MOD 2 Flashcards
- a mixture of finely divided drugs from the comminution of chemicals in dry form.
- The powder may be used internally or externally.
POWDERS
ADVANTAGES OF POWDERS
- Flexibility of compounding
- Good chemical stability
- Rapid dispersion of ingredients because of the small particle size
DISADVANTAGES
- Time-consuming preparation
- Inaccuracy of dose
- Unsuitability for many unpleasant-tasting, hygroscopic, and deliquescent drugs
determined by the size of sieve they will pass through generally range from 0.1 to 10 micron in size
PARTICLE SIZE
indicates the number of openings in the mesh screen per inch.
SCREEN SIZE
medicated powders usually present in large quantities or volumes and are limited to non-potent substances
BULK POWDERS
- dispensed in individualized doses
- potent
- examples of these powders are dusting powder, oral powders, triturations, douche, insufflations, and dentifrices.
DIVIDED POWDERS
- Continuous rubbing or grinding of the powder in a mortar with a pestle
- Product: dry powder
TRITURATION
TYPE OF MORTAR & PESTLE
for solids to aid in dissolution in liquids
WEDGEWOOD
TYPES OF MORTAR & PESTLE
- liquids & semisolids
- nonporous & non staining
GLASS
- Triturating it in a mortar and pestle or using an ointment slab and spatula.
- This method is often used to prevent a gritty feel when solids are incorporated into dermatologic or ophthalmic ointments and suspensions.
- Products: paste
LEVIGATION
common levigating agent
MINERAL OIL
GLYCERIN
- using an additional materials in which that material is soluble - a volatile solvent that evaporates
- The dissolved powder is then mixed in a mortar or spread on an ointment slab to enhance the evaporation of the solvent. As the solvent evaporates, the powder will recrystallize out of solution as fine particles
- This technique is often used with gummy substances that reagglomerate or resist grinding
- By grinder & mill
PULVERIZATION BY INTERVENTION
Example of volatile solvent
ALCOHOL
ACETONE
- A spatula is used to blend small amounts of powders on a sheet of paper or a pill tile.
- This method is not suitable for large quantities of powders or for powders that contain potent substances because homogeneous blending may not occur.
- This method is particularly useful for solid substances that liquefy or form eutectic mixtures (i.e., mixtures that melt at a lower temperature than any of their ingredients) when in close, prolonged contact with one another because little compression or compaction results.
SPATULATION
These substances include phenol, camphor, menthol, thymol, aspirin, phenylsalicylate, and phenacetin.
EUTECTIC MIXTURES
To diminish contact, powders prepared from eutrectic mixtures are commonly mixed with an
INERT DILUENT
prevents eutexia with aspirin, phenylsalicylate, and other troublesome compounds
SILICIC ACID (20%)
- If comminution is desired, a porcelain or ceramic mortar with a rough inner surface is preferred to a glass mortar with a smooth working surface.
- A glass mortar is preferable for chemicals that stain a porcelain or ceramic surface as well as for simple admixture of substances without special need for comminution. A glass mortar cleans more readily after use.
TRITURATION
- is used when potent substances must be mixed with a large amount of diluent.
- The potent drug and an approximately equal volume of diluent are placed in a mortar and thoroughly mixed by trituration.
- A second portion of diluent, equal in volume to the powder mixture in the mortar, is added, and trituration is repeated. The process is continued; equal volumes of diluent are added to the powder mixture in the mortar until all of the diluent is incorporated.
GEOMETRIC DILUTION
- Powders are mixed by passing them through sifters similar to those used to sift flour.
- This process results in a light, fluffy product. Usually, it is not acceptable for incorporating potent drugs into a diluent base.
SIFTING
- is the process of mixing powders in a large container rotated by a motorized process.
- These blenders are widely used in industry, as are large-volume powder mixers that use motorized blades to blend the powder in a large mixing vessel.
TUMBLING
dispensed in bulk containers such as perforated or sifter can, aerosol container and wide-mouthed glass jar
BULK
dispensed in papers that are properly folded and placed in re sealable plastic
DIVIDED POWDERS
SOLUTIONS
Volatile substances (e.g., camphor, menthol, essential oils) can be lost by volatilization after they are incorporated into powders.
USE OF HEAT SEALED PLASTIC BAGS or DOUBLEE WRAPING WITH WAXED OR GLASSINE PAPER
can be added to increase the absorbability of the powders by increasing the surface area
MAGNESIUM CARBONATE
STARCH
LACTOSE
SOLUTION
Hygroscopic and deliquescent substances that become moist because of an affinity for moisture in the air
ADDING INER DILUENTS
DOUBLE WRAPPING
inert diluent for eutectic mixtures
LIGHT MAGNESIUM OXIDE
MAGNESIUM CARBONATE
substances are wrap in wax paper then wax paper will be wrapped with bond paper
DOUBLE WRAPPING
hygroscopic, deliquescent, or volatile powders should be packed in ____ rather than pasteboard containers
GLASS JARS
should be used if needed to prevent decomposition of light-sensitive components
AMBER
GREEN GLASS
all powders should be stored in
TIGHTLY LOSED CONTAINERS
SYNONYM
ASPIRIN DIVIDED POWDERS
ASPIRIN CHARTS
ASPIRIN CHARTULAE
USE/S
ASPIRIN DIVIDED POWDERS
ANALGESIC
ANTI INFLAMM
ANTIPYRETIC
ANTITHROMBOTIC
many use due to dose-dependent effects
ASPIRIN DIVIDED POWDERS
METHOD
ASPIRIN DIVIDED POWDERS
BLOCK & DIVIDE
APPROPRIATE CONTAINER
ASPIRIN DIVIDED POWDERS
WAX PAPER / RESEALABLE PLASTIC
ASPIRIN DIVIDED POWDERS
API
ASPIRIN
ASPIRIN DIVIDED POWDERS
DILUENT
LACTOSE
- a dosage form composed of dry aggregates of powder particles that may contain one or more active pharmaceutical ingredients (APIs), with or without other ingredients.
- particles ranging in size from about 4 to 10 mesh
- can be dispersed in food or Dissolved in water
- can be used in other dosage form such as making a compacted tablet or filled in the capsule with or without excipients
GRANULES
- poor flow properties
- less stable
- more likely to harden / cake
- drug float on surface; difficult to make solution
- poor compressibility
- non uniform dosing
- more dust
- less appealing
- simple method
POWDERS
- flow well
- less surface area
- more stable
- less likely to harden
- easily wetted
- good compressibility
- less dust
- more elegant appearance
- involves more processing
GRANULES
- Production of a moist mass by heating the ingredients sufficiently to drive off the water of hydration from the uneffloresced citric acid, forcing the mass through a coarse sieve and drying in an oven.
- The product should be dispensed in tightly closed glass container to protect it against humidity and air.
DRY METHOD / DRY FUSION METHOD
It involves the addition of small amounts of water to the dry salts to obtain a workable mass which is then dried and ground to yield the powder or granule.
WET METHOD / WET FUSION METHOD
SYNONYM
SODIUM PHOSPHATE EFFERVESCENT GRANULE
SODII PHOSPHAS EFFERVESCENTES
USE/S
SODIUM PHOSPHATE EFFERVESCENT GRANULE
SALINE LAXATIVE
METHOD OF PREPARATION
SODIUM PHOSPHATE EFFERVESCENT GRANULE
DRY FUSION METHOD
APPROPRIATE CONTAINER
SODIUM PHOSPHATE EFFERVESCENT GRANULE
WIDE MOUTH BOTTLE