Maximum Permissible Amount of Preservatives and Antioxidants
| Excipient | Maximum Limit in USP |
|---|---|
| Mercurial compounds | 0.01% |
| Cationic surfactants | 0.01% |
| Chlorobutanol | 0.50% |
| Cresol | 0.50% |
| Phenol | 0.50% |
| Sulfur dioxide or an equivalent amount of the sulfite, bisulfite, or metabisulfite of potassium or sodium | 0.20% |