Some FDA regulated products are intended to be used together to achieve their therapeutic or diagnostic effect but do not meet the regulatory definition of a combination product, This can be the case for medical products intended to be used together, for example, syringes marketed for general delivery of unspecified drugs or two or more of the same type of medical product (., a drug and drug, or device and device) that are packaged or labeled for use with one another (., fixed dose combination drugs under 21 CFR ). Similarly, combinations of a medical product with a non-medical product, for example a drug with a dietary supplement, cosmetic, or food, are not combination products.
Glucocorticoids are potent anti-inflammatories, regardless of the inflammation's cause; their primary anti-inflammatory mechanism is lipocortin-1 (annexin-1) synthesis. Lipocortin-1 both suppresses phospholipase A2 , thereby blocking eicosanoid production, and inhibits various leukocyte inflammatory events ( epithelial adhesion , emigration , chemotaxis , phagocytosis , respiratory burst , etc.). In other words, glucocorticoids not only suppress immune response, but also inhibit the two main products of inflammation, prostaglandins and leukotrienes . They inhibit prostaglandin synthesis at the level of phospholipase A2 as well as at the level of cyclooxygenase /PGE isomerase (COX-1 and COX-2),  the latter effect being much like that of NSAIDs , potentiating the anti-inflammatory effect.
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