An antibiotic with Spirulina platensis and plant extracts is an antibiotic composition including a combination of Spirulina platensis, an essential oil of Magnolia officinalis, and an essential oil of mumie. In an embodiment, the antibiotic composition may be effective in treating Acinetobacter baumannii infections. In a further embodiment, the antibiotic composition may be effective in treating multidrug resistant (MDR) and/or extremely drug resistant (XDR) Acinetobacter baumannii infections. In an embodiment, the antibiotic composition may be administered to a subject in need thereof to treat or prevent an Acinetobacter baumannii infection, such as a MDR or XDR Acinetobacter baumannii infection.