USP Powdered Echinacea angustifolia Extract RS— Do not dry. Keep container tightly closed. Protect from light.

USP Powdered Echinacea pallida Extract RS.

USP Powdered Echinacea purpurea Extract RS— Do not dry. Keep container tightly closed. Protect from light.

USP Econazole Nitrate RS— Do not dry. Keep container tightly closed. Protect from light.

USP Edetate Calcium Disodium RS— Do not dry before using. This material is hygroscopic. Keep container tightly closed. Store in a refrigerator.

USP Edetate Disodium RS— Do not dry. Keep container tightly closed.

USP Edetic Acid RS— Do not dry before using. Keep container tightly closed.

USP Edrophonium Chloride RS— Dry portion in vacuum over phosphorus pentoxide for 3 hours before using. Keep container tightly closed.

USP Powdered Eleuthero Extract RS— Do not dry. For quantitative applications, determine the water content titrimetrically at the time of use. Store in a refrigerator. This material is hygroscopic.

USP Emedastine Difumarate RS— Dry portion at 105 for 3 hours before using. Keep container tightly closed.

USP Emetine Hydrochloride RS— Do not dry before quantitative use. Determine volatiles content by heating a separate portion at 105 to constant weight to determine correction factor for quantitative use. Keep container tightly closed and protected from light.

USP Enalapril Maleate RS— Do not dry. Keep container tightly closed.

USP Enalaprilat RS— Do not dry; determine the water content titrimetrically at time of use for quantitative analyses. Sonicate as necessary to effect solution. Keep container tightly closed.

USP Endotoxin RS— [Caution—Contents are pyrogenic. Handle vials and their contents with extreme care to avoid contamination. ] Reconstitute entire contents; use solution within 14 days. Store unopened vial and solution in a refrigerator.

USP Enflurane RS— Do not dry. After opening ampul, store in a tightly closed, light-resistant container. Avoid exposure to excessive heat.

USP Ensulizole RS [phenylbenzimidazole sulfonic acid]— Dry portion at 105 for 4 hours before using. Keep container tightly closed.

USP Enzacamene RS.

USP Ephedrine Sulfate RS— Dry portion at 105 for 3 hours before using. Keep container tightly closed. Protect from light.

USP 4-Epianhydrotetracycline Hydrochloride RS— Dry portion in vacuum at 60 for 3 hours before using. The dried material is extremely hygroscopic. Keep container tightly closed. Protect from light. Store in a cold, dry place.

USP Epilactose RS— Dry portion at 70 for 4 hours before using. Keep container tightly closed.

USP Epinephrine Bitartrate RS— Dry portion in vacuum over silica gel for 3 hours before using. Keep container tightly closed. Protect from light.

USP Equilin RS— Do not dry before using. Keep container tightly closed. Protect from light. Store in a cold place.

USP Ergocalciferol RS— Store in a cold place, protected from light. Allow it to attain room temperature before opening ampul. Use the material promptly, and discard the unused portion.

USP Ergoloid Mesylates RS— Do not dry; determine the water content titrimetrically at time of use. Keep container tightly closed. Protect from light.

USP Ergonovine Maleate RS— Dry portion in vacuum at 80 for 3 hours before using. Keep container tightly closed. Protect from light.

USP Ergosterol RS (C28H44O 396.66) —Do not dry before using. Keep container tightly closed, keep protected from light and air, and store in a refrigerator. Allow to equilibrate to room temperature before opening container.

USP Ergotamine Tartrate RS— Dry portion in vacuum at 60 for 4 hours before using. Keep container tightly closed. Protect from light. Store in a cold place.

USP Ergotaminine RS— Do not dry; use as is. Keep container tightly closed. Protect from light. Store in a cold place.

USP Erythromycin RS— Do not dry before using, unless otherwise specified. Allow to equilibrate to ambient temperature before opening ampul. Hygroscopic. After opening, weigh portions immediately, avoiding excessive humidity, and discard material remaining. Store unopened material in a freezer.

USP Erythromycin B RS— Do not dry before using. Keep container tightly closed and protected from light, and store in a freezer.

USP Erythromycin C RS— Do not dry before using. Keep container tightly closed and protected from light, and store in a freezer.

USP Erythromycin Related Compound N RS [N-demethylerythromycin A] (C36H65NO13 719.91) —Do not dry before using. Keep container tightly closed, protected from light, and store in a freezer.

USP Erythromycin Estolate RS— Do not dry before using. Keep container tightly closed. Protect from light. Store in a cold place.

USP Erythromycin Ethylsuccinate RS— Do not dry before using. Keep container tightly closed. Protect from light. Store in a cold place.

USP Erythromycin Gluceptate RS— Do not dry before using. Keep container tightly closed. Store in a freezer.

USP Erythromycin Lactobionate RS— Dry portion in vacuum at a pressure not exceeding 5 mm of mercury at 60 for 3 hours before using. Keep container tightly closed. Store in a cold place.

USP Erythromycin Stearate RS— Do not dry before using. Keep container tightly closed. Protect from light. Store in a cold place.

USP Escin RS.

USP Estradiol RS— Do not dry; this is the hemihydrate form of estradiol. Determine the water content titrimetrically at time of use. Keep container tightly closed. Protect from light.

USP Estradiol Cypionate RS— Dry portion at 105 for 4 hours before using. Keep container tightly closed. Protect from light.

USP Estradiol Valerate RS— Do not dry; use as is. Keep container tightly closed. Protect from light. Store in a refrigerator.

USP Estriol RS— Dry portion at 105 for 3 hours before using. Keep container tightly closed. Protect from light.

USP Estrone RS— Dry portion at 105 for 3 hours before using. Keep container tightly closed. Protect from light.

USP Estropipate RS— Dry portion at 105 for 1 hour before using. Keep container tightly closed.

USP Ethacrynic Acid RS— Dry portion at a pressure not exceeding 5 mm of mercury at 60 for 2 hours before using. Keep container tightly closed. Store in a cool place.

USP Ethambutol Hydrochloride RS— Dry portion at 105 for 2 hours before using. Keep container tightly closed.

USP Ethchlorvynol RS.

USP Ethinyl Estradiol RS— Dry portion at 105 for 3 hours before using. Keep container tightly closed. Protect from light.

USP Ethionamide RS— Do not dry before using. Keep container tightly closed.

USP Ethopabate RS— Dry portion in vacuum at 60 for 2 hours before using. Keep container tightly closed, and store in a cool, dry place.

USP Ethopabate Related Compound A RS [methyl-4-acetamido-2-hydroxybenzoate] (C10H11NO4 209.20) —Do not dry before using. Keep container tightly closed, protected from light.

USP Ethosuximide RS— Do not dry. Keep container tightly closed.

USP Ethotoin RS— Do not dry before using. Keep container tightly closed.

USP Ethylcellulose RS— Do not dry before using. Keep container tightly closed.

USP Ethylparaben RS— Dry portion over silica gel for 5 hours before using. Keep container tightly closed.

USP Ethyl Vanillin RS— Dry portion over phosphorus pentoxide for 4 hours before using. Keep container tightly closed. Protect from light.

USP Ethynodiol Diacetate RS— Do not dry; use as is. Keep container tightly closed. Protect from light.

USP Etidronate Disodium RS— Do not dry before using. Keep container tightly closed, and store in a cool, dry place.

USP Etidronate Disodium Related Compound A RS [sodium phosphite dibasic pentahydrate] (Na2HPO3 · 5H2O 216.04 CAS-13708-85-5) —Do not dry.

USP Etidronic Acid Monohydrate RS (C2H8O7P2·H2O 224.04) —Do not dry before using. Keep container tightly closed, and store in a cool, dry place.

USP Etodolac RS— Do not dry before using; determine the water content titrimetrically at the time of use for quantitative analyses. Keep container tightly closed.

USP Etodolac Related Compound A RS [(±)-8-ethyl-1-methyl-1,3,4,9-tetrahydropyrano [3,4-b]-indole-1-acetic acid] (C16H19NO3 273.33) —Do not dry before using. Keep container tightly closed.

USP Etoposide RS— Do not dry before using. Determine the water content titrimetrically at the time of use. Keep container tightly closed and protected from light.

USP Etoposide Resolution Mixture RS —Do not dry before using. Keep container tightly closed and protected from light.

USP Eucatropine Hydrochloride RS— Dry portion over silica gel for 4 hours before using. Keep container tightly closed. Protect from light.