USP Reference Standards -N, chemical structure, molecular formula, Reference Standards

USP Nabumetone RS— Do not dry.Keep container tightly closed.Store in a cold place.

USP Nabumetone Related Compound A RS [1-(6-methoxy-2-naphthyl)-but-1-en-3-one] —Do not dry.

USP Nadolol RS— Dry portion in vacuum at 60

for 3hours before using.Keep container tightly closed.

USP Nafcillin Sodium RS— Do not dry before using.Keep container tightly closed.Store in a cold place.

USP Naftifine Hydrochloride RS— Dry over phosphorous pentoxide at 105

for 4hours before using.Keep container tightly closed.

USP Nalidixic Acid RS— Dry portion at 105

for 2hours before using.Keep container tightly closed.

USP Nalorphine Hydrochloride RS— Dry portion in vacuum at 100

for 2hours before using.Keep container tightly closed.Protect from light.

USP Naloxone RS— Dry portion at 105

to constant weight before using.Keep container tightly closed.Protect from light.

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

USP Naltrexone Related Compound A RS [N-(3-butenyl)-noroxymorphone hydrochloride] (C20H23NO4·HCl

377.87) —Do not dry before using.Keep container tightly closed and protected from light.

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

USP Nandrolone Decanoate RS— Dry portion in vacuum over silica gel for 4hours before using.Keep container tightly closed.Protect from light.Store in a refrigerator.

USP Nandrolone Phenpropionate RS— Dry portion in a suitable vacuum drying tube,using phosphorus pentoxide as the desiccant,at 80

for 3hours before using.Keep container tightly closed.Protect from light.

USP Naphazoline Hydrochloride RS— Dry portion at 105

for 2hours before using.Keep container tightly closed.Protect from light.

USP Naproxen RS— Dry portion at 105

for 3hours before using.Keep container tightly closed.

USP Naproxen Sodium RS— Dry portion in vacuum at 105

for 3hours before using.Keep container tightly closed.

USP Narasin RS.

Change to read:

USP Naratriptan Hydrochloride RS —Do not dry.

Keep container tightly closed.Protect from light.Store in a freezer.

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USP Naratriptan Related Compound A RS [3-(1-methylpiperidin-4-yl)-1H-indole hydrochloride] (C14H18N2·HCl

250.8)— Do not dry.

USP Naratriptan Related Compound B RS [2-[3-(1-methyl-1,2,3,6-tetrahydropyridin-4-yl)-1H-indol-5-yl]ethanesulfonic acid methylamide oxalate] (C17H23N3O2S·C2H2O4

423.5) —Do not dry.

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

USP Neomycin Sulfate RS— Dry portion in vacuum at a pressure not exceeding 5mm of mercury at 60

for 3hours before using.Keep container tightly closed.Protect from light.Store in a cold place.

USP Neostigmine Bromide RS— Dry portion at 105

for 3hours before using.Keep container tightly closed.

USP Neostigmine Methylsulfate RS— Dry portion at 105

for 3hours before using.Keep container tightly closed.

USP Netilmicin Sulfate RS— Do not dry before using;determine the volatiles content by heating a separate 100-mg portion at 110

at a pressure of 5mm of mercury or less for 3hours.Keep container tightly closed.Protect from light.Store in a freezer.

Add the following:

USP Nevirapine Anhydrous RS— Do not dry.Keep container tightly closed.

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Add the following:

USP Nevirapine Hemihydrate RS— Do not dry.Keep container tightly closed.

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Add the following:

USP Nevirapine Related Compound A RS [5,11-dihydro-6H-11-ethyl-4-methyl-dipyrido[3,2-b:2¢,3¢-e][1,4]diazepin-6-one] (C14H14N4O

254.29)— Do not dry.Keep container tightly closed.

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Add the following:

USP Nevirapine Related Compound B RS [5,11-dihydro-4-methyl-6H-dipyrido[3,2-b:2¢,3¢-e][1,4]diazepin-6-one] (C12H10N4O

226.23)— Do not dry.Keep container tightly closed.

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

USP Niacinamide RS— Dry portion over silica gel for 4hours before using.Keep container tightly closed.

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

USP Nifedipine RS— Do not dry.Keep container tightly closed.Avoid exposure to light.Handle with care.

USP Nifedipine Nitrophenylpyridine Analog RS [dimethyl 4-(2-nitrophenyl)-2,6-dimethylpyridine-3,5-dicarboxylate] (C17H16N2O6

344.33) —Do not dry.Keep container tightly closed.Protect from light.

USP Nifedipine Nitrosophenylpyridine Analog RS [dimethyl 4-(2-nitrosophenyl)-2,6-dimethylpyridine-3,5-dicarboxylate] (C17H16N2O5

328.33) —Do not dry.Keep container tightly closed.Protect from light.

USP Nimodipine RS.

USP Nimodipine Related Compound A RS [(2-methoxyethyl-1-methylethyl-2,6-dimethyl-4-(3-nitrophenyl)pyridine-3,5-dicarboxylate] (C21H25N2O7

416.42).

USP Nitrofurantoin RS— Dry portion at 140

for 30minutes before using.Keep container tightly closed.Protect from light.

USP Nitrofurazone RS— Dry portion at 105

for 1hour before using.Keep container tightly closed.Protect from light.Avoid exposure to direct sunlight,to strong fluorescent lighting,to excessive heat,and to alkaline materials.

USP Nitrofurazone Related Compound A RS[5-nitro-2-fufuraldazine] (C10H6N4O6

278.18) —Dry portion at 105

for 1hour before using.Keep container tightly closed.Protect from light.

Change to read:

USP Nitrofurfural Diacetate RS (C9H9NO7

243.17) —

Do not dry.

USP28Keep container tightly closed.

Protect from light.

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USP5-Nitro-2-furfuraldazine RS— (NAME CHANGE)See USP Nitrofurazone Related Compound A RS.

USP Diluted Nitroglycerin RS— [Caution—Handle with care;may be exploded by percussion or excessive heat. ]Do not dry;each ampul contains approximately 200mg of a 1.00%solution (w/w)of nitroglycerin in propylene glycol.Store unopened ampuls at 4

;allow to equilibrate to room temperature before opening ampul.Once opened,protect from moisture and light,and use promptly.Discard any unused portion.

USP Nizatidine RS— Dry portion at 100

for 1hour before using.Keep container tightly closed and protected from light.

USP Nonoxynol 9RS— Do not dry.Once opened,take precautions against contact with air.Keep container tightly closed.

USP Nordazepam RS [7-chloro-1,3-dihydro-5-phenyl-2H-1,4-benzodiazepin-2-one] (C15H11ClN2O

270.72) —Do not dry before using.Keep container tightly closed.Protect from light.

USP Norepinephrine Bitartrate RS— Do not dry.This is the monohydrate form of norepinephrine bitartrate.Keep container tightly closed.Protect from light.

Change to read:

USP Norethindrone RS—

Do not dry.

USP28Keep container tightly closed.

USP Norethindrone Acetate RS— Dry portion at 105

for 3hours before using.Keep container tightly closed.

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

USP Norfloxacin RS— Dry portion in vacuum at a pressure not exceeding 5mm of mercury at 100

for 2hours before using.Keep container tightly closed.Protect from light.

USP Norgestimate RS— Dry a portion at 105

for 3hours.Keep containers tightly closed.

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

USP Noroxymorphone Hydrochloride RS— Do not dry before using.Keep container tightly closed.Protect from light.

USP Nortriptyline Hydrochloride RS— Dry portion at 105

for 3hours before using.Keep container tightly closed.Protect from light.

USP Noscapine RS— Do not dry;determine the water content titrimetrically at time of use.Keep container tightly closed.

USP Novobiocin RS— Dry portion in vacuum at a pressure not exceeding 5mm of mercury at 100

for 4hours before using.Keep container tightly closed.Protect from light.Store in a cold place.

USP Nystatin RS— Dry portion in vacuum at a pressure not exceeding 5mm of mercury at 40

for 2hours before using.Keep container tightly closed.Protect from light.Store in a freezer.