Pharmaceutical Preparations Knowledge Assessment

1. When compounding a powder containing a highly potent drug in a very small quantity (e.g., 2 mg) with a large amount of diluent, which blending method is mandatory?

Spatulation

Tumbling

Sifting

Geometric dilution

Geometric dilution is mandatory to ensure small quantities of potent drugs are uniformly distributed throughout a mixture, preventing dose inaccuracies.

Explanation

Geometric dilution is mandatory to ensure small quantities of potent drugs are uniformly distributed throughout a mixture, preventing dose inaccuracies.

2. What is the maximum volume of fluid that can be comfortably injected via the subcutaneous (SC) route?

Up to 2 ml

Up to 5 ml

Up to 10 ml

Up to 50 ml

Subcutaneous (SC) injection protocols limit single injection fluid volumes to up to 2 ml due to the limited capacity and sensitivity of the subcutaneous tissue.

Explanation

Subcutaneous (SC) injection protocols limit single injection fluid volumes to up to 2 ml due to the limited capacity and sensitivity of the subcutaneous tissue.

3. Which test is officially utilized to detect and quantify the presence of bacterial endotoxins (pyrogens) in parenteral products using horseshoe crab blood?

Rabbit pyrogen test

Limulus Amebocyte Lysate (LAL) test

Membrane filtration test

Fluid thioglycollate test

The LAL test uses horseshoe crab amebocyte lysate to detect and quantify bacterial endotoxins in parenteral products, offering a more sensitive and specific alternative to the rabbit pyrogen test.

Explanation

The LAL test uses horseshoe crab amebocyte lysate to detect and quantify bacterial endotoxins in parenteral products, offering a more sensitive and specific alternative to the rabbit pyrogen test.

4. What will happen to red blood cells if a highly hypotonic solution is accidentally administered via intravenous infusion?

Crenation (shrinking)

Hemolysis (bursting)

Agglutination (clotting)

No physical changes

Hypotonic fluids cause water to rapidly enter red blood cells via osmosis, leading to swelling and bursting (hemolysis), which is a life-threatening complication.

Explanation

Hypotonic fluids cause water to rapidly enter red blood cells via osmosis, leading to swelling and bursting (hemolysis), which is a life-threatening complication.

5. Which route of parenteral administration is injected into the vascular system and allows for 100% immediate bioavailability without first-pass metabolism?

Subcutaneous (SC)

Intramuscular (IM)

Intravenous (IV)

Intradermal (ID)

Intravenous (IV) administration yields instantaneous, 100% bioavailability by entering systemic circulation directly, bypassing all absorption barriers and first-pass metabolism.

Explanation

Intravenous (IV) administration yields instantaneous, 100% bioavailability by entering systemic circulation directly, bypassing all absorption barriers and first-pass metabolism.

6. Which viscosity-enhancing agent is commonly added to eye drops to increase ocular contact time and improve bioavailability?

Carboxymethylcellulose (CMC)

Ethylcellulose

Cellulose acetate phthalate

Magnesium aluminum silicate

CMC (along with HPMC) is a safely utilized ophthalmic polymer modifier to increase viscosity, thereby prolonging ocular contact time and improving drug bioavailability.

Explanation

CMC (along with HPMC) is a safely utilized ophthalmic polymer modifier to increase viscosity, thereby prolonging ocular contact time and improving drug bioavailability.

7. Which of the following preservatives is highly effective but strictly contraindicated in ophthalmic solutions intended for intraocular surgery?

Chlorobutanol

Benzalkonium chloride (BAK)

Phenylmercuric acetate

Methylparaben

BAK causes cellular toxicity to the internal endothelial layer of the cornea during invasive intraocular surgery, making it strictly contraindicated for such procedures.

Explanation

BAK causes cellular toxicity to the internal endothelial layer of the cornea during invasive intraocular surgery, making it strictly contraindicated for such procedures.

8. Commercial eye drops usually deliver a volume of 50 μl. To minimize systemic absorption and drug loss through the nasolacrimal duct, what instruction must be given to the patient?

Blink immediately and rapidly

Rub the eye surface gently

Apply pressure to the lacrimal punctum for 1–2 minutes

Wash the eye with warm water

Punctal occlusion (applying pressure to the inner corner of the eye) prevents drainage into the nasolacrimal duct and subsequent systemic absorption, improving ocular bioavailability.

Explanation

Punctal occlusion (applying pressure to the inner corner of the eye) prevents drainage into the nasolacrimal duct and subsequent systemic absorption, improving ocular bioavailability.

9. What is the maximum volume of fluid that a human conjunctival sac can temporarily accommodate when blinking?

7 μl

30 μl

50 μl

100 μl

The normal baseline volume of the conjunctival sac is 7 μl, but it can temporarily hold a maximum of 30 μl when blinking.

Explanation

The normal baseline volume of the conjunctival sac is 7 μl, but it can temporarily hold a maximum of 30 μl when blinking.

10. What are the three essential ingredients used in the formulation of effervescent granules to release carbon dioxide gas?

Sodium bicarbonate, citric acid, tartaric acid

Sodium carbonate, hydrochloric acid, lactose

Calcium carbonate, acetic acid, starch

Potassium bicarbonate, nitric acid, sucrose

The standard trio for effervescent granules consists of sodium bicarbonate (CO₂ source), citric acid, and tartaric acid (acid sources) to generate carbon dioxide gas.

Explanation

The standard trio for effervescent granules consists of sodium bicarbonate (CO₂ source), citric acid, and tartaric acid (acid sources) to generate carbon dioxide gas.

11. A formulation scientist wants to prepare an O/W emulsion cream that can easily be washed off from the skin. Which of the following ointment bases should be selected as the continuous phase?

Hydrophilic petrolatum

Hydrophilic ointment

White ointment

Wool fat

Hydrophilic ointment is an O/W emulsion base, making it water-removable and easily washed off from the skin.

Explanation

Hydrophilic ointment is an O/W emulsion base, making it water-removable and easily washed off from the skin.

12. Which type of pharmaceutical powder absorbs moisture from the atmosphere to the extent that it gradually liquefies into a solution?

Hygroscopic powder

Deliquescent powder

Efflorescent powder

Eutectic mixture

Deliquescent powders absorb atmospheric water until they completely dissolve into a liquid solution, unlike hygroscopic powders which only absorb moisture without liquefying.

Explanation

Deliquescent powders absorb atmospheric water until they completely dissolve into a liquid solution, unlike hygroscopic powders which only absorb moisture without liquefying.

13. According to official powder size standards, a 'Coarse Powder (10/44)' is defined as a powder that passes completely through a No. 10 sieve, with not more than ______ passing through a No. 44 sieve.

10% by weight

20% by weight

40% by weight

60% by weight

Coarse powder definitions officially state that not more than 40% by weight can pass through sieve No. 44.

Explanation

Coarse powder definitions officially state that not more than 40% by weight can pass through sieve No. 44.

14. A solid dosage form intended for insertion into the nasal cavity is known as:

Bougies

Pessaries

Burginarium

Aural cones

Nasal solid insertions are called burginarium. Bougies are urethral insertions, and pessaries are vaginal insertions.

Explanation

Nasal solid insertions are called burginarium. Bougies are urethral insertions, and pessaries are vaginal insertions.

15. Overheating cocoa butter during the fusion method will cause it to solidify into an unstable crystalline form (α-form). What is the melting point of this unstable form?

15°C to 18°C

23°C to 25°C

34°C to 35°C

40°C to 42°C

Overheated cocoa butter crystallizes into the unstable alpha (α) form, which melts at room temperature (15–18°C), making it unsuitable for suppository use.

Explanation

Overheated cocoa butter crystallizes into the unstable alpha (α) form, which melts at room temperature (15–18°C), making it unsuitable for suppository use.

16. Which suppository base does not melt at body temperature but instead relies on dissolving slowly in the mucous secretions of the body cavity?

Cocoa butter

Polyethylene glycol (PEG)

Witepsol

Suppocire

PEG bases do not melt at body temperature; they slowly dissolve in mucosal secretions, making them water-soluble bases.

Explanation

PEG bases do not melt at body temperature; they slowly dissolve in mucosal secretions, making them water-soluble bases.

17. What is the official standard weight for a rectal suppository formulated for a pediatric (infant) patient?

0.5 gram

1 gram

2 grams

3 grams

Rectal suppository weight standards are 1g for pediatric/infant patients and 2g for adults.

Explanation

Rectal suppository weight standards are 1g for pediatric/infant patients and 2g for adults.

18. When a gel stands undisturbed for days, it may shrink and express its liquid vehicle. This physical instability phenomenon is known as:

Thixotropy

Syneresis

Imbibition

Swelling

Syneresis is the shrinking of a gel matrix accompanied by the squeezing out of its liquid component upon standing undisturbed.

Explanation

Syneresis is the shrinking of a gel matrix accompanied by the squeezing out of its liquid component upon standing undisturbed.

19. What is the standard discard date (shelf-life after opening) for topical creams supplied in a jar (tubs)?

1 week

1 month

3 months

6 months

Creams packaged in jars/tubs have a discard date of 1 month after opening, whereas creams in tubes last 3 months.

Explanation

Creams packaged in jars/tubs have a discard date of 1 month after opening, whereas creams in tubes last 3 months.

20. Which of the following raw materials acts as a natural gelling agent in the preparation of single-phase hydrogels?

Carbomer 940

Methylcellulose

Tragacanth

Polyvinyl alcohol

Tragacanth is a natural gum used as a gelling agent. Carbomer is synthetic, and methylcellulose is semi-synthetic.

Explanation

Tragacanth is a natural gum used as a gelling agent. Carbomer is synthetic, and methylcellulose is semi-synthetic.

Pharmaceutical Dosage Forms & Preparations

1. When compounding a powder containing a highly potent drug in a very small quantity (e.g., 2 mg) with a large amount of diluent, which blending method is mandatory?

2.

What first name or nickname would you like us to use?

2. What is the maximum volume of fluid that can be comfortably injected via the subcutaneous (SC) route?

3. Which test is officially utilized to detect and quantify the presence of bacterial endotoxins (pyrogens) in parenteral products using horseshoe crab blood?

4. What will happen to red blood cells if a highly hypotonic solution is accidentally administered via intravenous infusion?

5. Which route of parenteral administration is injected into the vascular system and allows for 100% immediate bioavailability without first-pass metabolism?

6. Which viscosity-enhancing agent is commonly added to eye drops to increase ocular contact time and improve bioavailability?

7. Which of the following preservatives is highly effective but strictly contraindicated in ophthalmic solutions intended for intraocular surgery?

8. Commercial eye drops usually deliver a volume of 50 μl. To minimize systemic absorption and drug loss through the nasolacrimal duct, what instruction must be given to the patient?

9. What is the maximum volume of fluid that a human conjunctival sac can temporarily accommodate when blinking?

10. What are the three essential ingredients used in the formulation of effervescent granules to release carbon dioxide gas?

11. A formulation scientist wants to prepare an O/W emulsion cream that can easily be washed off from the skin. Which of the following ointment bases should be selected as the continuous phase?

12. Which type of pharmaceutical powder absorbs moisture from the atmosphere to the extent that it gradually liquefies into a solution?

13. According to official powder size standards, a 'Coarse Powder (10/44)' is defined as a powder that passes completely through a No. 10 sieve, with not more than ______ passing through a No. 44 sieve.

14. A solid dosage form intended for insertion into the nasal cavity is known as:

15. Overheating cocoa butter during the fusion method will cause it to solidify into an unstable crystalline form (α-form). What is the melting point of this unstable form?

16. Which suppository base does not melt at body temperature but instead relies on dissolving slowly in the mucous secretions of the body cavity?

17. What is the official standard weight for a rectal suppository formulated for a pediatric (infant) patient?

18. When a gel stands undisturbed for days, it may shrink and express its liquid vehicle. This physical instability phenomenon is known as:

19. What is the standard discard date (shelf-life after opening) for topical creams supplied in a jar (tubs)?

20. Which of the following raw materials acts as a natural gelling agent in the preparation of single-phase hydrogels?