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Betamethasone + dexchlorpheniramine is a combination pharmaceutical product consisting of a synthetic corticosteroid (betamethasone) and a first-generation antihistamine (dexchlorpheniramine). This combination, widely known by the brand name Celestamine, is utilized for its synergistic anti-inflammatory and antiallergic properties in treating severe respiratory, dermatological, and ocular allergic conditions. In the specific context of clinical trials sponsored by FutureChem for prostate cancer diagnostics, such as the PSMA-targeting PET tracer [F-18]Florastamin (FC303), this combination is often employed as a premedication or supportive care intervention to prevent or manage potential hypersensitivity reactions associated with the administration of radiopharmaceuticals. Betamethasone provides potent glucocorticoid activity to suppress immune responses, while dexchlorpheniramine acts as a competitive H1-receptor antagonist to alleviate histamine-mediated symptoms.
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