| L | ||
| Labetalol HCI | Normodyne, Trandate | |
| Lactobacillus | Bacid, Lactinex | |
| Lactulose Syrup | Chronulac, Cephulac | |
| Leucovorin Calcium | Wellcovorin | |
| Leuprolide Acetate | Lupron | |
| Levamisole HCI | Ergamisol | |
| Levarterenol | Levophed | |
| Levocabastine HCI | Livostin | |
| Levodopa | Dopar, Larodopa | |
| Levorphanof Tartrate | Levo-Dromoran | |
| Levothyroxine Sodium | Synthroid, Levothroid | |
| Lidocaine HC1 | Xylocaine, Nervocaine | |
| Lincomycin | Lincocin | |
| Lindane | Kwell | |
| Liothyronine Sodium | Cytornel, Triostat | |
| Liotrix | Euthroid, Thyrolar | |
| Lisinopril | Prinivil, Zestril | |
| Lisinopril & Hydrochlorothiazide | Prinzide | |
| Lithium Carbonate | Lithane, Lithobid, Eskalith | |
| Lodoxamide Tromethamine | Alomide | |
| Lomefloxacin HCI | Maxaquin | |
| Lornustine | Cee Nu | |
| Loperamide HCI | Imodium | |
| Loracarbef | Lorabid | |
| Loratadine | Claritin | |
| Lorazepam | Ativan | |
| Lovastatin | Mevacor | |
| Loxapine Succinate | Loxitane | |
| Lypressin | Diapid |