Betamethasone is available for topical, oral and injection use.

Oral

Allergic and inflammatory disorders
Adult: 0.5-5 mg daily.
Child: (≤12 yr): 0.0175-0.125 mg per kg body weight daily

Congenital adrenal hyperplasia
Adult: 0.5-5 mg daily.
Child: (≤12 yr): 0.0175-0.125 mg per kg body weight daily

Intramuscular

Allergic and inflammatory disorders
Adult: 0.25-9 mg daily may be given in once to two divided doses. Reduce dose gradually when an adequate response is achieved.
Child: (≤12 yr): 0.0175-0.125 mg per kg body weight daily

Ophthalmic

Allergic and inflammatory conditions of the eye
Adult: Apply a 0.1% solution every 1-2 hr until symptoms are controlled

Topical

Skin disorders
Adult: Apply 0.05% into affected area.