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Cathartics
• Mrs.Dipali M.Kulkarni,
• Assistant Professor,
• Yash Institute of Pharmacy,
• Aurangabad.
Cathartics:
Magnesium sulphate,
Sodium orthophosphate,
Kaolin
Bentonite
Constipation
To infrequent passage of stool that may be due to decreased motility in colon
or due to difficulty in evacuation.
Drugs:
• Laxatives
• Purgatives
• Cathartic
Types/Classification
1. Bulk purgative or bulk forming laxative:
• Act by increasing the non absorbable solid residue.
• Made from cellulose, sodium carboxyl methyl cellulose and karaya gum.
2. Stimulant purgative:
• act by local irritation on the intestinal tract which increase peristaltic activity,
motility & secretion.
• E.g. phenolphthalein, aloin, cascara extract, rhubarb extract, senna extract,
podophyllin, castor oil, bisacodyl, calomel etc.
3. Stool/Fecal Softeners or emollient laxatives or lubricants:
• act by altering the consistency of feces/stool or by facilitating the passage
of compacted stool/fecal material - easier to pass
• Promote more water & fat in the stools
• E.g. Liquid paraffin, mineral oil, d-octyl sodium sulfosuccinate, an anionic
surface active agent (detergents).
4. Osmotic purgative or saline cathartics or saline purgative
• Saline cathartics act by increasing the osmotic load of the GIT (retain water
osmotically).
• They are salts of poorly absorbable anions H2PO4 - (biphosphate), HPO4
2- (phosphate), sulphates, tartarates, and soluble magnesium salt.
• Saline cathartics are water soluble and are taken with large quantities of
water.
• They act in the intestine and a full cathartic dose produces a water
evacuation within 3-6 hrs.
Because of their quick onset of action they are given early in the morning
before breakfast.
• They are used for bowel evacuation before radiological, endoscopic and
surgical procedures and also to expel parasite and toxic materials.
• Small amounts of these drugs may be absorbed in the blood causing
occasional toxicity.
• The absorption of magnesium may cause marked CNS depression while
that of sodium worsens the existing congestive cardiac failure (CCF)
Magnesium
sulphate
• I.P. limit: It
contains not less
than 99.0% and not
more than 100.5% of
magnesium
sulphate.
• Properties: It
forms colorless
prismatic crystals. It
dissolves in water, is
practically insoluble
in
alcohol. It has
cooling saline bitter
taste.
• Preparation:
1) It can be prepared
by neutralizing hot
dilute
sulphuric acid with
magnesium or its
oxides or
carbonate. The
solution is filtered;
the filtrate is
concentrated and
recrystallized
prepared from magnesium oxide.
This is obtained by the thermal decomposition of: magnesium
hydroxide (obtained from sea water):
Mg(OH)2(s) → MgO(s) + H2O(g)
• magnesium carbonate (from the ore magnesite):
MgCO3(s) → MgO(s) + CO2(g)
• In either case, the oxide is reacted with sulfuric acid to produce
magnesium sulphate:
MgO(s) + H2SO4(aq) → MgSO4(aq)
Assay:
Weigh accurately
about 6.3gm of
sample dissolve in
50ml of water,
add 10ml of strong
ammonia
ammonium chloride
solution and
titrate with 0.05M
disodium EDTA
using 0.1gm of
moderate black II
mixture as indicator
until blue color is
obtained.
• Each ml of 0.05M
disodium EDTA≡
0.00602 gm of
MgSO4
Uses: It is used as
osmotic laxative,
in treatment of
electrolyte
deficiency,
in wet dressing in
boils,
in treatment of sea
sickness,
hypertension etc.
Sodium orthophosphate
• Properties: NaH3O4P + white odorless crystals, granules or a crystalline powder,
available in hydrated forms. Soluble in water
• Identification Test:
• Sodium: to a solution of sample add 1 ml of acetic acid and 1 ml of uranyl zinc
acetate.
A yellow crtystalline precipitate is formed within a few min.
• Phosphate: to 5 ml of solutoin add 1 ml of conc. nitric acid and 5 ml of
ammonium molybdate and warm.
A bright canary yellow precipitate is obtained
• Orthophosphate: acidify small amt of sample with dil. Acetic acid and add 1 ml of
silver nitrate.
A yellow precipitate is formed
Kaolin
• Kaolin is categorised as light kaolin, light kaolin (natural), heavy kaolin (china
clay).
• Light kaolin is used internally as adsorbent, it is a native hydrated aluminium
silicate. It contains a suitable dispersing agent.
Properties: white, odourless, tasteless powder ointment like (soft) to touch.
• It is insoluble in water, mineral acids & alkali hydroxides solutions.
Uses: Adsorbent for toxic substances form the GIT As dusting powders, toilet
powders and as filtering aid.
Ref: Concise Inorganic Pharmaceutical Chemistry, by Dr K R Mahadik
Bentonite
• Bentonite is widely known for its high swelling characteristics occurs as a
very fine buff or cream coloured powder.
• It is odourless, free from grit and has slightly an earthy taste.
• A typical bentonite is almost insoluble in water and has the ability to
absorb 4-5 times its own weight in water and can swell 5 - 15 times its dry
volume at full-unconfined saturation.
• It neither dissolves nor swells in organic solvents.
• Chemical composition: Al2O3.4(SiO2). H2O i.e., aluminium phyllosilicate
clay
• Uses:
As a bulk laxative, desiccant, base for many dermatologic formulas, emulsifier for oil in
water emulsion, granular bentonite is being studied for use in wound dressings and
bentonites are used for decolorizing various mineral, vegetable and animal oils.
• They are also used for clarifying wine, liquor, cider, beer and vinegar and also as a
lubricant to cool the cutting tools.
• Types/available forms: Sodium bentonite, Calcium bentonite and Potassium
bentonite
• The Free Swell test procedure is used to determine the general swelling
characteristics of bentonite.
• *Refer practical manual for Free Swell test.
Assay: Weigh accurately
4gm of substance
dissolve in 25ml of water
add
25ml 1N HCl and
titrate
potentiometrically with
1M NaOH to first
inflection point of the
pH curve (n1)
continue titration until
second inlfection of
curve is reached.
The total volume of
NaOH required is n2 ml.
calculate percent
content from the
expression
• 1420(25-n1)/w (100-d)
d is percentage of water
content.
Uses: • Widely used as
saline cathartic.
• It is a pharmaceutical
aid used as buffering
agent.

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Catheratics

  • 1. Cathartics • Mrs.Dipali M.Kulkarni, • Assistant Professor, • Yash Institute of Pharmacy, • Aurangabad.
  • 3. Constipation To infrequent passage of stool that may be due to decreased motility in colon or due to difficulty in evacuation. Drugs: • Laxatives • Purgatives • Cathartic
  • 4. Types/Classification 1. Bulk purgative or bulk forming laxative: • Act by increasing the non absorbable solid residue. • Made from cellulose, sodium carboxyl methyl cellulose and karaya gum. 2. Stimulant purgative: • act by local irritation on the intestinal tract which increase peristaltic activity, motility & secretion. • E.g. phenolphthalein, aloin, cascara extract, rhubarb extract, senna extract, podophyllin, castor oil, bisacodyl, calomel etc.
  • 5. 3. Stool/Fecal Softeners or emollient laxatives or lubricants: • act by altering the consistency of feces/stool or by facilitating the passage of compacted stool/fecal material - easier to pass • Promote more water & fat in the stools • E.g. Liquid paraffin, mineral oil, d-octyl sodium sulfosuccinate, an anionic surface active agent (detergents). 4. Osmotic purgative or saline cathartics or saline purgative • Saline cathartics act by increasing the osmotic load of the GIT (retain water osmotically). • They are salts of poorly absorbable anions H2PO4 - (biphosphate), HPO4 2- (phosphate), sulphates, tartarates, and soluble magnesium salt. • Saline cathartics are water soluble and are taken with large quantities of water. • They act in the intestine and a full cathartic dose produces a water evacuation within 3-6 hrs.
  • 6. Because of their quick onset of action they are given early in the morning before breakfast. • They are used for bowel evacuation before radiological, endoscopic and surgical procedures and also to expel parasite and toxic materials. • Small amounts of these drugs may be absorbed in the blood causing occasional toxicity. • The absorption of magnesium may cause marked CNS depression while that of sodium worsens the existing congestive cardiac failure (CCF)
  • 7. Magnesium sulphate • I.P. limit: It contains not less than 99.0% and not more than 100.5% of magnesium sulphate. • Properties: It forms colorless prismatic crystals. It dissolves in water, is practically insoluble in alcohol. It has cooling saline bitter taste. • Preparation: 1) It can be prepared by neutralizing hot dilute sulphuric acid with magnesium or its oxides or carbonate. The solution is filtered; the filtrate is concentrated and recrystallized
  • 8. prepared from magnesium oxide. This is obtained by the thermal decomposition of: magnesium hydroxide (obtained from sea water): Mg(OH)2(s) → MgO(s) + H2O(g) • magnesium carbonate (from the ore magnesite): MgCO3(s) → MgO(s) + CO2(g) • In either case, the oxide is reacted with sulfuric acid to produce magnesium sulphate: MgO(s) + H2SO4(aq) → MgSO4(aq)
  • 9. Assay: Weigh accurately about 6.3gm of sample dissolve in 50ml of water, add 10ml of strong ammonia ammonium chloride solution and titrate with 0.05M disodium EDTA using 0.1gm of moderate black II mixture as indicator until blue color is obtained. • Each ml of 0.05M disodium EDTA≡ 0.00602 gm of MgSO4 Uses: It is used as osmotic laxative, in treatment of electrolyte deficiency, in wet dressing in boils, in treatment of sea sickness, hypertension etc.
  • 10. Sodium orthophosphate • Properties: NaH3O4P + white odorless crystals, granules or a crystalline powder, available in hydrated forms. Soluble in water • Identification Test: • Sodium: to a solution of sample add 1 ml of acetic acid and 1 ml of uranyl zinc acetate. A yellow crtystalline precipitate is formed within a few min. • Phosphate: to 5 ml of solutoin add 1 ml of conc. nitric acid and 5 ml of ammonium molybdate and warm. A bright canary yellow precipitate is obtained • Orthophosphate: acidify small amt of sample with dil. Acetic acid and add 1 ml of silver nitrate. A yellow precipitate is formed
  • 11. Kaolin • Kaolin is categorised as light kaolin, light kaolin (natural), heavy kaolin (china clay). • Light kaolin is used internally as adsorbent, it is a native hydrated aluminium silicate. It contains a suitable dispersing agent. Properties: white, odourless, tasteless powder ointment like (soft) to touch. • It is insoluble in water, mineral acids & alkali hydroxides solutions. Uses: Adsorbent for toxic substances form the GIT As dusting powders, toilet powders and as filtering aid. Ref: Concise Inorganic Pharmaceutical Chemistry, by Dr K R Mahadik
  • 12. Bentonite • Bentonite is widely known for its high swelling characteristics occurs as a very fine buff or cream coloured powder. • It is odourless, free from grit and has slightly an earthy taste. • A typical bentonite is almost insoluble in water and has the ability to absorb 4-5 times its own weight in water and can swell 5 - 15 times its dry volume at full-unconfined saturation. • It neither dissolves nor swells in organic solvents. • Chemical composition: Al2O3.4(SiO2). H2O i.e., aluminium phyllosilicate clay
  • 13. • Uses: As a bulk laxative, desiccant, base for many dermatologic formulas, emulsifier for oil in water emulsion, granular bentonite is being studied for use in wound dressings and bentonites are used for decolorizing various mineral, vegetable and animal oils. • They are also used for clarifying wine, liquor, cider, beer and vinegar and also as a lubricant to cool the cutting tools. • Types/available forms: Sodium bentonite, Calcium bentonite and Potassium bentonite • The Free Swell test procedure is used to determine the general swelling characteristics of bentonite. • *Refer practical manual for Free Swell test.
  • 14. Assay: Weigh accurately 4gm of substance dissolve in 25ml of water add 25ml 1N HCl and titrate potentiometrically with 1M NaOH to first inflection point of the pH curve (n1) continue titration until second inlfection of curve is reached. The total volume of NaOH required is n2 ml. calculate percent content from the expression • 1420(25-n1)/w (100-d) d is percentage of water content. Uses: • Widely used as saline cathartic. • It is a pharmaceutical aid used as buffering agent.