Psoriderm emulsion 40% w/v bath additive is indicated for use topically as an aid in the treatment of sub-acute and chronic psoriasis. Coal tar has been used dermatologically for hundreds of years and has been shown to be safe and effective in the treatment of scaly skin conditions such as psoriasis. The coal tar used in Psoriderm Bath Additive has been specially distilled and is based on a neutral fraction which has been shown to be effective in the treatment of psorias