Coal Tar

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A petroleum by-product sometimes used to treat psoriasis. Exactly how it works, however, is unclear.

Coal Tar (Wikipedia)

Coal tar is a brown or black liquid of extremely high viscosity. Coal tar is among the by-products when coal is carbonized to make coke or gasified to make coal gas. Coal tars are complex and variable mixtures of phenols, polycyclic aromatic hydrocarbons (PAHs), and heterocyclic compounds.

It is on the WHO Model List of Essential Medicines, the most important medications needed in a basic health system.

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