| Not official USP-NF text | ||||
| GUAIFENESIN | ||||
| PF | LGS# | Brand | Type of Test | Additional Information |
| 23(4) | L1 | Nucleosil C18 | Assay & Chrom. purity | 4.6 mm x 25 cm, 5 µm. |
| 16(3) | G27 | None Cited | Organic volat. impurities | See Method I  467 |
| 18(2) | G43 | None Cited | Organic volat. impurities | See Method IV 467 |
| 17(6) | G43 | None Cited | Organic volat. impurities | See Method V 467 |
| 16(6) | L11 | ZORBAX Phenyl | Related substances | 15-cm |