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 60for 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 105for 4hours before using.Keep container tightly closed.
USP Nalidixic Acid RS
Dry portion at 105for 2hours before using.Keep container tightly closed.
USP Nalorphine Hydrochloride RS
Dry portion in vacuum at 100for 2hours before using.Keep container tightly closed.Protect from light.
USP Naloxone RS
Dry portion at 105to 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 80for 3hours before using.Keep container tightly closed.Protect from light.
USP Naphazoline Hydrochloride RS
Dry portion at 105for 2hours before using.Keep container tightly closed.Protect from light.
USP Naproxen RS
Dry portion at 105for 3hours before using.Keep container tightly closed.
USP Naproxen Sodium RS
Dry portion in vacuum at 105for 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.USP28
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 60for 3hours before using.Keep container tightly closed.Protect from light.Store in a cold place.
USP Neostigmine Bromide RS
Dry portion at 105for 3hours before using.Keep container tightly closed.
USP Neostigmine Methylsulfate RS
Dry portion at 105for 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 110at 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.USP28 Add the following:
USP Nevirapine Hemihydrate RS
Do not dry.Keep container tightly closed.USP28 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.USP28 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.USP28
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 140for 30minutes before using.Keep container tightly closed.Protect from light.
USP Nitrofurazone RS
Dry portion at 105for 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 105for 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.USP28
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 100for 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 105for 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 100for 2hours before using.Keep container tightly closed.Protect from light.
USP Norgestimate RS
Dry a portion at 105for 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 105for 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 100for 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 40for 2hours before using.Keep container tightly closed.Protect from light.Store in a freezer.