How does Ibuprofen know where to go in your body?

Ibuprofen is a Non-Steroidal Anti-Inflammatory Drug (NSAID). Once swallowed the drug is absorbed through the intestines. The drug circulates through the blood stream through the entire body.

Ibuprofen then binds to an enzyme (COX) which prevents the conversion of a hormone (Prostaglandin H2). Prostaglandin H2 is responsible for pain, inflammation and related effects.

Ibuprofen does not knowspecificallyWHERE to go, but WHAT to bind to.