"Tetanic" is a word in ENGLISH

Of or pertaining to tetanus; having the character of
tetanus; as, a tetanic state; tetanic contraction.

Producing, or tending to produce, tetanus, or tonic
contraction of the muscles; as, a tetanic remedy. See Tetanic, n.

A substance (notably nux vomica, strychnine, and brucine)
which, either as a remedy or a poison, acts primarily on the spinal
cord, and which, when taken in comparatively large quantity, produces
tetanic spasms or convulsions.