Help
Options
Didn't know it?
click below
click below
Knew it?
click below
click below
Don't Know
Remaining cards (0)
Know
retry
shuffle
restart
0:00
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.
Normal Size Small Size show me how
Normal Size Small Size show me how
Powders 1
Powders 1 - DDS II
| Question | Answer |
|---|---|
| Using ___________ rather than __________ decreases the rate of solution and prevents uncontrollable effervescence. | Granules; powders |
| Benzoic acids is a(n) ______________. | Antifungal |
| Powders to be dissolved in water include: | Antacids and laxatives, Dietary/food supplement, Douche powders |
| When oxidizing agents are triturated in a mortar with a reducing agent, what may occur? | A violent explosion |
| What are prepared aggregates of powdered materials, forming larger particle (2-4 mm) called? | Granules |
| Compared to powders, what kind of flow properties do granules have? | Good flow properties? |
| What type of containers should be used for powders? | Glass or plastic containers |
| A desirable property of a powder is that it should be ___________ and should easily __________ on the surface of the skin. | Free flowing; spread |
| Why are oral antibiotics prepared in powder or granules? | For stability |
| Which will have a faster onset, a tablet or a powder? | Powder |
| What method is used to reduce the particle size of insoluble materials when compounding ointments and suspensions? | Levigation |
| Salicylate is a(n) ______________. | Keratolytic |
| A dry mixture of sodium bicarbonate, citric acid and tartaric acid is what kind of granule? | Effervescent |
| Chartule is an example of ______________. | Divided powders |
| Insufflators are used for ______________. | Delivering a stream of powder |
| Particle size of a powder has an influence on what (5 items)? | Dissolution rate; Suspendability or rate of settling; Uniform distribution; Penetrability of powders in inhalation solutions; Topical preparations |
| Powders used to clean the teeth are called ___________. | Dentifrices |
| Substances which become powdery and liberate their water of crystallization are called ______________. | Efflorescent |
| What kind of powders are intended for topical use? | Dusting powders |
| Why do powders have a faster onset of therapeutic benefit? | Disintegration is not required |
| Substances which absorb moisture from the air to the extent that they liquefy by partially or wholly forming solution are called ___________. | Deliquescent |
| The process of particle size reduction is called ____________. | Comminution |
| The most common acids used for effervescent granules are ________ (4). | Citric acid, Tartaric acid, Malic acid, Sodium dihydrogen phosphate |
| What is liberated from a mixture of sodium bicarbonate, citric acid and tartaric acid when the mixture is added to water? | Carbon dioxide |
| How can the problem of an efflorescent powder becoming pasty due to liberation of water be overcome? | By using the corresponding anhydrous salt. |
| How is an eutectic mixture recognized? | By the liquefaction of two or more substances upon admixture |
| How can the formation of an eutectic mixture be avoided when dispensing components that will form a euctectic mixture? | By taking one powder of each kind as a dose |
| How is the bioavailability of a powder enhanced? | By reducing particle size |
| How are granules prepared? | By moistening the desired powder and passing through desired sieves, then dried. |
| In what three forms can powders be prepared? | Bulk powders, divided powders, or granules |
| Antacids would be an example of a(n) ______________ (divided powder / bulk powder). | Bulk powder |
| How can oxidizing agents be mixed with reducing agents without causing a violent explosion? | Both substances should be triturated separately and then combined with other ingredients and gently mixed |
| Zinc oxide is a(n) ___________ and a(n) _________. | Astringent, adsorbent |
| An intimate mixture of dry, finely divided drugs and/or chemicals that are intended for internal or external use describes a __________. | Powder |
| A unifrom sedimentation rate if the powder is used in a suspension is an advantage of ___________. | Uniform particle size |
| Calcium carbonate is a(n) ___________ and a(n) _________. | Astringent, adsorbent |
| Camphor is a(n) _______________. | Antipruritic |
| What size sieve range are granules usually in? | 4-12 sieve size |
| Once an oral antibiotic is reconstituted, what is its shelf life? | 1-2 weeks |
| When citric acid and tartaric acid are used in combination in an effervescent granule, what ration is used? | 1:2 (citric acid:tartaric acid) |
| What are the advantages of a uniform particle size? | 1. Insures a uniform dissolution rate for dissolving; 2. Inures a uniform sedimentation rate if used in suspension; 3. Minimal stratification when powders are stored or transported. |
| What is the general range of sizes for a powder? | 0.1 to 10 micron in size |
| What are two requirements for dusting powders? | (1) Must be homogenous, and (2) must be free from potential local irritation |
| Define absorptive. | The uptake of liquid into the fibers of a substance. |
| What can happen if the particles size distribution of a powder is not uniform? | The powder can segregate according to the different particle sizes which may result in inaccurate dosing or inconsistent performance. |
| The fact that it can be administered easily to infants and young children who cannot swallow tablets or capsules is an advantage of _________. | Powders |
Created by:
P1StudyStack