A case of persistent aphagia in frontal lobe syndrome after traumatic brain injury (TBI) with successful use of olanzapine to improve the eating disorder is presented. A 20-year-old man suffered a severe TBI with right frontal intracerebral haemorrhage At four-month post-TBI, he had agitation, concurrent apathy with constant refusal for oral swallow despite gustatory sensory stimulation, hence the needs for nasogastric tube (NGT) feeding. He was diagnosed with frontal lobe syndrome and prescribed olanzapine 5mg daily that was optimised to 10mg due to worsened aggression. One month later, the aggression reduced with gradual improvement in oral intake. Percutaneous enterogastrostomy (PEG) tube insertion was cancelled and the NGT was sucessfully removed. Olanzapine prescription in this case improved aggression and aphagia simultaneously. Although olanzapine is proven beneficial and surgical intervention for long-term enteral feeding was avoided in this case, its usage requires judicious judgement.