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's lungs, Crohn's disease . How to use Betaderm Cream. Use this medication on the skin only. However, do not use it on the face, groin, or underarms unless directed to do so by your doctor.. BETADERM ointment 15 g BetadermOintment Ointment composition Drugs Betamethasone 0.5 mg / g (as Betamethasone dipropionate) Gentamicin 1.0 mg / g (as Gentamicin sulphate) Excipients: Liquid paraffin, lanolin alcohols, cetostearyl alcohol, butylated hydroxytoluene, butylated white Vaseline.. This medication contains a topical anti-inflammatory drug from the cortisone family (corticosteroid). Typically, it is used for inflammation and itching. It requires several days to take effect.. Learn about Betaderm from patients' first hand experiences and trusted online health resources, including dosage, side effects and interactions. 441 discussions on Treato - Page 2. Detailed information related to Betaderm G Cream's uses, composition, dosage, side effects and reviews is listed below..