Can cause peripheral neuritis
psychotic reactions
convulsions
optic neuritis
transient increases in liver enzymes
haematological effects (e.g. anaemias
agranulocytosis
thrombocytopenia
eosinophilia)
hypersensitivity reactions include skin eruptions (including erythema multiforme)
fever
vasculitis; nausea
vomiting
dry mouth
constipation
pellagra
purpura
hyperglycaemia
lupus-like syndrome
vertigo
hyperreflexia
urinary retention and gynaecomastia.
Potentially Fatal: Hepatitis.