acronarcotic

from The Century Dictionary.

• Acting as an irritant and a narcotic.
• noun One of a class of poisons, chiefly of vegetable origin, which irritate and inflame the parts to which they are applied, and act on the brain and spinal cord, producing stupor, coma, paralysis, and convulsions. Also called narcotico-acrid or narcotico-irritant.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• adjective medicine Of a substance, both acrid and narcotic; irritant in local effect and narcotic in action upon the nerve centers.