Not official USP-NF text
HYDROXYUREA
PF LGS# Brand Type of Test Additional Information
29(6) L1 Spherisorb ODS Assay 4.6 mm x 25 cm, 5 µm.
12(6) L1 Supelcosil LC-18 Assay 5-µm
16(4) G27 None Cited Organic volatile impurities See Method I 467