Can cause drowsiness
weakness
headache
hostility
fatigue
nervousness
dizziness
personality disorder
irritability
agitation
emotional liability
depression
mood swings
vertigo
anxiety
unsteadiness
seizures
memory loss
confusion
increased reflexes
tingling
aggression and suicidal behavior
inflammation of nasopharynx
stuffy nose
inflammation of conjunctiva
blurred vision
double vision and ear pain
vomiting
loss of appetite
diarrhea
nausea
gastroenteritis
constipation and inflammation of pancreas
easy bruising
deficiency of all three blood cell types (with bone marrow suppression in some cases)
abnormal LFTs (liver function test)
liver failure and inflammation
dehydration and weight loss
neck pain
increased cough
asthma and sinusitis.