Chloramphenicol was first isolated in 1947 from the cultures of Streptomyces venezuelae. Chloramphenicol was synthesized in 1949, becoming the first completely synthetic antibiotic of importance to be produced commercially. Chloramphenicol is a broad spectrum antibiotic. Chloramphenicol is a nitrobenzene derivative. Chloramphenicol is primarily bacteriostatic and may be bacteriocidal to some strains. Chloramphenicol is active against both aerobic and anaerobic gram positive and gram negative organisms, rickettsiae and certain spirochetes. Adminitered orally or applied topically. Antibiotics require constant drug level in body for therapeutic effect. This is achieved by taking the drug at regular interval of time throughout the day and night as prescribed. Chloramphenicol is important to take the drug for the full time period as prescribed. If you discontinue the drug Chloramphenicol may result in ineffective treatment.