USP Paclitaxel RS—
Do not dry.Keep container tightly closed.Protect from light.Store in a refrigerator.
USP Paclitaxel Related Compound A RS
[cephalomannine] —Do not dry.Keep container tightly closed.Protect from light.Store in a refrigerator.
USP Paclitaxel Related Compound B RS
[10-deacetyl-7-epipaclitaxel] —Do not dry.Keep container tightly closed.Protect from light.Store in a refrigerator.
USP Padimate O RS
Do not dry;determine the water content titrimetrically,for quantitative application,at the time of use.Keep container tightly closed.Protect from light.
USP Palmitic Acid RS
Dry portion over silica gel for 4hours before using.Keep container tightly closed.
USP Pamoic Acid RS
(C23H16O6 388.38) —Dry portion in vacuum at 100for 3hours before using.Keep container tightly closed.
USP Pancreatin Amylase and Protease RS
Keep container tightly closed,and store in a refrigerator.Do not open while cold,and do not dry before using.
USP Pancreatin Lipase RS
Keep container tightly closed,and store in a refrigerator.Do not open while cold,and do not dry before using.
USP Pancuronium Bromide RS
[3a,17b-dihydroxy-2b,16b-dipiperidinyl-5a-androstane,3,17-diacetate,dimethobromide] (C35H60Br2N2O4 732.67).
USP Racemic Panthenol RS
Do not dry.Keep container tightly closed.
USP Pantolactone RS
Do not dry.Keep container tightly closed.Protect from light.
USP Papain RS
Do not dry before using.Keep container tightly closed,protected from light,and store in a refrigerator.Do not open while cold.
USP Papaverine Hydrochloride RS
Dry portion at 105for 2hours before using.Keep container tightly closed.Protect from light.
USP Paramethasone Acetate RS
Dry portion in vacuum at 105for 4hours before using.Keep container tightly closed.
USP Parbendazole RS
Do not dry before using.Keep container tightly closed.Store in a refrigerator.
USP Paricalcitol RS.

USP Paricalcitol Solution RS.

USP Paromomycin 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 Paroxetine Hydrochloride RS—
Do not dry.This is the hemihydrate form of Paroxetine Hydrochloride.Keep container tightly closed.Protect from light.Store in a refrigerator.
USP Paroxetine Related Compound A RS
[trans-4-(p-methoxyphenyl)-3-[(3,4-methylenedioxy)phenoxy]methylpiperidine hydrochloride] —Do not dry before use.Keep container tightly closed.Protect from light.
USP Paroxetine Related Compound B RS
[trans-4-phenyl-3-[(3,4-methylenedioxy)phenoxy]methylpiperidine acetate] —Do not dry before use.Keep container tightly closed.Protect from light.
USP Paroxetine Related Compound C RS
[(+)-trans-paroxetine hydrochloride] —Do not dry before use.Keep container tightly closed.Protect from light.
USP Paroxetine Related Compound D RS
[cis-paroxetine hydrochloride] —Do not dry.Keep container tightly closed.Protect from light.Store in a refrigerator.
USP Paroxetine Related Compound E RS
[paroxetine containing 1-methyl-4-(p-fluorophenyl)-1,2,3,6-tetrahydropyridine] —Do not dry.
USP Paroxetine Related Compound F RS
[trans(–)-1-methyl-3-[1,3-benzodioxol-5-yloxy)methyl]-4-(fluorophenyl)piperidine] (C20H22FNO3 343.39).
USP Paroxetine Related Compound G RS
[(±)trans-3-[(1,3-benzodioxol-5-yloxy)methyl]-4-(4¢¢-fluorophenyl-4¢-phenyl)piperidine hydrochloride] (C25H24FNO3 405.46).
USP Parthenolide RS
Do not dry before using.Keep container tightly closed.Protect from light.Store in a freezer.For quantitative applications use a value of 0.98mg parthenolide per mg on the as-is basis.
USP Particle Count RS(2blanks and 2suspensions)—
The set consists of 2vials containing a suspension of 15-µm polystyrene spheres and 2vials containing the aqueous phase without particles (the blank).Particles must be resuspended before use.Do not open until ready to begin the test as set forth in chapter Particulate Matter in Injections á788ñ.Store in a cool place.PROTECT FROM FREEZING.
USP Penbutolol Sulfate RS
Dry portion at 105for 3hours before using.Keep container tightly closed and protected from light.
USP Penicillamine RS
—Do not dry.Keep container tightly closed,protected from light,and store in a cold place.
USP Penicillamine Disulfide RS
(C10H20N2O4S2) —Do not dry before using.Keep container tightly closed.
USP Penicillin G Benzathine RS
Do not dry before using.Keep container tightly closed.Protect from light.Store in a cold place.
USP Penicillin G Potassium RS
Do not dry before using.Keep container tightly closed.Protect from light.Store in a cold place.
USP Penicillin G Procaine RS—
Do not dry.This is the monohydrate form of Penicillin G Procaine.Keep container tightly closed.Store in a refrigerator.
USP Penicillin G Sodium RS
Dry portion in vacuum at 60for 3hours.Keep container tightly closed.Store in a refrigerator.
USP Penicillin V RS
Do not dry before using.Keep container tightly closed.
USP Penicillin V Potassium RS
Do not dry before using.Keep container tightly closed.Protect from light.Store in a cold place.
USP Pentazocine RS
Dry portion at 60and at a pressure not exceeding 5mm of mercury to constant weight before using.Keep container tightly closed.Protect from light.
USP Pentetic Acid RS
Do not dry before using.Keep container tightly closed.
USP Pentobarbital RS—
Do not dry.Keep container tightly closed.
USP Pentoxifylline RS
Dry portion in vacuum at a pressure not exceeding 5mm of mercury at 60for 3hours before using.
USP Perflubron RS—
Do not dry.After opening ampul,store in a tightly closed container.Protect from light.
USP Pergolide Mesylate RS
Do not dry.
USP Pergolide Sulfoxide RS
[(8b)-8-[(methylsulfinyl)methyl]-6-propyl-D-ergoline] —Do not dry.
USP Perphenazine RS
Dry portion in vacuum at 65for 3hours before using.Keep container tightly closed.Protect from light.
USP Perphenazine Sulfoxide RS
Do not dry.Keep container tightly closed.Protect from light.
USP Phenacetin Melting Point RS
Dry portion over silica gel for 16hours before using.When melted by the USPcapillary tube method,Class Ia in chapter á741ñMelting Range and Temperature,the observed range falls within the indicated acceptance range.Keep container tightly closed.
USP Phenazopyridine Hydrochloride RS
Dry portion at 105for 4hours before using.Keep container tightly closed.
USP Phendimetrazine Tartrate RS
Dry portion at 105to constant weight before using.Keep container tightly closed.
USP Phenelzine Sulfate RS
Dry portion at a pressure not exceeding 5mm of mercury over silica gel at 80for 2hours before using.Keep container tightly closed.Protect from light and heat.
USP Pheniramine Maleate RS
Dry portion in vacuum at 65for 6hours before using.Keep container tightly closed.
USP Phenmetrazine Hydrochloride RS
Dry portion at 105for 2hours before using.Keep container tightly closed.
USP Phenobarbital RS
Dry portion at 105for 2hours before using.Keep container tightly closed.
USP Phenoxybenzamine Hydrochloride RS
Dry portion in vacuum at 60for 2hours before using.Keep container tightly closed. Add the following:
USP Phenoxyethanol RS.
USP28
USP Phensuximide RS
Dry portion in vacuum at 50for 4hours before using.Keep container tightly closed.
USP Phentermine Hydrochloride RS
Dry portion at 105for 3hours before using.Keep container tightly closed.
USP Phentolamine Mesylate RS
Dry portion in vacuum at 60for 4hours before using.Keep container tightly closed.Protect from light.
USPL-Phenylalanine RS
Dry portion at 105for 3hours before using.Keep container tightly closed.
USP Phenylbutazone RS
Dry portion in vacuum at a pressure of 30±10mm of mercury at 80for 4hours before using.Keep container tightly closed.
USP Phenylephrine Hydrochloride RS—
Do not dry.Keep container tightly closed.Protect from light.
USP5-Phenylhydantoin RS
Do not dry before using.Keep container tightly closed.
USP Phenylpropanediol RS
[1-phenyl-1,2-propanediol] (C9H12O2 152.19) —Do not dry.Keep container tightly closed and protected from light.
USP Phenylpropanolamine Bitartrate RS
Dry portion at 65for 3hours before using.Keep container tightly closed and protected from light.
USP Phenylpropanolamine Hydrochloride RS
Dry portion at 105for 2hours before using.Keep container tightly closed.Protect from light. Add the following:
USP Phenyltoloxamine Citrate RS—
Dry it in vacuum at 80for 3hours.Keep the container tightly closed.Protect from light.USP28 Add the following:
USP Phenyltoloxamine Related Compound A RS
[3-(2-dimethylaminoethoxy)diphenylmethane] (C17H21NO 255.35) —Do not dry.Keep the container tightly closed.Protect from light.USP28
USP Phenytoin RS
Dry portion at 105for 4hours before using.Keep container tightly closed.
USP Phenytoin Related Compound A RS
[diphenylglycine] (C14H15NO2 227.26) —Do not dry.Keep container tightly closed.Protect from light.
USP Phenytoin Related Compound B RS
[diphenylhydantoic acid] (C15H12N2O2 252.27) —Do not dry.Keep container tightly closed.Protect from light.
USP Phenytoin Sodium RS
Dry portion at 105for 4hours before using.Keep container tightly closed.
USP Phosphated Riboflavin RS
Dry portion at 105for 2hours.Keep container tightly closed.
USP Physostigmine Salicylate RS
Do not dry.Keep container tightly closed.Protect from light.
USP Phytonadione RS
This material decomposes on exposure to sunlight.Do not dry before using.Keep container tightly closed.Protect from light.Store in a refrigerator.
USP Pilocarpine RS
Do not dry.Allow ampul to equilibrate to room temperature before opening. Change to read:
USP Pilocarpine Hydrochloride RS
Dry portion at 105for 2hours before using.Keep container tightly closed.Protect from light.Store in a refrigerator.USP28
USP Pilocarpine Nitrate RS
Dry portion at 105for 2hours before using.Keep container tightly closed.Protect from light.
USP Pimozide RS
Dry portion in vacuum at 80for 4hours before using.Keep container tightly closed.Protect from light.
USP Pindolol RS
Dry portion at 105for 4hours before using.Keep container tightly closed.Protect from light.
USP Piperacillin RS
Do not dry.For quantitative applications determine the water content at the time of use.Keep container tightly closed,and store in a cold,dry place,protected from light.
USP Piroxicam RS
Do not dry before using.Keep container tightly closed.Protect from light.
USP Plicamycin RS
Dry portion in vacuum at a pressure not exceeding 5mm of mercury at 25for 4hours before using.Keep container tightly closed.Protect from light.Store in a cold place.
USP Polacrilex Resin RS
Do not dry before using.Keep container tightly closed.
USP Polacrilin Potassium RS
Dry portion at 105for 6hours before using.Keep container tightly closed.
USP Poloxalene RS
Do not dry.Keep container tightly closed.Protect from light.Store in a cool place.
USP Polydimethylsiloxane RS
Do not dry before using.After opening ampul,store in a tightly closed container.
USP High-Density Polyethylene RS
[NOTE—Exercise care in handling and storage to avoid scratching the smooth surfaces of the strips.]Prepare samples as directed in the respective USP General Tests Chapters.Do not dry.
USP Polyethylene Oxide RS
Dry portion in vacuum at room temperature to constant weight before using.Keep container tightly closed.Protect from light.
USP Low-Density Polyethylene RS
[NOTE—Exercise care in handling and storage to avoid scratching smooth surfaces of strips.]Cut segments to dimensions necessary for mounting in holders used for reflectance spectrum determinations.Prepare samples for thermal analysis from remaining portions of strips.Do not dry.
USP Polyethylene Terephthalate RS
[NOTE—Exercise care in handling and storage to avoid scratching smooth surfaces of strips.]Cut segments to dimensions necessary for mounting in holders used for reflectance spectrum determinations.Prepare samples for thermal analysis from remaining portions of strips.Do not dry.
USP Polyethylene Terephthalate G RS
[NOTE—Exercise care in handling and storage to avoid scratching smooth surfaces of strips.]Cut segments to dimensions necessary for mounting in holders used for reflectance spectrum determinations.Prepare samples for thermal analysis from remaining portions of strips.Do not dry.
USP Polyisobutylene RS.

USP Polymyxin B 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 Polyoxyl 20Cetostearyl Ether RS.

USP Polyoxyl 10Oleyl Ether RS.
Change to read:
USP Polyoxyl 10USP28Stearyl Ether RS.

USP Polyoxyl 40Stearate RS
Do not dry before using.Keep container tightly closed.
USP Polyoxyl Lauryl Ether RS.

USP Polyoxyl Oleate RS.

USP Posterior Pituitary RS
Do not dry before using.Store at a temperature of 0or below.Each mg represents 2.4USP Posterior Pituitary Units of oxytocic activity and 2.1USP Posterior Pituitary Units of vasopressor activity.Do not freeze.
USP Potassium Gluconate RS
Dry portion in vacuum at 105for 4hours before using.Keep container tightly closed.
USP Potassium Guaiacolsulfonate RS
Do not dry.Determine the water content titrimetrically before use for quantitative analyses.Keep container tightly closed.Protect from light.
USP Potassium Perchlorate RS.

USP Potassium Sucrose Octasulfate RS[NOTE—Sucrosofate Potassium is USAN]
[a-D-glucopyranoside,1,3,4,6-tetra-O-sulfo-b-D-fructofuranosyl,tetrakis (hydrogen sulfate),octapotassium salt,heptahydrate] (C12H14K8O35S8·7H2O 1413.64CAS-76578-81-9). (anhydrous C12H14K8O35S8 1287.53CAS-73264-44-5) —Do not dry;determine the water content titrimetrically when used for quantitative analyses.Keep container tightly closed,and store in a freezer.Allow to equilibrate to ambient temperature before opening.
USP Potassium Trichloroammineplatinate RS
(Cl3H3KNPt 357.58) —Dry portion in vacuum at room temperature over phosphorus pentoxide in a desiccator for 20hours before use.Keep container tightly closed.
USP Pralidoxime Chloride RS
Dry portion at 105for 3hours before using.Keep container tightly closed.
USP Pramoxine Hydrochloride RS
Dry portion at 105for 1hour before using.Keep container tightly closed.
USP Praziquantel RS
Dry portion in vacuum at a pressure not exceeding 5mm of mercury at 50over phosphorus pentoxide for 2hours before using.Keep container tightly closed.Protect from light.
USP Praziquantel Related Compound A RS
[2-benzoyl-1,2,3,6,7,11b-hexahydro-4H-pyrazino [2,1-a]isoquinolin-4-one] (C19H18N2O2 306.37) —Dry portion in vacuum at a pressure not exceeding 5mm of mercury at 50over phosphorus pentoxide for 2hours before using.Keep container tightly closed.Protect from light.
USP Praziquantel Related Compound B RS
[2-(cyclohexylcarbonyl)-2,3,6,7-tetrahydro-4H-pyrazino [2,1-a]isoquinolin-4-one] (C19H22N2O2 310.40) —Dry portion in vacuum at a pressure not exceeding 5mm of mercury at 50over phosphorus pentoxide for 2hours before using.Keep container tightly closed.Protect from light.
USP Praziquantel Related Compound C RS
[2-(N-formylhexahydrohippuroyl-1,2,3,4-tetrahydroisoquinolin-1-one] (C19H22N2O4 342.39) —Dry portion in vacuum at a pressure not exceeding 5mm of mercury at 50over phosphorus pentoxide for 2hours before using.Keep container tightly closed.Protect from light.
USP Prazosin Hydrochloride RS
Do not dry;determine the water content titrimetrically at the time of use.Keep container tightly closed.Protect from light.
USP Prednisolone RS
Dry portion in vacuum at 105for 3hours before using.Keep container tightly closed.
USP Prednisolone Acetate RS
Dry portion at 105for 3hours before using.Keep container tightly closed.
USP Prednisolone Hemisuccinate RS
Dry portion in vacuum at 65for 3hours before using.Keep container tightly closed.
USP Prednisolone Tebutate RS
Dry portion in vacuum at a pressure of not more than 5mm of mercury at 105for 4hours before using.Keep container tightly closed.
USP Prednisone RS
Dry portion at 105for 3hours before using.Keep container tightly closed.
USP Prednisone Tablets RS(Dissolution Calibrator,Disintegrating)—
The label states the nominal weight of prednisone in each tablet.Use only whole tablets.Remove any surface dust with a soft brush before using.Keep container tightly closed.Store in a desiccator or in a dry place at room temperature.
USP Prilocaine Hydrochloride RS
Dry portion at 105for 4hours before using.Keep container tightly closed.
USP Primaquine Phosphate RS
Dry portion at 105for 2hours before using.Keep container tightly closed.
USP Primidone RS
Dry portion at 105for 2hours before using.Keep container tightly closed.
USP Probenecid RS
Dry portion at 105for 4hours before using.Keep container tightly closed.
USP Probucol RS
Dry portion in a vacuum at 80for 1hour before using.Keep container tightly closed.Protect from light.
USP Probucol Related Compound A RS
[2,2¢,6,6¢-tetra-tert-butyldiphenoquinone] (C28H40O2 408.63) —Do not dry.Keep container tightly closed.Protect from light.
USP Probucol Related Compound B RS
[4,4¢-(dithio)bis(2,6-di-tert-butylphenol)] (C28H42O2 474.78) —Do not dry.Keep container tightly closed.Protect from light.
USP Probucol Related Compound C RS
[4-[(3,5-di-tert-butyl-2-hydroxyphenylthio)isopropylidenethio]-2,6-di-tert-butylphenol] (C31H48O2S2 516.86) —Do not dry.Keep container tightly closed.Protect from light.
USP Procainamide Hydrochloride RS
Dry portion at 105for 4hours before using.Keep container tightly closed.Material is hygroscopic.
USP Procaine Hydrochloride RS
Dry portion over silica gel for 18hours before using.Keep container tightly closed.
USP Procarbazine Hydrochloride RS
Keep container tightly closed.Protect from light.Store in a cool place.
USP Prochlorperazine Maleate RS
Dry portion in vacuum at 60for 2hours before using.Keep container tightly closed.Protect from light.
USP Procyclidine Hydrochloride RS
Dry portion in vacuum at 105for 4hours before using.Keep container tightly closed.Protect from light.
USP Progesterone RS
Do not dry.Keep container tightly closed.Protect from light.
USP Proinsulin (Beef)RS.

USP Proinsulin (Pork)RS.

USPL-Proline RS
Dry portion at 105for 3hours before using.Keep container tightly closed.
USP Promazine Hydrochloride RS
Dry portion at 105for 2hours before using.Keep container tightly closed.Protect from light.
USP Promethazine Hydrochloride RS
Dry portion at 105for 4hours before using.Keep container tightly closed.Protect from light.
USP Propafenone Hydrochloride RS—
Do not dry.Keep container tightly closed.Protect from light.
USP Propantheline Bromide RS
Dry portion at 105for 4hours before using.Store under inert gas,and keep container tightly closed. Change to read:
USP Propantheline Bromide Related Compound A RS[9-hydroxypropantheline bromide]USP28
(C23H30BrNO4 464.39) —Do not dry.Keep container tightly closed.Avoid contact.Store in a desiccator.Protect from light.Store under inert atmosphere.
USP Proparacaine Hydrochloride RS
Dry portion at 105for 3hours before using.Keep container tightly closed.
USP Propofol RS.

USP Propofol Related Compound A RS[3,3¢-5,5¢-tetraisopropyldiphenol].

USP Propofol Related Compound B RS[2,6-diisopropylbenzoquinone].

USP Propofol Resolution RS[propofol and 2-isopropyl-6-n-propylphenol].

USP Propofol for System Suitability RS[propofol,3,3¢-5,5¢-tetraisopropyldiphenol and 2-(1-methylethoxy)-1,3-bis(1-methylethyl)benzene].

USP Propoxycaine Hydrochloride RS
Dry portion at 105for 3hours before using.Keep container tightly closed.Protect from light.
USP Propoxyphene Hydrochloride RS
Dry portion at 105for 3hours before using.Keep container tightly closed.
USP Propoxyphene Napsylate RS
This is the monohydrate form.Do not dry;determine the water content titrimetrically at time of use for quantitative analyses.Keep container tightly closed.
USP Propoxyphene Related Compound A RS
[a-d-4-dimethylamino-1,2-diphenyl-3-methyl-2-butanol hydrochloride] (C19H25NO·HCl 319.87) —Do not dry before using.Keep container tightly closed and protected from light. Add the following:
USP Propoxyphene Related Compound B RS[a-d-2-Acetoxy-4-dimethylamino-1,2-diphenyl-3-methylbutane]
(C21H27NO2 325.45) —Do not dry before using.Keep container tightly closed and protected from light.USP28
USP Propranolol Hydrochloride RS
Dry portion at 105for 4hours before using.Keep container tightly closed.
USP Propylene Carbonate RS
Do not dry before using.Keep container tightly closed.
USP Propylene Glycol RS
Do not dry before using.After opening ampul,transfer to a tightly closed container.
USP Propyl Gallate RS
Dry portion at 105for 4hours before using.Keep container tightly closed.Protect from light,and avoid contact with metals.
USP Propylparaben RS
Dry portion over silica gel for 5hours before using.Keep container tightly closed.
USP Propylthiouracil RS
Dry portion at 105for 2hours before using.Keep container tightly closed.Protect from light.
USP Prostaglandin A1RS
Do not dry before using.Keep container tightly closed.Store in a freezer.
USP Prostaglandin B1RS
(C20H32O4 336.47) —Do not dry before using.Keep container tightly closed,and store in a freezer.
USP Protriptyline Hydrochloride RS
Dry portion at a pressure below 5mm of mercury at 60to constant weight before using.Keep container tightly closed.
USP Pseudoephedrine Hydrochloride RS
Dry portion at 105for 3hours before using.Keep container tightly closed.Protect from light.
USP Pseudoephedrine Sulfate RS
Dry portion at 105for 2hours before using.Keep container tightly closed.Protect from light.
USP Pyrantel Pamoate RS
Dry portion in vacuum at 60for 3hours before using.Keep container tightly closed.Protect from light.
USP Pyrazinamide RS
Dry portion over silica gel for 18hours before using.Keep container tightly closed.
USP Pyrethrum Extract RS.

USP Pyridostigmine Bromide RS
Dry portion in a suitable vacuum drying tube,using phosphorus pentoxide as the desiccant,at 100for 4hours before using.Keep container tightly closed,and store in a desiccator.
USP Pyridoxine Hydrochloride RS
Dry portion in vacuum over silica gel for 4hours before using.Keep container tightly closed.Protect from light.
USP Pyrilamine Maleate RS
Do not dry.Keep container tightly closed.Protect from light.
USP Pyrimethamine RS
Dry portion at 105for 4hours before using.Keep container tightly closed.Protect from light.
USP Pyrvinium Pamoate RS
Do not dry;determine the water content titimetrically at time of use.Keep container tightly closed.Protect from light.