Gerta Injection may also be used to prevent surgical site infections following surgery. It has shown to be effective in complicated diabetic foot infections as well. It is a broad-spectrum antibiotic that kills many types of gram-positive, gram-negative and other bacteria. This medicine is given by drip or by direct injection into a vein, under the supervision of a healthcare professional. The duration of treatment for most infection types is usually short-term and is determined by the doctor based on the site and severity of the infection.