Soluble powder antibiotic formulated with kitasamycin, a broad-spectrum macrolide effective against Gram-positive bacteria, some Gram-negative bacteria, and atypical microorganisms such as Mycoplasma spp. Its good solubility and stability allow for administration in drinking water or mixed in feed. Its use is indicated for poultry and swine, under professional guidance and with the rational use of antibiotics, in situations that require the use of this active ingredient as an antibiotic.