The adverse effects include drowsiness, dizziness, confusion, constipation, anxiety, nausea, blurred vision, restlessness, decreased coordination, dry mouth, shallow breathing, hallucinations, irritability, problems with memory or concentration, tinnitus and trouble urinating.<unk>  produces less sedation than other first-generation antihistamines. A large study on people 65 years old or older, linked the development of Alzheimer's disease and other forms of dementia to the use of<unk>  and other first-generation antihistamines, due to their anticholinergic properties.
Chlorphenamine
Phenethylamine
Methoxyphenamine
Beclamide
Nicergoline
Phenoxypropazine
Mephentermine
Brompheniramine