甲砜霉素，又名硫霉素、甲砜氯霉素或赛芬妥霉素，是一种酰胺醇类抗生素。它是氯霉素的甲基磺醘基相似体，有着相似的反应，强度却小2.5－5倍。与氯霉素相似，甲砜霉素不溶于水，但却极易溶于脂类。与氯霉素相比，甲砜霉素的主要优点是不会引起再生不良性贫血。

Thiamphenicol (also known as thiophenicol and dextrosulphenidol) is an antibiotic. It is the methyl-sulfonyl analogue of chloramphenicol and has a similar spectrum of activity, but is 2.5 to 5 times as potent. Like chloramphenicol, it is insoluble in water, but highly soluble in lipids. It is used in many countries as a veterinary antibiotic, but is available in China, Morocco and Italy for use in humans. Its main advantage over chloramphenicol is that it has never been associated with aplastic anaemia.