. As with all inhalation therapy ATROVENT may show symptoms of local irritation. Adverse drug reactions were identified from data obtained in clinical trials and pharmacovigilance during post approval use of the drug.
The most frequent side effects reported in clinical trials were headache, throat irritation, cough, dry mouth, gastro-intestinal motility disorders (including constipation, diarrhoea and vomiting), nausea and dizziness. (See table.)
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Common ≥ 1/100 - < 1/10; Uncommon ≥ 1/1,000 - < 1/100; Rare ≥ 1/10,000 - <1/1,000.