Tamsulosin who produces it?

Tamsulosin is produced by many pharmaceutical companies. There isn’t a single manufacturer. The brand name Flomax was originally marketed by Boehringer Ingelheim in some markets, but today there are numerous generic versions made by various manufacturers around the world.

If you tell me your country (and whether you want brand or generic), I can name common manufacturers that sell tamsulosin there. Also, the exact manufacturer should be listed on your medication bottle or package insert.