| Term | Definition |
| EES | erythromycin ethyl succinate |
| EC-Naprosyn | naproxen |
| Edecrin | ethacrynic acid |
| Edluar | zolpidem SL |
| Effexor | venlafaxine |
| Effient | prasugrel |
| Elavil | amitriptyline |
| Eldepryl | selegiline |
| Eliphos | calcium acetate |
| Elmitron | pentosan polysulfate sodium |
| Embeda | morphine sulfate/naltexone |
| Emcyt | estramustine |
| Emend | aprepitant |
| Emtriva | emtricitabine |
| Enablex | darifenacin |
| Endocet | oxycodone/APAP |
| Enjuvia | conjugated synthetic estrogens B |
| Entereg | alvimopan |
| Entocort EC | budesonide |
| Epivir | lamivudine |
| Epzicom | abacavir/lamivudine |
| Equetro | carbamazapine |
| Ery-Tab | erythromycin base (Ery-Tab) |
| Eryc | erythromycin base (Eryc) |
| Erythrocin | erythromycin stearate |
| Esgic | butalbital/caffeine/APAP 50/40/325 |
| Esgic-Plus | butalbital/caffeine/APAP 50/40/500 |
| Esidrix | HCTZ |
| Eskalith | lithium |
| Estrace | estradiol |
| Estratest | esterified estrogens/mehtyltestosterone |
| Evista | raloxifene |
| Evoxac | cevimeline |
| Exelon | rivastigmine |
| Exforge | amlodipine/valsartan |
| Exforge HCT | amlodipine/valsartan/HCTZ |
| Exjade | deferasirox |