Postural hypotension, resp depression, hepatotoxicity, Stevens-Johnson syndrome, toxic epidermal necrolysis, bradycardia, collapse, allergic reactions w/ resp symptoms (e.g. dyspnoea, bronchospasm, wheezing, angioneurotic oedema), changes in appetite, motor weakness, changes in mood, activity, cognitive and sensorial capacity; exacerbation of asthma, withdrawal symptoms (e.g. agitation, anxiety), skin rash, blood dyscrasias, hypoprothrombinemia.
Potentially Fatal: Severe anaphylactic reactions.