Fusidic acid is an oral antistaphylococcal antibiotic that has been used in Europe for more than 40 years to treat skin infections as well as chronic bone and joint infections. It is a steroidal antibiotic and the only marketed member of the ... Find out how fusidic acid cream can help treat skin infections. Learn about its uses, price, potential side effects and how to use it effectively. Fusidic acid is used to treat infections caused by some bacteria, such as MRSA and leprosy. It is available as a cream, ointment, eyedrop, tablet or injection, and may have side effects such as liver damage. Fusidic acid is a medicine that kills bacteria and treats skin and hair infections like impetigo and folliculitis. It is for external use only and may cause side effects like skin rash, blistering and irritation.