| Nazwa handlowa | Nazwa międzynarodowa |
| Cetriscabin | BENZYLI BENZOAS + CE |
| Chinidinum prolongat | CHINIDINI SULFAS |
| Chinidinum sulfuricu | CHINIDINI SULFAS |
| Chlorpropamid | CHLORPROPAMIDUM |
| Chlorprothixen | CHLORPROTHIXENI HYDR |
| Cholamid | NICOTINYL METHYLAMID |
| Cholestil | HYMECROMONUM |
| Cifran 250 | CIPROFLOXACINUM |
| Cifran 500 | CIPROFLOXACINUM |
| Cilest | ETHINYLESTRADIOLUM + |
| Cimetidine | CIMETIDINUM |
| Cimetidinum | CIMETIDINUM |
| Cincol | NAPHAZOLINI NITRAS + |
| Cinnarizinum | CINNARIZINUM |
| Ciprinol | CIPROFLOXACINUM |
| Ciprobay | CIPROFLOXACINUM |
| Cipropol | CIPROFLOXACINUM |
| Cisap | CISAPRIDUM |
| Citrolyt | ACIDUM CITRICUM + KA |
| Claforan | CEFOTAXIMUM |
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