| Drug Name | Trademark Name |
| 1,25 dihydroxycholecalciferol | 1,25 dihydroxycholecalciferol |
| 131 I anti-B1 antibody | 131 I anti-B1 antibody |
| 131 I-anti-B1 monoclonal antibody | 131 I-anti-B1 monoclonal antibody |
| 1370-999-397 | 1370-999-397 |
| 13-cis-retinoic acid | 13-cis-retinoic acid |
| 1a-hydroxyergocalciferol | 1α-hydroxyergocalciferol |
| 1-Day [US-OTC] | 1-Day [US-OTC] |
| 1-deamino-8-D-arginine vasopressin | 1-deamino-8-D-arginine vasopressin |
| 23PS | 23PS |
| 23-valent pneumococcal polysaccharide vaccine | 23-valent pneumococcal polysaccharide vaccine |
| 292 MEP [Can] | 292 MEP® [Can] |
| 2-amino-6-mercaptopurine | 2-amino-6-mercaptopurine |
| 2-amino-6-trifluoromethoxy-benzothiazole | 2-amino-6-trifluoromethoxy-benzothiazole |
| 2-CdA | 2-CdA |
| 2-chlorodeoxyadenosine | 2-chlorodeoxyadenosine |
| 2'-deoxycoformycin | 2′-deoxycoformycin |
| 2-PAM | 2-PAM |
| 2-propylpentanoic acid | 2-propylpentanoic acid |
| 2-propylvaleric acid | 2-propylvaleric acid |
| 2-pyridine aldoxime methochloride | 2-pyridine aldoxime methochloride |
| 311C90 | 311C90 |
| 3M Avagard (Discontinued) | 3M Avagard <B>(Discontinued)</B> |
| 3M Cavilon Skin Cleanser [US-OTC] | 3M Cavilon Skin Cleanser [US-OTC] |
| 3TC | 3TC |
| 3TC [Can] | 3TC® [Can] |
| 3TC, abacavir, and zidovudine | 3TC, abacavir, and zidovudine |
| 40 Winks (Discontinued) | 40 Winks® <B>(Discontinued)</B> |
| 4-demethoxydaunorubicin | 4-demethoxydaunorubicin |
| 4-DMDR | 4-DMDR |
| 4-hydroxybutyrate | 4-hydroxybutyrate |
| 4-methylpyrazole | 4-methylpyrazole |
| 4-MP | 4-MP |
| 4'-nitro-3'-trifluoromethylisobutyrantide | 4′-nitro-3′-trifluoromethylisobutyrantide |
| 4-Way Long Acting [US-OTC] | 4-Way® Long Acting [US-OTC] |
| 5071-1DL(6) | 5071-1DL(6) |
| 5-aminosalicylic acid | 5-aminosalicylic acid |
| 5-ASA | 5-ASA |
| 5-azacytidine | 5-azacytidine |
| 5-AZC | 5-AZC |
| 5-FC | 5-FC |
| 5-fluorouracil | 5-fluorouracil |
| 5-flurocytosine | 5-flurocytosine |
| 5-formyl tetrahydrofolate | 5-formyl tetrahydrofolate |
| 5-FU | 5-FU |
| 5-FUDR | 5-FUDR |
| 6,7-dichloro-1,5-dihydroimidazo [2,1b] quinazolin-2(3H)-one monohydrochloride | 6,7-dichloro-1,5-dihydroimidazo [2,1b] quinazolin-2(3H)-one monohydrochloride |
| 642 Tablet [Can] | 642® Tablet [Can] |
| 6-a-methylprednisolone | 6-α-methylprednisolone |
| 6-mercaptopurine | 6-mercaptopurine |
| 6-MP | 6-MP |
| 6-TG | 6-TG |
| 6-thioguanine | 6-thioguanine |
| 7E3 | 7E3 |
| 8-arginine vasopressin | 8-arginine vasopressin |
| 8-methoxypsoralen | 8-methoxypsoralen |
| 8-MOP [US/Can] | 8-MOP® [US/Can] |
| 9a-fluorohydrocortisone acetate | 9α-fluorohydrocortisone acetate |
| 9-beta-d-ribofuranosyladenine | 9-beta-d-ribofuranosyladenine |