The corticosteroids are a class of compounds comprising
steroid hormones secreted by the adrenal cortex and their synthetic analogs. In
pharmacologic doses, corticosteroids are used primarily for their
anti-inflammatory and/or immunosuppressive effects. Topical corticosteroids,
such as betamethasone dipropionate, are effective in the treatment of corticosteroid-responsive
dermatoses primarily because of their anti-inflammatory, antipruritic, and vasoconstrictive
actions. However, while the physiologic, pharmacologic, and clinical effects of
the corticosteroids are well known, the exact mechanisms of their actions in
each disease are uncertain. Betamethasone dipropionate, a corticosteroid, has
been shown to have topical (dermatologic) and systemic pharmacologic and
metabolic effects characteristic of this class of drugs.
Pharmacokinetics
The extent of percutaneous absorption of topical corticosteroids is determined
by many factors including the vehicle, the integrity of the epidermal barrier,
and the use of occlusive dressings. (See DOSAGE AND
ADMINISTRATION section).
Topical corticosteroids can be absorbed through normal intact skin. Inflammation
and/or other disease processes in the skin may increase percutaneous absorption.
Occlusive dressings substantially increase the percutaneous absorption of topical
corticosteroids. (See DOSAGE AND ADMINISTRATION
section.)
Once absorbed through the skin, topical corticosteroids
enter pharmacokinetic pathways similar to systemically administered
corticosteroids. Corticosteroids are bound to plasma proteins in varying degrees,
are metabolized primarily in the liver and excreted by the kidneys. Some of the
topical corticosteroids and their metabolites are also excreted into the bile.
Studies performed with DIPROLENE Lotion (betamethasone dipropionate) indicate that it is
in the super-high range of potency as compared with other topical
corticosteroids.
Last reviewed on RxList: 6/2/2009
This monograph has been modified to include the generic and brand name in many instances.