Some documented side effects include: * Tardive dyskinesia, pseudoparkinsonism, acute dystonia (effects due to dopamine D2 receptor antagonism) * Confusion in the elderly * Drowsiness, dizziness, fatigue, more rarely vertigo *Known to have effects on serotonin and dopamine receptors. * Dry mouth * Nausea * Respiratory depression in patients under age of two and in those with severely compromised pulmonary function * Blurred vision, xerostomia, dry nasal passages, dilated pupils, constipation, and urinary retention. (due to cholinergic effects) * Chest discomfort/pressure (In children less than 2 years old) * Akathisia Less frequent: * Cardiovascular side effects to include arrhythmias and hypotension * Neuroleptic malignant syndrome * Liver damage and cholestatic jaundice * Bone marrow suppression, potentially resulting in agranulocytosis, thrombocytopenia, and leukopenia * Depression of the thermoregulatory mechanism resulting in hypothermia/hyperthermia Rare side effects include: * Seizures Because of potential for more severe side effects, this drug is on the list to avoid in the elderly. In many countries (including the US and UK),<unk>  is contraindicated in children less than two years of age, and strongly cautioned against in children between two and six, due to problems with respiratory depression and sleep apnea.<unk>  is listed as one of the drugs of highest anticholinergic activity in a study of anticholinergenic burden, including long-term cognitive impairment.
Promethazine
Naltrexone
Phenelzine
Chloracyzine
Medazepam
Hydroxyzine
Nabilone
Nordazepam