pharmacy calculation

Started by mary mar
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mary mar

Full Member
7+ Year Member
hi.. i have a question .. if you wanna make a cream of 30gm in such if you dispense 1.5 gm of it it will contain 10% of medication ?? how you gonna make it???
( in my opinion if make 1000 gm of cream with concentration of 10% ... whether you dispense 1.5gm or 10gm the dose will have a concentration of 10% .. is this right ??)
 
Think about it it, you have Clobetasol cream 0.05%. If I take a pea size amount, or I squeeze out the entire tube, the concentration of active ingredient is the same throughout.
 
farmadiazepine said:
Yes, you are right with your example. If you make 10% cream, no matter what quantity you make of it, whatever portion you take out of it will always be 10%.
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Yeeeesss...thank you .. Can you give me a reference book that contains such calculation to support my opinion ??
 
farmadiazepine said:
Think about it it, you have Clobetasol cream 0.05%. If I take a pea size amount, or I squeeze out the entire tube, the concentration of active ingredient is the same throughout.
Click to expand...
Too bad ,I forgot to give other creams as example ... It would have helped
 
mary mar said:
Plz i do not want such comments ... I am trying to get an answer for my question if you can help .. Thanks
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This is the internet, people can and will make unrelated comments on threads. They will also give unasked for advice. My unasked for advice to you, if you are that upset by unrelated comments, then you should stay off the internet and go ask your high school/college chemistry teacher your questions.
 
BidingMyTime said:
This is the internet, people can and will make unrelated comments on threads. They will also give unasked for advice. My unasked for advice to you, if you are that upset by unrelated comments, then you should stay off the internet and go ask your high school/college chemistry teacher your questions.
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I am fine with those comments , i have seen a lot of them and i know how to deal with it ... But i was gonna show this discussion to the pharmacist and i did not wanna show her such words or arguements... Thanks for your advise
 
mary mar said:
I know it is a common sense but they were not convinced by it ... That is why i need some similar calculations
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If you pour a shot of tequila from the tequila bottle, do the properties of the tequila change in anyway? This is very simple...why do people need calculations and references to understand this?
You can conduct an experiment for your doubters:

1. Run down the hallway and buy a bottle of pepsi from the vending machine.
2. Grab a cup from someone.
3. Pour some pepsi from the bottle into the cup.
4. Ask them if there's a difference between the pepsi in the bottle vs the pepsi in the cup. If they still doubt you, ask them to taste it.
 
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Lnsean said:
If you pour a shot of tequila from the tequila bottle, do the properties of the tequila change in anyway? This is very simple...why do people need calculations and references to understand this?
You can conduct an experiment for your doubters:

1. Run down the hallway and buy a bottle of pepsi from the vending machine.
2. Grab a cup from someone.
3. Pour some pepsi from the bottle into the cup.
4. Ask them if there's a difference between the pepsi in the bottle vs the pepsi in the cup. If they still doubt you, ask them to taste it.
Click to expand...


haha it is a good idea , i like pepsi
 
Wheresmyaricept said:
Just to be that guy, pulling up a random thread on the Internet and saying "these anonymous people said I was right so that makes me right!" Isn't very credible.
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i posted this thread to help some patient not just to prove i was right, but you are right i am not gonna show this thread, i am gonna look for other source.. thanks
 
owlegrad said:
I suspect there was a language barrier here that lead to a misunderstanding. Most lay people understand the concept that a 10% cream will be 10% regardless of amount of cream used, let alone pharmacists.
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there was a language barrier i did the calculation and explained it, but i guess i can not do anything about it .. thanks
 
This whole situation is bizaare. So if I am following this, the OP is working with a pharmacist who thinks that if you have a 10% cream and you squeeze out part of, the cream is suddenly no longer 10%? So the OP, who is apparently a technician or ancilliary personnel is trying to convince the pharmacist that the cream would still be 10%?

Surely there is a supervisor somewhere? Either there is a severe misunderstanding due to language, or the pharmacist seems like they are having major issues effecting their practice.

OP, I suggest you go to the pharmacists supervisor and explain this situation.
 
First it was a pharmacist then a patient so which is it. There isn't/shouldn't be a single pharmacist who couldn't figure this out.
 
.....in my opinion if make 1000 gm of cream with concentration of 10% ... whether you dispense 1.5gm or 10gm the dose will have a concentration of 10% .. is this right ??...
Right. After making a cream with "concentration of 10 percent", any portion of the made cream will have "concentration of 10 percent". The "concentration of 10 percent" will be the same in any scoop or spoon you take out of made cream.

You are asking about making and I see a little confusing language here so please clarify further.
....if you wanna make a cream of 30gm in such if you dispense 1.5 gm of it it will contain 10% of medication ??

This sounds like "alligation calculation" in compounding pharmacy.
If this is a text book question, please precisely write the whole question.
If this is a life compounding issue of making cream, please explain further about the case.

"1.5 gm of it it will contain 10% of medication"
seems to be slightly different from
"concentration of 10%"

Please take...your...time... and give more details so we can help you here....
:highfive:
 
HelpfulPharmer1 said:
.....in my opinion if make 1000 gm of cream with concentration of 10% ... whether you dispense 1.5gm or 10gm the dose will have a concentration of 10% .. is this right ??...
Right. After making a cream with "concentration of 10 percent", any portion of the made cream will have "concentration of 10 percent". The "concentration of 10 percent" will be the same in any scoop or spoon you take out of made cream.

You are asking about making and I see a little confusing language here so please clarify further.
....if you wanna make a cream of 30gm in such if you dispense 1.5 gm of it it will contain 10% of medication ??

This sounds like "alligation calculation" in compounding pharmacy.
If this is a text book question, please precisely write the whole question.
If this is a life compounding issue of making cream, please explain further about the case.

"1.5 gm of it it will contain 10% of medication"
seems to be slightly different from
"concentration of 10%"

Please take...your...time... and give more details so we can help you here....
:highfive:
Click to expand...

I was a little confused by that too. OP can you clarify please?
 
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