GPAT, NIPER, Pharmacist Exams Level MCQs on Suppositories: Definition, Types, Advantages & Disadvantages, Methods of Preparation

1. Suppositories designed for administration through the urethra are called:

A. Bougies

B. Troches

C. Inserts

D. Pessaries

Answer: A.

Explanation:
Bougies are urethral suppositories, specifically designed for insertion into the urethra.

• Troches are lozenges meant to dissolve in the mouth.

• Inserts are solid dosage forms placed into body cavities (like vaginal inserts).

• Pessaries are vaginal suppositories.

2. Which statement about suppositories is most accurate?

A. They are always intended for systemic action.

B. They may produce both local and systemic effects.

C. They are prepared exclusively with cocoa butter.

D. They are unsuitable for pediatric patients.

Answer: B.

Explanation:

• Suppositories can act locally (e.g., rectal suppositories for constipation, vaginal suppositories for infections) or systemically (e.g., rectal suppositories for fever or pain relief).

• They are not limited to cocoa butter; other bases like polyethylene glycol or glycerinated gelatin are also used.

• They are suitable for pediatric patients, especially when oral administration is difficult.

• They are not always systemic—many are designed for local therapeutic action.

3. The major advantage of rectal suppositories for drug delivery into the systemic systems is

A. Faster dissolution than IV injection
B. Complete avoidance of hepatic metabolism
C. Partial avoidance of first-pass metabolism
D. Increased gastric irritation

Answer: C.

Explanation:

• Rectal suppositories can bypass part of the liver’s first-pass metabolism because drugs absorbed via the lower rectum enter systemic circulation directly through the inferior and middle rectal veins.

• However, absorption from the upper rectum still drains into the portal vein, so hepatic metabolism is only partially avoided, not completely.

• They do not increase gastric irritation—in fact, they are often used when oral administration irritates.

• They are not faster than IV injection, which delivers drugs directly into the bloodstream.

• They are useful when oral administration is impractical (e.g., vomiting, unconscious patients).

Trap: Many students select “complete avoidance.” Lower hemorrhoidal veins bypass the portal circulation only partially.

4. Which dosage form is designed to be inserted into the vagina?

A. Cachet
B. Bougie
C. Pessary
D. Troche

Answer: C. Pessary

5. Which suppository base melts at body temperature but is prone to polymorphism?

A. Polyethylene glycol (PEG)

B. Glycerinated gelatin

C. Cocoa butter

D. Agar

Answer: C.

Explanation:

• Cocoa butter (Theobroma oil) is the classic suppository base that melts at body temperature, making it ideal for drug release.

• However, it exhibits polymorphism—meaning it can solidify into different crystalline forms with varying melting points. This can affect stability and drug release if not carefully controlled.

• PEG bases dissolve rather than melt, so they don’t rely on body temperature.

• Glycerinated gelatin is used mainly for vaginal suppositories and dissolves slowly.

• Agar is not a common suppository base.

6. Which of the following is suppositories DISADVANTAGE?

A. Useful for pediatric administration
B. Avoidance of gastric irritation
C. Poor patient acceptability in some individuals
D. Useful in vomiting patients

Answer: C. Poor patient acceptability in some individuals

Explanation:

• Advantages: Suppositories are helpful for pediatric patients, avoid gastric irritation, and are useful when patients cannot take oral medications (e.g., vomiting).

• Disadvantage: Some individuals find suppositories uncomfortable, inconvenient, or culturally unacceptable, leading to poor patient compliance.

7. Which suppository base generally does not require refrigeration?

A. Cocoa butter

B. Theobroma oil

C. Polyethylene glycol (PEG) base

D. Glycerinated gelatin

Correct Answer: C.

Explanation:

• PEG bases are stable at room temperature and do not melt at body temperature; instead, they dissolve slowly in body fluids. Because of this, they generally do not require refrigeration.

• Cocoa butter (Theobroma oil) must be refrigerated to prevent softening and polymorphic changes.

• Glycerinated gelatin suppositories can absorb moisture and may need cool storage.

• Theobroma oil is simply another name for cocoa butter, so it shares the same refrigeration requirement.

8. The suppository preparation by fusion method is also known as:

A. Cold shaping
B. Pour molding
C. Compression molding
D. Hand rolling

Correct Answer: B.

Explanation:

• The fusion method (pour molding) involves melting the suppository base, incorporating the drug, and then pouring the mixture into molds to solidify.

• Compression molding uses pressure to form suppositories without melting the base.

• Hand rolling is a simple, manual technique used rarely today.

• Cold shaping is another older method, not commonly used in modern practice.

9. Which method to prepare a suppository is MOST suitable for thermolabile drugs?

A. Fusion molding
B. Pour molding
C. Compression molding
D. Automatic molding

Answer: C.

Explanation:

• Compression molding is ideal for thermolabile drugs because it does not require heating the base. The drug and base are compressed into molds under pressure to avoid heat-induced degradation.

• Fusion molding / pour molding involves melting the base, which can destroy heat-sensitive drugs.

• Automatic molding is a mechanized version of fusion molding and, therefore, also involves heat.

• Therefore, compression molding is the safest choice for drugs that are unstable at elevated temperatures.

10. The hand rolling method of suppository preparation is generally preferred when:

A. Small quantity preparation is required

B. PEG base is used exclusively

C. Large-scale production is needed

D. Thermostable drugs are used

Answer: A.

Explanation:

• Hand rolling is a simple, manual technique used when only a few suppositories are needed, such as in compounding pharmacies or individualized prescriptions.

• It is not suitable for large-scale production because it lacks precision and efficiency.

• It is not specifically tied to PEG bases or thermostable drugs—those considerations are more relevant to fusion or compression molding.

• Its main advantage is practicality for small batch preparation.

11. State WATER-SOLUBLE suppository base.

A. Witepsol
B. Hydrogenated vegetable oil
C. Polyethylene glycol (PEG)
D. Cocoa butter

Answer: C.

Explanation:

• PEG bases are water‑soluble and dissolve slowly in body fluids rather than melting at body temperature. This makes them stable at room temperature and less dependent on refrigeration.

• Cocoa butter (Theobroma oil) and Witepsol are fatty bases that melt at body temperature and are not water‑soluble.

• Hydrogenated vegetable oils are also lipid‑based, designed to melt rather than dissolve.

• Thus, PEG is the classic example of a water‑soluble suppository base.

12. The displacement value (In suppositories) is defined as:

A. Suppositories: Weight variation
B. Number of the drug parts displacing the base one part
C. Medicament Volume occupation
D. One part of the drug displaces the weight of the base.

Answer: B.

Explanation:

• Displacement value is a key concept in suppository formulation. It represents how much of the base is displaced by a given amount of drug.

• This helps pharmacists calculate the correct amount of base required when incorporating active ingredients.

• It is not about volume alone, nor about weight variation, but specifically the weight of base displaced by one part of the drug.

13. Which method is MOST preferred for suppositories' industrial-scale manufacturing?

A. Manual compression
B. Hand rolling
C. Automatic molding
D. Fusion molding

Answer: C.

Explanation:

• Automatic molding is the preferred method for large‑scale industrial production because it is efficient, precise, and capable of producing uniform suppositories in bulk.

• Hand rolling is only suitable for small‑quantity compounding.

• Fusion molding is practical for pharmacy‑level preparation but not efficient for industrial scale.

• Manual compression is also limited to small batches and lacks automation.

14. Glycerinated gelatin suppositories are usually:

A. Hygroscopic in nature
B. Volatile in nature
C. Effervescent in nature
D. Lipophilic in nature

Answer: B.

Explanation:

• Glycerinated gelatin suppositories are mainly used for vaginal administration.

• They are hygroscopic, meaning they absorb moisture from the environment. This property requires them to be stored in tightly closed containers to prevent drying or hardening.

• They are not lipophilic (that applies to fatty bases like cocoa butter).

• They are not volatile or effervescent.

15. Which of the following is a CORRECT statement for cocoa butter?

A. Soluble in rectal fluid rapidly
B. Melts quickly at room temperature
C. Prone to polymorphic transition
D. Hydrophilic Property

Answer: C.

Explanation:

• Cocoa butter (Theobroma oil) is a classic fatty suppository base that melts at body temperature, not at room temperature.

• It does not dissolve in rectal fluid—instead, it melts to release the drug.

• It is lipophilic, not hydrophilic.

• Its key drawback is polymorphism: it can solidify into different crystalline forms with varying melting points, which may affect drug release and stability.

16. A rectal suppository for adults generally weighs :

A. Approximately 250 mg
B. Approximately 455 mg
C. 1–2 g
D. 5–15 g

Answer: C.

Explanation:

• Adult rectal suppositories typically weigh about 2 g, though the range is usually 1–2 g depending on formulation and base.

• Pediatric rectal suppositories are smaller, usually around 1 g.

• 250 mg and 455 mg are far too small for rectal suppositories.

• 5–15 g is far too large and more in line with certain vaginal or rectal preparations for special cases, not standard adult rectal suppositories.

17. Rapid cooling in fusion molding of suppositories leads to:

A. Increase in elasticity
B. Increased Brittleness
C. Increase in dissolution
D. Uniform polymorphism

Answer: B.

Explanation:

• In fusion molding, the base is melted, mixed with the drug, and poured into molds.

• If the suppositories are cooled too rapidly, the crystalline structure becomes irregular, leading to brittleness and poor mechanical strength.

• Proper slow cooling ensures uniform solidification and prevents polymorphic changes, giving the suppositories better elasticity and stability.

• Rapid cooling does not improve dissolution or polymorphism control—it mainly causes fragility.

18. Which of the following statements regarding compression molding is TRUE?

A. Heating required
B. Drug dissolution in molten base
C. Most suitable for heat-sensitive drugs
D. Mold Lubrication is unnecessary

Answer: C.

Explanation:

• Compression molding does not require heating the base. Instead, the drug is mixed with the suppository base in solid form and compressed into molds under pressure.

• This makes it especially useful for thermolabile (heat‑sensitive) drugs, which could degrade if exposed to melting temperatures in fusion molding.

• In contrast, fusion molding requires heat to melt the base and dissolve or disperse the drug.

• Lubrication of molds is often necessary to ensure smooth removal of suppositories, so option D is incorrect.

19. Name the suppository base that absorbs moisture under humid conditions.

A. Hydrogenated oil
B. PEG
C. Glycerinated gelatin
D. Cocoa butter

Answer: C.

Explanation:

• Glycerinated gelatin suppositories are hygroscopic, meaning they readily absorb moisture from the environment. This property makes them prone to drying or hardening if not stored properly, so they must be kept in tightly closed containers.

• Cocoa butter and hydrogenated oils are fatty bases that melt at body temperature but do not absorb moisture.

• PEG bases are water‑soluble but are relatively stable under humid conditions compared to glycerinated gelatin.

• Thus, glycerinated gelatin is the base most affected by humidity.

20. The primary reason to calculate the displacement value is:

A. To improve dissolution rate
B. To determine the suppository base quantity required
C. To prevent the growth of microbes
D. To increase the suppository hardness

Answer: B.

Explanation:

• Displacement value tells us how much of the base is displaced by a given amount of drug.

• This is crucial for calculating the exact quantity of base needed when preparing suppositories, ensuring uniform weight and drug content.

• It is not related to dissolution rate, microbial growth prevention, or hardness—those depend on other formulation factors.

21.

Assertion (A): Polyethylene glycol (PEG) suppositories are most suitable for tropical climates.

Reason (R): Polyethylene glycol (PEG) bases have higher melting points and do not melt at room temperature.

A. Both A and R are true, and R is the correct explanation
B. Both A and R are true, but R is not the correct explanation
C. A is true, R is false
D. A is false, R is true

Answer: A

Explanation:

• PEG (Polyethylene glycol) bases are water‑soluble and have relatively high melting points.

• Unlike fatty bases (e.g., cocoa butter), PEG suppositories do not melt at room temperature, making them ideal for hot/tropical climates where storage stability is a concern.

• Therefore, both the assertion and the reason are true, and the reason correctly explains the assertion.

22. Assertion (A): Compression molding is suitable for thermolabile drugs.

Reason (R): Compression molding does not require heating during preparation.

A. Both true and R explain A
B. Both true, but R does not explain A
C. A true, R false
D. A false, R true

Answer: A

Explanation:

• Compression molding involves mixing the drug with the suppository base in solid form and compressing it into molds under pressure.

• Since no heating is required, this method is especially suitable for thermolabile (heat‑sensitive) drugs, which could degrade if exposed to melting temperatures in fusion molding.

• Therefore, both the assertion and the reason are correct, and the reason directly explains why compression molding is appropriate for thermolabile drugs.

23. Assertion (A): Cocoa butter suppositories exhibit fat blooming.

Reason (R): Cocoa butter shows polymorphism.

A. Both true and R explain A
B. Both true, but R does not explain A
C. A true, R false
D. Both false

Answer: A

Explanation:

• Fat blooming refers to the whitish, mottled appearance that develops on cocoa butter suppositories when they recrystallize improperly.

• This occurs because cocoa butter is polymorphic—it can solidify into different crystalline forms with varying melting points.

• Improper cooling or storage can cause a transition to less stable polymorphs, leading to fat blooming.

• Therefore, both the assertion and the reason are true, and the reason correctly explains the assertion

Match the Following (Memory-Based Pattern)

24. Match List I with List II:

List I List II

A. Bougies 1. Vaginal

B. Pessaries 2. Urethral

C. PEG 3. Water-soluble base

D. Cocoa butter 4. Fatty base

A. A-2, B-1, C-3, D-4
B. A-1, B-2, C-4, D-3
C. A-3, B-4, C-1, D-2
D. P-2, Q-3, R-1, S-4

Answer: A

Case-Based MCQ

25. A suppository containing a heat-sensitive medicament with minimal risk of polymorphic changes in the base. A pharmacist needs to prepare a suppository. Which method and base combination is MOST suitable?

A. Fusion molding using cocoa butter
B. Compression molding using PEG
C. Hand rolling using cocoa butter
D. Fusion molding using glycerinated gelatin

Answer: B.
Explanation:

• Compression molding is ideal for thermolabile (heat‑sensitive) drugs because it avoids heating the base.

• PEG (Polyethylene glycol) is a water‑soluble base with a stable crystalline structure, so it does not undergo polymorphic transitions like cocoa butter.

• Fusion molding with cocoa butter risks polymorphic changes and requires heating, which can degrade heat‑sensitive drugs.

• Hand rolling is imprecise and not suitable for medications requiring accurate dosing.

• Fusion molding with glycerinated gelatin involves heating and is not appropriate for heat‑sensitive drugs.

Frequently Asked Questions on Suppositories

• Displacement Value: How are displacement values calculated, and why are they important?

• Cocoa Butter Polymorphism: What forms of cocoa butter exist, and how does polymorphism affect suppository stability?

• Preparation Methods: What are the main methods of preparing suppositories, and how do they compare?

• Base Comparison: PEG vs Fatty Bases What are the differences between polyethylene glycol (PEG) bases and fatty bases?

• Clinical Advantages: Why are suppositories particularly useful in pediatric patients or those experiencing vomiting?

• Evaluation Tests: What tests are used to evaluate the quality and performance of suppositories?

• Hygroscopicity of Glycerinated Gelatin: How does hygroscopicity affect glycerinated gelatin suppositories?

Dr. Alok Singh