Children: Betamethasone belongs to the family of medications known as corticosteroids. Children may be more likely to experience side effects (e.g., slowing down of growth, delayed weight gain), especially if large amounts of this medication are used for long periods of time. The use of this medication by children should be limited to the smallest amount that will be effective for the shortest period of time. Discuss the risks and benefits of the use of this medication by children with your doctor.. Each gram contains betamethasone as betamethasone 17-valerate 0.05% in a water washable aqueous base. Nonmedicinal ingredients: ceteareth-15, cetyl alcohol, chlorocresol, mineral oil, phosphoric acid, polyethylene glycol 1000, propylene glycol, purified water, sodium hydroxide, stearyl alcohol, and white petrolatum.. Betaderm Ointment 0.05% is a medicated ointment that rarely causes adverse side effects. It is a safe and effective means of reducing the itchiness and inflammation that occurs with most skin conditions, such as dermatitis, psoriasis, and eczema. Its active ingredient, generic Betamethasone, acts in the same way cortisol does – by slowing your immune system. This causes a decrease in the .