PTCB Certified Pharmacy Technician (PTCE)MedicationsEasy
A pharmacy technician is preparing an oral suspension that requires the addition of a suspending agent. Which of the following is the primary purpose of a suspending agent in a liquid pharmaceutical preparation?
- ATo prevent the settling of solid particles over time.
- BTo increase the solubility of the active ingredient.
- CTo sterilize the final product.
- DTo impart a pleasant taste to the medication.
Show answer & explanationAnswer & explanation
Correct answer: A. To prevent the settling of solid particles over time.
A suspending agent is added to liquid preparations containing insoluble solid particles (a suspension) to reduce the rate of sedimentation and prevent the particles from settling too quickly or forming a hard cake at the bottom. This ensures uniform distribution of the active ingredient upon shaking.
Why the other options are wrong
- B. Solubility enhancers are used to dissolve ingredients, while suspending agents keep insoluble particles dispersed.
- C. Sterilizing agents or processes are used for sterilization, not suspending agents.
- D. Flavoring agents are used for taste, not suspending agents.
Suspending Agent
An additive in liquid pharmaceutical preparations that helps to keep insoluble solid particles uniformly dispersed, preventing rapid sedimentation and caking.
- Increases the viscosity of the vehicle.
- Often polymeric substances (e.g., cellulose derivatives, gums).
- Essential for maintaining dose uniformity in suspensions.
Memory trick: Excipients help drugs, suspending keeps particles up.