'self-prescribed' originates from the combination of 'self,' meaning 'by oneself,' and 'prescribe,' which comes from Latin 'praescribere,' meaning 'to write before.'

'prescribe' changed from the Latin word 'praescribere' and eventually became the modern English word 'prescribe.'

Initially, 'prescribe' meant 'to write before,' but over time it evolved into its current meaning of 'to authorize the use of a medicine or treatment.'