4 - Acetaminophen Flashcards

1
Q

What is MOA of acetaminophen and what is it used for?

A
  • Analgesic/ antipyretic that inhibits prostaglandin synthesis
  • Elevates pain threshold
  • Acts on hypothalamic heat-regulating center
  • Used for MSK pain, earache, LBP, arthritis, dysmenorrhea, myalgia, infections
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

Is acetaminophen or ASA stronger in regards to analgesic and antipyretic effects?

A

Both are considered equipotent

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

Advantages of tablets over other dosage forms to manufacturers

A
  • Economy
  • Stability
  • Convenience
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

Advantages of tablets over other dosage forms to consumers

A
  • Accuracy
  • Portability
  • Convenience
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

What are some excipients found in tablets?

A
  • Diluents
  • Binders
  • Lubricants
  • Disintegrants
  • Glidants
  • Colorants
  • Flavouring agents
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

Purpose and examples of diluents

A
  • Increase tablet mass for compression

- Ex: lactose, cellulose, mannitol, starch

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

Purpose and examples of binders

A
  • Improve free-flowing qualities of granules for desired hardness
  • Ex: starch, gelatin, sugars (sucrose, glucose, dextrose), acacia
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

Purpose and examples of lubricants

A
  • Prevent adhesion to dies/punches, reduce friction, facilitate ejection
  • Ex: talc, magnesium stearate, PEG
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

Purpose and examples of disintegrants

A
  • Absorb water rapidly to increase size afterwards, so tablets can disintegrate after administration
  • Ex: starch, cellulose
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

Purpose of glidants

A

Improve flow characteristics of a powder mixture

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

Purpose of colorants

A

Provide appealing appearance

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

What is used in controlled release tablets that is unique?

A

Specific polymers or coating materials

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

What is the most popular tableting procedure?

A

Wet granulation

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

Describe wet granulation

A
  • Weighing
  • Mixing
  • Granulating
  • Wet screening
  • Drying
  • Dry screening
  • Lubricating
  • Compressing
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

Describe fluid-bed granulation

A
  • Weighing

- Mixing, granulating, and drying processed in a single piece of equipment

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

What is special about dry granulation?

A
  • No granulation fluid so no moisture

- High temperature is applied

17
Q

What is special about direct compression?

A
  • Most recent

- Mixing and compressing with shortened processing time/cost

18
Q

What characteristics describe a tablet?

A
  • Tablet size, shape, thickness, weight
  • Hardness
  • Drug content and uniformity
  • Drug disintegration and dissolution
19
Q

When is tablet hardness measured?

A

Throughout the tableting process

20
Q

Why can’t a tablet be too hard or soft?

A
  • Too hard = may not meet disintegration and/or dissolution requirements
  • Too soft = won’t withstand handling conditions during subsequent processing
21
Q

What determines tablet hardness?

A

Resistance to chipping, abrasion, or breakage during storage, transportation, and handling

22
Q

What is tablet friability?

A

Ability of the tablet to withstand abrasion during packaging, handling, and shipping

23
Q

When is tablet friability measured?

A

On finished products

24
Q

Which tablets normally are tested for content uniformity?

A

Those w/ small amounts of active ingredients or have small tablet weight

25
What is disintegration?
How fast a tablet breaks into small particles once in contact w/ a medium
26
Does in vitro disintegration correlate w/ in vivo?
Not always
27
What is tablet disintegration used to measure?
Batch-to-batch reproducibility
28
Which tablets require disintegration testing?
- Compressed, film-coated, enteric-coated, buccal, sublingual, soft/hard gelatin caps - Controlled release don’t require disintegration testing
29
Is dissolution or disintegration more important for solid dosage forms?
Dissolution
30
What is dissolution?
- Amount of time required for a given percentage of drug substance in a tablet to go into solution under specific conditions - Determines availability of an active ingredient
31
What other formulations besides oral dosage forms can undergo dissolution testing?
Transdermal, suppositories, ointments
32
What excipients were used w/ acetaminophen for this experiment and what is the purpose of each?
- Lactose = diluent - Avicel = binder - Explotab = disintegrant - Magnesium stearate and talc = lubricant - Granulating solution (10% PVP solution or 10% starch paste) = binder
33
Which tests were performed on the tablets for this experiment?
- Hardness (10 tablets) using portable hardness tester - Friability (10 tablets) in a tablet friability apparatus - Weight uniformity (10 tablets) weighed them and recorded the average - Tablet content (10 tablets) - Dissolution
34
How was tablet content tested?
- Weigh 10 tablets and find average tablet weight and grind in mortar - Weigh aliquot equivalent to 50 mg and dilute to 200 mL w/ distilled water - Filter and pipette 1 mL of filtrate into 25 mL volumetric flask and dilute w/ distilled water - Record absorbance at 249 nm w/ distilled water as blank
35
How was tablet dissolution measured?
- Place 1 tablet in 900 mL distilled water at 50 rpm for 30 min - Withdraw 2 mL at 15 and 30 min and filter (replenish) - Pipette 1 mL of the original dissolution solution into a 25 mL flask and dilute with water - Measure absorbance at 249 nm and calculate content