MN lec Flashcards
• inert substance added to increase tablet size or fill the capsule body
Diluent (Filler/ Bulking Agent)
a.
• Most common
• No reaction with most drugs
• Monohydrate, anhydrous, and spray-dried
Lactose
• Used as sweetener
b. Sucrose and Dextrose
• Good flow and very compressible
• Disintegrates rapidly in water
c. Microcrystalline Cellulose (Avicel®)
• Used as diluent, binder and disintegrant
• Modified Starch: Sta-Rx 1500®, Cellutab®
d. Starch
• Only inorganic salt used as diluent
e. Dibasic calcium Phosphate
• Used in chewable tablets • Negative heat of solution
f. Mannitol and xylitol
Diluent
a.Lactose
b. Sucrose and Dextrose
c. Microcrystalline Cellulose (Avicel®)
d. Starch
e. Dibasic calcium Phosphate
f. Mannitol and xylitol
• Imparts cohesiveness to powders causing them to from granules
- Binder
- Binder
a. Starch paste
b. Acacia & Tragacanth
c. Gelatin
d. Sucrose
e. Cellulose Derivatives
• Binder of choice for wet gran
a. Starch paste
• Natural guns
b. Acacia & Tragacanth
• Protein substance
c. Gelatin
• Can be used as powder or syrup
d. Sucrose
• Methyl cellulose
• Ethyl cellulose
• Carboxymethyl cellulose
• Hydroxypropyl methyl cellulose
e. Cellulose Derivatives
• Binder for chewable tablets
f. PVP
• Facilitates the breakup of a tablet when in contact with aqueous medium
Disintegrant
MOA: of disintegrant
Swelling
Wicking
Release of gas
– starch paste
• Swelling
• – MCC
Wicking
– effervescent tablets
• Release of gas
• Newer class of disintegrants which are effective at much lower levels
• Hydroscopic
- Superdisintegrant
- Superdisintegrant
a. Sodium Starch Glycolate (Explotab®, Primojel®)
b. Crospovidone
c. Croscarmellose Na
• Cross link starch polymer
a. Sodium Starch Glycolate (Explotab®, Primojel®)
• Cross link polyvinylpyrrolidone
b. Crospovidone
• Cross link cellulose derivative
c. Croscarmellose Na
Fine powders added prior to compression to reduce friction and improve flow properties
• Mostly hydrophobic and added at low concentration
- Antifrictional Agents (Flow Activators)
Reduces friction between the tablet and die wall to facilitate ejection from die cavity
Lubricant
Reduces sticking to die walls and picking by punches
Antiadherent
Reduces friction among particles to enhance the flow
Glidant
• lubricant, antiadherent and glidant
a. Stearates (Mg, Ca, Na)
• lubricant and antiadherent
b. Purified Talc
• glidant
c. Colloidal Talc
d. Colloidal SiO2 (Cab-O-Sil®)
e. Silicates (Ca and Mg)