oxycontin

As a noun oxytocin

is (hormone) a hormone that stimulates contractions during labour/labor, and then the production of milk.

As a proper noun oxycontin is

a controlled-release form of the drug oxycodone.

As a noun tramadol

is a synthetic analgesic opiate used for the relief of pain.

As a proper noun oxycontin is

a controlled-release form of the drug oxycodone.

As a proper noun oxycontin

is a controlled-release form of the drug oxycodone.

As a noun oxymorphone is

(pharmaceutical drug) a particular narcotic painkiller.