Psoriderm cream contains two active ingredients, distilled coal tar and lecithin.
Coal tar has been used to treat skin disorders for hundreds of years, but its method of action is still unknown, owing to its complex composition.
Coal tar possesses mild antibacterial and anti-inflammatory properties, as well as the ability to reduce itching. It is also absorbed by skin cells, where it is thought to inhibit DNA replication. This slows cell division and prevents excessive cell proliferation. This, in turn, lowers skin thickness and scaling and clears psoriasis plaques.