Tablet coating is the final step in tablet production used to mask tastes, protect drugs, and control drug release. The objectives of coating include masking odors and tastes, providing physical and chemical protection, and controlling or protecting drug release. Coating considerations include tablet properties like shape and surface area, the coating process and equipment, and the coating composition of polymers, colors, plasticizers, and solvents. There are three main types of coatings: sugar coating which provides taste masking and elegance; film coating which provides a thin uniform film; and enteric coating which protects acid-labile drugs and provides site-specific delivery to the intestines.

1. TABLET COATING TECHNOLOGY
BENGAL SCHOOL OF
TECHNOLOGY
SUBJECT- Pharmaceutical
Technology
PT-506
NAME- Soumyakanti Maity
ROLL NO.- 19301916028
STREAM- B.Pharm
SEMESTER- 5th semester

2. TABLETCOATING
TABLET COATING IS THE LAST CRITICAL STEP IN THE
TABLET PRODUCTION CYCLE.
IT IS THE PHENOMENON OF APPLICATION OF COATING TO
THE TABLET.

3. OBJECTIVES OF TABLET COATING
MASK THE ODOUR, TASTE OR COLOUR OF DRUG.
PROVIDES PHYSICAL AND CHEMICAL PROTECTION OF DRUG.
CONTROL THE RELEASE OF DRUG FROM THE DRUG.
PROTECTS THE DRUG FROM GASTRIC ENVIRONMENT OF STOMACH IN CASE OF
ACID SENSITIVE DRUG.
AVOID CHEMICAL INCOMPATIBILITY.

4. COMPONENTS CONSIDEREDIN TABLET
COATING
 TABLET PROPERTIES-
a) SHAPE
b) TOLERANCE
c) SURFACE AREA
 COATING PROCESS –
a) COATING EQUIPMENT
b) COATING PARAMETERS
c) FACILITY & ANCILLARY EQUIPMENT
d) AUTOMATION OF COATING PROCESS
 COATING COMPOSITION WHICH INVOLVES POLYMERS, COLOUR, PLASTICIZER, SOLVENT.

5. TABLETPROPERTIES
TABLET TO BE COATED MUST POSSES THE PROPER PHYSICAL CHARACTERISTICS
LIKE SPHERICAL SHAPE AND UNIFORM SURFACE
TO TOLERATE ATTRITION OF TABLETS DURING COATING PROCESS THEY MUST
BE RESISTANT TO ABRASION AND CHIPPING.
AS THE TABLET SURFACES THAT ARE BRITTLE AND SOFTEN IN PRESENCE OF
HEAT OR EFFECTED BY COATING COMPOSITION AND TEND TO BECOME ROUGH
IN THE EARLY STAGES OF COATING PROCESS ARE UNACCEPTABLE FOR FILM
COATING.

8. TABLETCOATING PROCESS
THE COATING OF TABLETS CLASSIFIED INTO THREE TYPES:
I. SUGAR COATING
II. FILM COATING
III. ENTERIC COATING

9. SUGAR COATING
 IT INVOLVES THE APPLICATION OF SUGAR SOLUTION WITH COLOR FOR SEVERAL TIMES TO GIVE –
UNIFORM AND ELEGANT FILM
ADVANTAGES:
 IT PREVENTS UNPLEASANT ODOUR.
 GIVE SWEET TASTE TO TABLET BY MASKING BITTER TASTE.
 HIGHLY ELEGANT AND GLOSSED TABLETS ARE OBTAINED.

10. DURATION HOURS-FEWDAYS
SUGAR COATING INVOLVES FOLLOWING STEPS –
SEALING
SUB-COATING
SYRUPING(SMOOTHING)
FINISHING
POLISHING

11. FILMCOATING
IT IS THE PROCESS OF POLYMERIC SOLUTION TO BRING A UNIFORM FILM.
ADVANTAGES:
 FILM COATING GIVES A TABLET WITH LESS WEIGHT AND SMALL SIZE.
 THE FILM FORMED IS VERY THIN.
 IN FILM COATING ENGRAVINGS ARE POSSIBLE ON TABLET SURFACE WHICH ARE NOT
POSSIBLE IN SUGAR COATING.
 BETTER MECHANICAL STRENGTH IS OBTAINED.
 THE COST OF THE FILM COATED TABLETS IS LESS.

12. ENTERICCOATING
AN ENTERIC COATING IS A BARRIER THAT CONTROLS THE LOCATION OF ORAL
MEDICATION IN THE DIGESTIVE SYSTEM WHERE IT IS ABSORBED.
REASON FOR ENTERIC COATING:
 TO PROTECT ACID LABILE DRUGS.
 FOR OPTIMAL ABSORPTION.
 TO PREVENT GASTRIC STRESS DUE TO DRUG IRRITATION.
 TO SHOW LOCAL ACTION ON INTESTINE.
 TO PROVIDE DELAYED RELEASE

13. CONCLUSION
• HENCE WE CAN CONCLUDE THAT THE PRESENTATION ON TABLET COATING
TECHNOLOGY WAS COMPLETED BY ACCOMMODATING INFORMATION
MENTIONED IN NEXT SLIDE.

14. REFERENCE
LACHMAN/LIEBERMAN'S THE THEORY AND PRACTICE OF INDUSTRIAL PHARMACY,
FOURTH EDITION.
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