By API Standards
- Cabazitaxel
- Cabotegravir
- Caffeine
- Canagliflozin
- Candesartan
- Canrenone
- Carbamazepine
- Carbendazim
- Carbodenafil
- Cariprazine
- Carotene
- Carteolol
- Carvedilol
- Cefepime
- Cefuroxime
- Celecoxib
- Ceritinib
- Cetirizine
- Chidamide
- CHIR99021
- Chloramphenicol
- Chlordiazepoxide
- Chloroquine
- Chlorothiazide
- Chlorpromazine
- Chlorpropham
- Chlorthalidone
- Chlorzoxazone
- Cholecalciferol
- Cholesterol
- Cholic Acid
- Choline
- Cilostazol
- Cinacalcet
- Cinnarizine
- Ciprofibrate
- Ciprofloxacin
- Citalopram
- Citicoline
- Citronellyl
- Clenbuterol
- Clenproperol
- Clevidipine
- Clidinium Bromide
- Clobetasol
- Clofentezine
- Clomipramine
- Clonidine
- Clopidogrel
- Clopyralid
- Clorprenaline
- Clozapine
- Cortexolone
- Cortisol
- Coumarin
- Cresol
- Cridanimod
- Crocetin
- Curcumin
- Cyantraniliprole
- Cycloguanil
- Cyclosporin A
- Cypermethrin
- Cytisine