'spasmogenic' originates from Greek roots: 'spasm(o)-' from Greek 'spasmos' meaning 'a convulsion, spasm', combined with the suffix '-genic' from Greek 'genēs' meaning 'producing' or 'originating'.

'spasmogenic' was formed in modern scientific/medical English by combining 'spasm' (from Greek 'spasmos' via Late Latin/modern usage) and the suffix '-genic' (from Greek), producing a technical adjective meaning 'producing spasms'.

Initially coined to denote 'producing or causing spasms' in medical contexts, its meaning has remained essentially the same: 'causing spasms or convulsions'.