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

USP Powdered Valerian RS.

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

USP Valproic Acid RS— Do not dry.Keep container tightly closed.Avoid contact.

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 80for 4hours before using.

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

USP Vanillin Melting Point RS— Do not dry.USP28When melted by the USPcapillary tube method,Class Ia in the general chapter Melting Range or Temperature á741ñ,the observed range falls within the indicated acceptance range.Keep container tightly closed and protected from light.

USP Vasopressin RS.

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

USP Verapamil Related Compound A RS [3,4-dimethoxy-a-[3-(methylamino)propyl]-a-(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,a-[2-[[2-(3,4-dimethoxyphenyl)-ethyl]methylamino]ethyl]-3,4-dimethoxy-a-(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 30minutes with the ambient humidity before weighing for analyses.Using thermogravimetric analysis,heat a separate equilibrated 10-mg portion at 5per minute between ambient temperature and 200under nitrogen flowing at 40mLper minute (see Thermal Analysis á891ñ).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 30minutes with the ambient humidity,before weighing for analysis.Using thermogravimetric analysis,heat a separate equilibrated 10-mg portion at 5per minute between ambient temperature and 200under nitrogen flowing at 40mLper 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.