The main ingredient of Euthyroxel is hydrocortisone butyrate, a weak corticosteroid ointment with anti-inflammatory, anti-allergic, antipruritic and exudation reducing effects when applied topically. It is mainly used clinically for the treatment of diseases caused by allergy, such as acute and chronic urticaria, allergic dermatitis, drug rash, eczema, etc. It is also used for itching caused by non-allergic diseases, such as psoriasis vulgaris, seborrheic dermatitis, neurodermatitis, pruritus senileis, etc.. Long-term application may cause side effects such as local atrophy, capillary dilation, pigmentation, etc. Infectious skin diseases are prohibited.