| Gel formulation |
| Chitosan: FeEDTA VitC 5:1 (w/w%) | Aspirin (w/w%) | Ibuprofen (w/w%) | Naproxen (w/w%) | Tetracycline (w/w%) | pH |
| Chitosan-VitC (5:1) | Gel-1 | 5 | 0 | 0 | 0 | 0 | 6.84 |
| Chitosan-VitC-A1 | Gel-2 | 5 | 1 | 0 | 0 | 0 | 6.92 |
| Chitosan-VitC-N1 | Gel-3 | 5 | 0 | 0 | 1 | 0 | 6.75 |
| Chitosan-VitC-I1 | Gel-4 | 5 | 0 | 1 | 0 | 0 | 6.56 |
| Chitosan-VitC-T1 | Gel-5 | 5 | 0 | 0 | 0 | 1 | 6.26 |