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Chemical classification of most known LAs. Benzocaine does not have a pKa value as it only exists in the uncharged state.
| Name | Class | pKa |
|---|---|---|
| Cocaine | ester | 8.6 |
| Tropacocaine | ester | 9.3 |
| Benzocaine | ester | — |
| Procaine | ester | 8.9 |
| Tetracaine | ester | 8.5 |
| 2-chloroprocaine | ester | 8.7 |
| Dibucaine | ester | 8.8 |
| Lidocaine | amide | 7.6 |
| Mepivacaine | amide | 7.6 |
| Prilocaine | amide | 7.9 |
| Bupivacaine | amide | 8.1 |
| Etidocaine | amide | 7.7 |
| Ropivacaine | amide | 8.1 |
| Levobupivacaine | amide | 8.1 |
