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Coal tar

Medication
Coal tar is a thick dark liquid which is a by-product of the production of coke and coal gas from coal. It is a type of creosote. It has both medical and industrial uses. Medicinally it is a topical medication applied to skin to treat psoriasis... Wikipedia
AHFS/Drugs.com: Multum Consumer Information
ATC code: D05AA (WHO)
Other names: liquor carbonis detergens (LCD); liquor picis carbonis (LPC)
Routes of administration: Topical