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Carbidopa
| ITEMS | LIMIT |
| APPEARANCE | A WHITE OR YELLOWISH-WHITE POWDER |
| IDENTIFICATION | IR: CONFORM WITH SPECTRUM OF USP CARBIDOPA REFERENCE STANDARD |
| UV: CONFORM WITH THE RETENTION TIME OF THE MAJOR PEAK IN THE CHROMATOGRAM | |
| SPECIFIC ROTATION | -21.0º TO -23.5 º, CALCULATED AS THE MONOHYDRATE |
| LOSS ON DRYING | 6.9% TO 7.9% |
| RESIDUE ON IGNITION | ≤0.1% |
| HEAVY METAL | ≤0.001% |
| LIMIT OF METHYLDOPA | METHYLDOPA ≤0.50% |
| AND CARBIDOPA RELATED COMPONENTS A | CARBIDOPA RELATED COMPONENTS A ≤0.50% |
| ANY UNKNOWN IMPURITY≤0.10% | |
| ASSAY | 98.0% TO 102.0% |
| RESIDUAL SOLVENTS | DICHLOROMETHANE≤0.01% |
| ETHANOL≤0.10% |
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