Granules are agglomerates of powder particles that are larger in size, ranging from 0.2 to 4.0 mm. They are formed through a process called granulation where primary powder particles adhere together. Granules have better flow properties and compressibility compared to powders. They are often used as an intermediate step in tablet production since granules flow more evenly into tablet dies compared to powders. Granules can be prepared through wet or dry granulation methods.

2.  Granules are prepared agglomerates of
smaller particles of powders. they are
irregular shaped but May be prepared to be
spherical.
 Granules size ranges between 0.2 to 4.0 mm
depending upon use of granules

3.  The process in which the primary powders
particles are Made adhere to form larger
Multi particle entities called granulation.

4.  To prevent segregation of the constituents of
powder Mix
 To improve the flow properties of the powder
mix
 To improve the compaction characteristics of
powder mix

5.  Granules are usually made as a step to
prepare tablets. Granules flow into the dies
more evenly and more freely than particles
from the hopper. A few advantages of
granules over powders are listed below:
 Granules flow better than powders. The easy
flow characteristics are important in
supplying drug materials from the hopper or
feeding container into the tableting presses.
For this reason powder mixtures are usually
granulated if they are intended to be
compressed into tablets. Granules also
eliminate or control dust.

6.  Granules have smaller surface area than a
comparable volume of powders. This makes
granules more stable physically and
chemically than the corresponding powders.
Granules are less likely to cake or harden
upon standing than are powders.

7.  Granules are more easily wetted by a solvent
than are certain powders, so that granules are
also preferred in making solutions. Example:
Principen® (ampicillin) for Oral Suspension
(Squibb). Ampicillin is unstable in aqueous
solution, so it is usually prepared as granules and
reconstituted by a pharmacist with purified
water just prior to dispensing. The granules also
contain colorants, flavorants, and other
pharmaceutical ingredients, so the resulting
solution or suspension has all the de-sired
medicinal and pharmaceutical features of a
liquid pharmaceutical.

8.  Granules produce particle-size uniformity,
thus content uniformity.
 Granules increase compressibility.

9. Granules are prepared by two methods
1. Wet granulation
2. Dry granulation

10.  Usually wet granulation is done in two
manners
1. One method is to moistened the powder or
powder mixture and then pass through a
screen of the mash size to produce the
desire size of granules. these granules are
dried by using dry heat.
2. Another types is bed processing in
which particles are placed in a conical
piece of equipment and are vigorously
dispersed and suspended wile liquid
excipient is sprayed on particles and dried.

11. Dry granulation is also done in couple of ways
1. The dry powder is passed trough a roll
compactor and than through a granulating
machine. Roll compactor processes a fine
powder into dense sheet. The compacted
powder is granulated to uniform particle
size. then used in formation of different
textures.

12.  Compression of a powder mixture into a
large tablets on a compressing machine
under 8000 to 12000lb of pressure.

13.  Biaxin granules for oral suspension(abbot)
 Omnicef for oral suspension(abbot)
 Augmenton ES-600(GLAXOSMITH KLINE0)
 Effervescent granules

14.  Effervescent salts are granules or coarse to
very coarse powder containing a medicinal
agent in a dry mixture usually composed of
sodium bicarbonate, citric acid and tartaric
acid . When added to water the acid and
base react to liberate carbon dioxide
resulting in effervescence.
 The resulting carbonated solution mask the
undesirable taste of medicinal agent.
 effervescent tablets and granules are
dissolve in water before use

15. Effervescent granules are prepared by two
general methods.
1. The dry or fusion method
2. The wet method

16.  In fusion method the one molecule of water
present in each molecule of citric acid acts
as the binding agent for the powder mixture.
Before mixing the powder the citric acid
crystals are powdered and then mixed with
other powders of the same size to ensure
uniformity of the mixture.
 After mixing te powder is placed in an oven
at 34- 40 degree centigrade .

17.  Heating cause te release of water of
crystallization from te citric acid so dissolve
some portion of powder this cause the
softening of powder when it reached the
proper consistency it is removed from the
oven and rubbed through a sieve produced
large granules.
 Sieve 4 produce large granules sieve 8
produce medium size granules and sieve 10
produce small granules
 dry at 54 degree centigrade and placed in
tight container.

18.  The source of binding agent is not water of
crystallization from the citric acid but the
water added to alcohol as moistening agent
forming the pliable mass of granulation.
 In this method all of powder may be
anhydrous as long as water is added to the
moistening agent.

19.  Just enough liquid is added to prepare a
mass of proper consistency then the granules
are prepared and dried.