Can cause dizziness
weakness and unsteadiness
drowsiness
memory loss
confusion
disorientation
depression
emotional state
suicidal thought/attempt
incoordination
weakness
convulsions/seizures
tremor
fainting
visual disturbances
slurred speech
change in libido
impotence
headache
respiratory depression and worsening of obstructive pulmonary disease
nausea
change in appetite
constipation and jaundice.