Wikipedia has an article on BC Powder here

BC Powder is an over-the-counter pain relief medicine.

Hank Hill uses BC Powder to treat his headaches, and needed some after an irritating conversation with Anthony from Arlen County Child Protective Services ("Pilot".) He also states in Jumpin' Crack Bass (It's a Gas, Gas, Gas) that it is the strongest drug he'll take, when speaking with his lawyer.

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