Betamethasone is a steroid medication. It is used for a number of diseases including rheumatic disorders such as rheumatoid arthritis and systemic lupus erythematosus, skin diseases such as dermatitis and psoriasis, allergic conditions such as asthma and angioedema, preterm labor to speed the development of the baby, Crohn disease, cancers such as leukemia, and along with fludrocortisone for adrenocortical insufficiency, among others. It can be taken by mouth, injected into a muscle, or applied as a cream. When given by injection, anti-inflammatory effects begin in around two hours and last for seven days.

CAS：378-44-9
中文别名：16b-甲基-11b,17a,21-三羟基-9a-孕甾-1,4-二烯-3,20-二酮;9α-Fluoro-11β,17α,21-trihydroxy-16β-methylpregna-1,4-diene-3,20-dione;甲醇中倍他米松;Beta-美松;
英文别名：Bifas;Betnelan;9α-Fluoro-11β,17α,21-trihydroxy-16β-methyl-1,4-pregnadiene-3,20-dione;Becort;Bedifos;Pertene;Bebate;Cidoten;Betamethasone Solutiom;betamethazone;6beta);Betamethasone;Betalon;Betsolan;
分子式：C22H29FO5
分子量：392.461
精确质量：392.2
Psa：94.83
Logp：1.8957

UNII：9842X06Q6M

外观与性状：白色至灰白色结晶粉末
密度：1.32g/cm3
沸点：568.2ºC at 760mmHg
熔点：235-237°C
闪点：297.5ºC
折射率：118 ° (C=1, Dioxane)
储存条件：通风低温干燥

RTECS号：TU4000000
安全说明：S22; S36
危险类别码：R40
海关编码：2937229000
危险品标志：Xi; Xn

生产方法
按美国专利3164618,将醋酸倍他米松于甲醇-氯仿-水的混合物中以盐酸处理,可使其转换为倍他米松。 用于治疗活动性风湿病、类风湿性关节炎、红斑狼疮、严重支气管哮喘、严重皮炎、急性白血病等，也用于某些感染的综合治疗。
用途
用于治疗活动性风湿病、类风湿性关节炎、红斑狼疮、严重支气管哮喘、严重皮炎、急性白血病等，也用于某些感染的综合治疗。