Antipsoriatics are a broad group of medications that can treat psoriasis and psoriatic arthritis, among other conditions. These medications work by slowing down the growth of skin cells and reducing inflammation, which helps to clear up the skin and relieve symptoms. Antipsoriatics come in different forms, including topical shampoos and injectable solutions. Examples include anthralin (Zithranol) and medications that double-dip into different drug classes, such as interleukin antagonists.