What company makes trazodone?

There isn’t a single company that makes trazodone. It’s a generic antidepressant produced by many manufacturers around the world. The drug was originally developed by the Italian company Angelini. In the U.S., it has been sold under the brand name Desyrel (and a long-acting version called Oleptro is marketed by Takeda). If you tell me your country or whether you want a brand-name product or a generic, I can give you more specific manufacturers.