| Ceclor (See'-klor) | Cefaclor (Sef'-a-klor) |
| Chlor-trimeton (Klor-try'-meh-ton) | Chlorpheniramine (Klor-fen-air'-a-meen) |
| Clinoril (Klo'-o-ril) | Sulindac ( sul'-in-dak) |
| Clomid (Klo'-mid) | Clomiphene (klo'-meh-feen) |
| Codeine (Ko'-deen) | Same |
| Cogentin (Ko-jen'-tin) | Benztropine (Benz-tro'-peen) |
| Colace ( Ko-lace) | Docusate sodium (Dok'-u-sate) |
| Colchicine (Kol'-cheh-seen) | same |
| Compazine (Komp'-a-zeen) | Prochlorperazine (Pro-klor-per'-a-zeen) |
| Coumadin (Koo'-ma-din) | Warfarin (War'-fah-rin) |
| CP | Chloroquine and primaquine ( klor'-o-quin and prim'-a-quin) |
| Cyclogyl (si'-ko-jel) | Cycopentolate (si-klo-pen'-toe-late) |
| Cylert (si-lert) | Pemoline (pem'-o-leen) |
| Cytomel (si'-toe-mel) | Liothyromine ( Lie-o-thy'-ro-neen) |
| Cytoxan (si-toks'-in) | Cyclophosphamide (si-klo-fos'-fa-mide) |