- Calcitriol
- Calcium Acetate
- Calcium Carbonate
- Candesartan
- Captopril
- Carbamazepine
- Carbimazole
- Carvedilol
- Caspofungin
- Cefadroxil
- Cefazolin
- Cefepime
- Cefidinir
- Cefixime
- Cefoperazone
- Cefotaxim
- Ceftazidime
- Ceftriaxone
- Cefuroxime
- Celecoxib
- Cephalexin
- Cetirizine
- Chlordiazepoxide
- Chlorpheniramine
- Chlorpromazine
- Cholestyramine
- Ciclosporin
- Cilostazol
- Cimetidine
- Cinnarizine