Bottles of "Terramycin" and propylene glycol, with contents and teat-pipette and instructions in original carton, by Pfizer Ltd., English, c. 1965.

After the discovery of penicillin, other antibiotics were developed. These were generally based on chemicals produced by micro-organisms – like the mould which produced penicillin. In 1949, the drug company Pfizer developed ‘Terramycin’, a brand name for the multipurpose antibiotic whose later generic name was ‘Oxytetracycline’.