Topical Corticosteroid Potency Guide for Pharmacy Technicians
Master the topical corticosteroid potency classification system, from super-high to low potency, for PTCB exam preparation.
Understanding Topical Corticosteroid Potency
Topical corticosteroids are classified into seven potency groups, with Group I being the most potent and Group VII being the least. Pharmacy technicians should understand this classification system because it affects product selection, dispensing, and patient counseling support.
Potency Classifications
Super-High Potency (Group I)
Clobetasol propionate 0.05% (Temovate) and betamethasone dipropionate 0.05% augmented (Diprolene) are the strongest available. These are reserved for thick, resistant plaques and are limited to short treatment courses of two weeks or less.
High Potency (Groups II-III)
Fluocinonide 0.05% (Lidex) and desoximetasone 0.25% fall in this range. They are used for moderate to severe dermatoses on the body but should be avoided on the face and skin folds.
Medium Potency (Groups IV-V)
Triamcinolone acetonide 0.1% (Kenalog) is one of the most commonly prescribed topical steroids. It is appropriate for many inflammatory skin conditions on the trunk and extremities.
Low Potency (Groups VI-VII)
- Hydrocortisone 1% and 2.5% (available OTC and Rx)
- Desonide 0.05% (DesOwen)
- Safe for face, groin, and pediatric use
Dispensing Considerations
Vehicle matters: ointments are generally more potent than creams of the same concentration because they enhance skin penetration. Technicians should verify that the correct formulation is dispensed, as creams, ointments, gels, and solutions are not interchangeable.
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