Tiamulin hydrogen fumarate is a semisynthetic derivative of pleuromutilin. It exhibits activity against gram-positive bacteria, mycoplasmas, and anaerobes, including Brachyspira hyodysenteriae 1. Here are some important points about tiamulin hydrogen fumarate:

• Uses: It is labeled for use as an oral medicated feed or water in swine in the US to treat swine dysentery and Actinobacillus pleuropneumoniae