Can cause constipation
nausea
headache
diarrhea
vomiting
stomach upset
loss of appetite
gas
tremor
or trouble sleeping
gingival hyperplasia
persistent sore throat/fever
night sweats
flu-like symptoms
painful urination
vision changes
a sore or wound on the skin that feels warm/tender/painful and appears reddened
confusion
difficulty concentrating
difficulty moving muscles
seizure
difficulty speaking and allergic reactions.