Orthocaine is a

local anesthetic A local anesthetic (LA) is a medication that causes absence of pain sensation. In the context of surgery, a local anesthetic creates an absence of pain in a specific location of the body without a loss of consciousness, as opposed to a general an ...

. Developed in the 1890s, it was found to be of limited use due to its low solubility in water, but it has been used in powdered form to dust onto painful wounds.

References

Local anesthetics Benzoate esters Anilines Phenols {{nervous-system-drug-stub