Hydrochlorothiazide (HCTZ) and its salts, formulated as diuretics and put up in measured doses or retail packaging, are regulated at the US border by FDA under its drug admissibility framework, requiring evidence of approved manufacturing and proper labeling. HCTZ is one of the most widely prescribed thiazide diuretics, used primarily for hypertension and edema management, making this a commercially significant pharmaceutical import line. Importers must ensure the foreign establishment is FDA-registered and that each shipment meets Current Good Manufacturing Practice (cGMP) standards. Classification at this 10-digit level is sensitive to formulation — products combining HCTZ with other active ingredients may fall under different tariff lines.

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