Chloramphenicol ReadyMadeTM Solution is a sterile solution of Chloramphenicol dissolved in ethanol at a concentration of 50 mg/ml. Chloramphenicol is a broad-spectrum bacteriostatic antimicrobial that inhibits bacterial protein synthesis. It is a synthetic antibiotic that was originally derived from Streptomyces venezuelae. Chloramphenicol is effective against a wide variety of Gram-positive and Gram-negative bacteria including most anaerobic organisms.