| Not official USP-NF text | ||||
| TRIHEXYPHENIDYL HYDROCHLORIDE | ||||
| PF | LGS# | Brand | Type of Test | Additional Information |
| 6(4) | G1 | None Cited | Assay | 3% |
| 16(4) | L1 | Pecosphere 3x8CR C18 | Assay | 3-µm, 8-cm |
| 6(4) | S1 | None Cited | Assay | Reprinted 7(2) |
| 7(4) | S1AB | None Cited | Assay | Reprinted 13(3), 14(5) |
| 7(4) | G1 | None Cited | Assay | 3% |
| 11(5) | S1AB | None Cited | Identity | See Assay |
| 11(5) | G1 | None Cited | Identity | See Assay |
| 18(3) | G43 | None Cited | Organic volat. impurities | See Method IV  467 |