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

USP Powdered Valerian RS.

USP L-Valine RS— Dry portion at 105 for 3 hours before using. Keep container tightly closed.

USP Valproic Acid RS— Do not dry. After opening ampul, store in a tightly closed container.

USP Valproic Acid Related Compound A RS [diallylacetic acid] (C8H12O2 140.18) . [WARNING! Reproductive Hazard, Causes Irritation.] Do not dry. After opening, store in a tightly closed container. Avoid contact. Store in a refrigerator.

USP Valrubicin RS— Dry in vacuum over phosphorus pentoxide at 80 for 4 hours before using.

USP Valrubicin Related Compound A RS [N-trifluoroacetyl-14-bromodaunorubicin-13,13-dimethylketal]— Dry in vacuum over phosphorus pentoxide at 80 for 4 hours before using.

USP Vancomycin Hydrochloride RS— Do not dry. Constitute the entire contents, without weighing, and rinsing as necessary, for assay. Keep unopened containers tightly closed. Protect from light. Store in a cold place.

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

USP Vanillin Melting Point RS— Do not dry. When melted by the USP capillary tube method, Class Ia in the general chapter Melting Range or Temperature 741, the observed range falls within the indicated acceptance range. Keep container tightly closed and protected from light.

USP Vasopressin RS.

USP Vecuronium Bromide RS— Dry portion in vacuum over phosphorus pentoxide for 3 hours before using. The material is very hygroscopic. Weigh under controlled humidity conditions less than 10% relative humidity. Keep container tightly closed. Store in a refrigerator.

USP Vecuronium Bromide Related Compound A RS [3,17-diacetyl-oxy-2,16-bispiperidinyl-5-androstan] (C33H54N2O4 542.79).

USP Vecuronium Bromide Related Compound B RS [piperidinium, 1-[(2,3,5,16,17)-3-acetyloxy-17-hydroxy-2-(1-piperidinyl)androstan-16-yl]-1-methyl bromide] (C32H55BrN2O3 595.69).

USP Vecuronium Bromide Related Compound C RS [piperidinium, 1-[(2,3,5,16,17)-3,17-dihydroxy-2-(1-piperidinyl)androstan-16-yl]-1-methyl bromide] (C30H53BrN2O2 553.66).

USP Vecuronium Bromide Related Compound D RS (C26H41NO3 415.61).

USP Vecuronium Bromide Related Compound F RS [piperidinium, 1-[(2,3,5,16,17)-17-acetyloxy-3-hydroxy-2-(1-piperidinyl)androstan-16-yl]-1-methyl bromide] (C32H55BrN2O3 595.69).

USP Verapamil Hydrochloride RS— Dry portion at 105 for 2 hours before using. Keep container tightly closed. Protect from light.

USP Verapamil Related Compound A RS [3,4-dimethoxy--[3- (methylamino)propyl]--(1-methylethyl)-benzeneacetonitrile monohydrochloride] (C17H26N2O2·HCl 326.87) —Do not dry before using. Keep container tightly closed. Protect from light.

USP Verapamil Related Compound B RS [benzeneacetonitrile, -[2-[[2-(3,4-dimethoxyphenyl)-ethyl]methylamino]ethyl]-3,4-dimethoxy--(1-methylethyl)-, monohydrochloride] (C26H36N2O4·HCl 477.05) —Do not dry before using. Keep container tightly closed. Protect from light.

USP Verteporfin RS (C41H42N4O8 718.79) —This is a mixture of 23H,25H-benzo[b]porphine-9,13-dipropanoic acid, 18-ethenyl-4,4a-dihydro-3,4-bis(methoxycarbonyl)-4a,8,14,19-tetramethyl, 9-methyl ester, trans-(±) and 23H,25H-benzo[b]porphine-9,13-dipropanoic acid, 18-ethenyl-4,4a-dihydro-3,4-bis(methoxycarbonyl)-4a,8,14,19-tetramethyl-, 13-methyl ester, trans-(±). Determine the water content titrimetrically at the time of use. Preserve in tight containers, and store in a freezer.

USP Verteporfin Related Compound A RS [trans-(±)-18-ethenyl-4,4a-dihydro-3,4-bis(methoxycarbonyl)-4a,8,14,19-tetramethyl-23H,25H-benzo[b]porphine-9,13-dipropionic acid] (C40H40N4O8 704.77) —Do not dry before using. Keep container tightly closed and protected from light.

USP Vidarabine RS— This is the monohydrate form of Vidarabine. Do not dry before using. Keep container tightly closed. Protect from light. Store in a cold place.

USP Vinblastine Sulfate RS— Equilibrate to ambient temperature before opening. After opening ampul, allow the contents to equilibrate for 30 minutes with the ambient humidity before weighing for analyses. Using thermogravimetric analysis, heat a separate equilibrated 10-mg portion at 5 per minute between ambient temperature and 200 under nitrogen flowing at 40 mL per minute (see Thermal Analysis 891). From the thermogram, determine the accumulated loss in weight between ambient temperature and a point on the plateau before decomposition is indicated (at about 160). Keep the containers tightly closed and protected from light, and store in a cold place.

USP Vincristine Sulfate RS— Store unopened ampul in a cold place. After opening ampul, allow the contents to equilibrate for 30 minutes with the ambient humidity before weighing for analysis. Using thermogravimetric analysis, heat a separate equilibrated 10-mg portion at 5 per minute between ambient temperature and 200 under nitrogen flowing at 40 mL per minute. From the thermogram, determine the accumulated loss in weight between ambient temperature and a point on the plateau before decomposition is indicated (at about 160). Keep the containers tightly closed and protected from light, and store in a cold place.

USP Vinorelbine Related Compound A RS [4-O-deacetylvinorelbine] (C43H52N4O7·2C4H6O6 1037.07) —Do not dry. Keep under inert gas with container tightly closed. Protect from light. Store in a freezer.

USP Vinorelbine Tartrate RS— Do not dry. Keep under inert gas with container tightly closed. Protect from light. Store in a freezer.

USP Vitamin A RS— To use, snip off end of the capsule, expel and weigh the solution. Discard the unused portion after opening individual capsules. Keep container tightly closed, and store in a cool, dry place, or in a refrigerator, protected from light.

USP Vitamin D Assay System Suitability RS— Do not dry. Allow it to attain room temperature before opening ampul. Transfer unused contents of ampul to a tightly closed container, and store under nitrogen in the dark, in a cool place.

USP Vitexin RS— Do not dry. Keep container tightly closed. Protect from light. Store in a cold, dry place.