四环素必须作成干燥粉,临用前配成溶液供肌肉注射,因此限制了此抗菌素只能大部分在医院条件下应用。最近曾发现氧四环素的铵基乙醇镁(Ethnolammonium mag-magnesium),当溶于含80%的丙二醇的水中,此溶液系以分子比例将四环素,镁盐及直链烃铵类在含丙二醇的水中反应而成。同时尚含有2%里多卡因及抗氧剂,并通入惰性气体。作者对此制剂进行了稳定性研究。在37℃及50℃下贮存三个月,结果经过三个月 Tetracycline must be made into a dry powder, immediately before use to form a solution for intramuscular injection, thus limiting the antibiotic can only be used under most hospital conditions. It has recently been found that oxytetracycline magnesium ethylate, which when dissolved in water containing 80% of propylene glycol, in the molecular ratio of tetracycline, magnesium salt, and straight-chain hydrocarbon ammonium in propylene glycol-containing water Reaction. At the same time still contains 2% lidocaine and antioxidants, and pass into the inert gas. The authors conducted a stability study of this preparation. Stored at 37 ° C and 50 ° C for three months, the result of three months