Jump to content
JoLe

Using a digital scale to measure doses

Recommended Posts

Gridley

On the tray that comes with the Gemini scale, there's a little triangular funnel-like thing along part of the outer edge of the tray.  This is good for pouring the powder into the capsule.

Share this post


Link to post
Share on other sites
Hibari

Hi,  I need help with the weighing of tablets.  I originally used tablets, then switched to liquid but as I have come down, I don't know how much of the medication I am getting and I think it is

 

So I decided to switch to a scale and bought the Gemini 20-portable Milligram Scale.  

 

First of all the choice of measurements is confusing to me: gram, oz, ozt (troy oz) dwt (penny weight), ct (carat), gn (grain)

 

I think I should be using the ozt measurement because when I weigh my 25mg lamictal tablet, it comes up as 27. 

 

So, currently I am a16mgs of Lamictal.  I don't know how to do this with the scale. 

 

Do I just cut up my 25mg tablet and place the pieces into the tray till it weighs 16mg? 

 

Thanks. 

Share this post


Link to post
Share on other sites
ChessieCat
36 minutes ago, Hibari said:

First of all the choice of measurements is confusing to me: gram, oz, ozt (troy oz) dwt (penny weight), ct (carat), gn (grain)

 

I think I should be using the ozt measurement because when I weigh my 25mg lamictal tablet, it comes up as 27. 

 

So, currently I am a16mgs of Lamictal.  I don't know how to do this with the scale. 

 

Do I just cut up my 25mg tablet and place the pieces into the tray till it weighs 16mg? 

 

You will need to use gram because this is what mg (milligrams) is.

 

The tablet contains 25mg of the drug Lamictal (lamotrigine).  The tablet will weigh more because it has fillers in it.  To get a more accurate weight of a single tablet, weight a larger quantity of tablets and then divide the number of milligrams by the number of tablets.

 

Please do not use the figures below, they are an example only:

Once you have the weight of one tablet you will need to divide that by 25mg.  So as an example if the tablet weighs 30mg and the dose of the tablet is 25mg, divide 30 by 25.  Each 1.2mg of tablet weight will contain 1mg dose of drug.  Now multiply 1.2mg (tablet weight) x 15 (wanted dose) = 21.6mg tablet weight that you need to measure on the scale. 

 

Tapering Calculator - Download

Share this post


Link to post
Share on other sites
dukke

I'm using the Gem20 scale: http://www.betterbasics.com/guide/SW-GEM20-SIL

 

I'm currently at 46mg Seroquel, has anyone got experience of until when can one tapper successfully using this scale? Until what amount (mg)?

 

Where I live it's very difficult to get a liquid version of the medication prepared by a compound farmacy.

 

Thanks, best regards,

Share this post


Link to post
Share on other sites
ChessieCat
4 hours ago, dukke said:

Where I live it's very difficult to get a liquid version of the medication prepared by a compound farmacy.

 

From Page 1 of tips-for-tapering-off-seroquel-quetiapine

 

On 09/08/2014 at 5:55 AM, mammaP said:

You could ask your doctor to switch you over to immediate release tablets and make a liquid from them as above.  Many members make their own liquid from their tablets and get on fine with it. 

 

Share this post


Link to post
Share on other sites
dukke

Hi CheesieCar,

 

I'm aware some members are doing that, I was trying to avoid doing it until it's really necessary. It's a step further in venturing into sciences we are not fully qualified for.

 

That's why I'm asking until when have members been able to taper Seroquel effectively using a digital scale.

 

Thanks ChessieCar

 

Share this post


Link to post
Share on other sites
Gridley

 Brassmonkey tapered all the way down from 40 mg Paxil using the Gemini 20 scale. At the very end, I believe he had to "eyeball" it.  

Share this post


Link to post
Share on other sites
brassmonkey

I won't say that using a scale to taper is the method of choice around here, but quite a few members are doing it that way.  Gridley is correct, I used the Gemini-20 for my entire taper.  It does have some trouble at the very bottom of the range around 4mgpw so to get the last few drops I used the visual method of dividing a known amount into equal piles. Using the scales is the most accurate while being the least "scientific" method you can use.

Share this post


Link to post
Share on other sites
dukke

That's very good to know, thanks for that info. 

I'm going to continue tapering with the scale then, I'm not comfortable making my own liquid formula and I've read some members say Seroquel doesn't dissolve well in water. I also imagine the durability of that liquid might be a problem.

 

What do you mean by "4mgpw"? Is that 4mg of the whole pill weight, including the filler material and the active substance?

Share this post


Link to post
Share on other sites
brassmonkey

That's what I mean.  mgpw is the weight of the actual material from the pill.  The other designation is mgai (active ingredient) which is the strength designation on the bottle.  For me, I used 40mg paxil tablets.  So they were 40mgai, but they weighed 500mgpw each. With that information and a little algebra there is all sorts of useful information you can figure out.

Share this post


Link to post
Share on other sites
dukke

Any tips when weighing the pills? 

 

I always first check if the scale is weighing the calibration weight correctly and I weigh the pill powder till it gets to the right weight, turn off and on the scale and measure it again, in other words it has to give me two correct readings.

Share this post


Link to post
Share on other sites
RealMe

How do you taper using tablets?  I am stabilizing on 1/2 of 20 mg. fluoxetine tablets.  When I'm ready in a few months to taper by 10 %, how do I do it?  Do I crush and weigh the tablet?  Or could I cut or file 10% off the tablet, using the weight to figure it out?

Share this post


Link to post
Share on other sites
mona11

I'm doing my Lexapro with cutting. I never crush my tablet. Started at 15 mg, and I'm now taking 10.38 mg and having no problem. I'm doing this really really slowly. I mean, it took me 13 months to go down from 15 to 10.38, but I don't feel anything different after the cuts. Maybe some headache for 1 day or a little anxiety for 1 day, but I feel this is the pace I can take.

I'm doing better and better the lower I go, Thank God! I hope you do it really slowly and listen to your body. 

  

Share this post


Link to post
Share on other sites
Gridley

Just eyeball it.  For example, if you have a 20mg tablet and you want 10mg, then cut (I use small scissors) about half then add or subtract to get the weight you want.  No need to crush.  I too am tapering Lexapro, cutting 20mg tablets and weighing.  

 

These links may help:

 

How to cut up tablets or pills
Using a digital scale to measure doses
 

 

 

 

Share this post


Link to post
Share on other sites
mona11

I know that my 10 mg tablet of Lexapro weighs 13 mg. I do my cuts in mg of weight, not in mg of active ingredient. I don't know how to explain the process, but it's simple. :( 

I believe somebody will be able to explain  it better. Actually, I believe the links Gridley posted here explain the process. :)

 

Share this post


Link to post
Share on other sites
dukke

Hi RealMe,

 

It's the same thing. Either way works.

 

I usually cut with a knife to get an approximate amount and then adjust by adding smaller chunks or some powder to get to the desired amount.

Share this post


Link to post
Share on other sites
dukke

One possible procedure:

 

- Weigh 10 pills then find the average.

- Supposing you are weighing 20 mg fluoxetine tablets, you can now apply the cross-multiplication (https://en.wikipedia.org/wiki/Cross-multiplication):

 

<average pill weight> - 20mg (active substance)
<weight you need to achieve> - <desired active substance weight>

---

 

For example if you want 9 mg of active substance which is minus 10% of 10mg active substance, and if you found that the average pill weight (20mg fluoxetine tablet) was 60mg:

 

60mg/<weight you need to achieve> = 20mg/9

 

Isolating the variable to the left:

 

<weight you need to achieve> = (60 * 9) / 20

 

<weight you need to achieve> = 27mg

 

 

I hope I didn't further confuse you...

 

 

 

Edited by ChessieCat
corrected spelling of whey to weigh

Share this post


Link to post
Share on other sites
brassmonkey

Multiplying your current weight, either pill weight or active ingredient weight, by 0.9 will give you a dose weight that is reduced by 10%. Multiply by 0.95 for a 5% reduction or by 0.975 for a 2.5% reduction.

 

Mona-- is your Lexapro pill weight really 13mg?  That would be a very tiny pill.

Share this post


Link to post
Share on other sites
dukke

@brassmonkey could you reply to my question?

 

Any special tips when weighing pills? For example, do you add the calibration weight when weighing? I think I saw that the scale works better around quantities that are close to the calibration weight.. 

 

Thanks.

-------

@RealMe

For the cross multiplication link on Wikipedia check the Rule of three.

You can also just do what brassmonkey says..

Share this post


Link to post
Share on other sites
brassmonkey

 

Here's some of the things I've learned:

 

1. Work on a very solid surface, a heavy desk or counter top.

2. Have as little air movement as possible, no fans,A/C, and careful breathing

3. Put the calibration weight in the pan to bring the scale into the middle of it's range and press TARE.

4. Use a nail file to scoop small amounts of powder onto the pan and to scrape small amounts off to get the desired weight.

5. The readout will jump around a lot if the weight is between even mg levels, add or subtract powder to calm the readout.

6. Pour the powder into a folded Post-it note and then pour it from there into the capsule.

Share this post


Link to post
Share on other sites
mona11

I meant 13 g, sorry. It would be definitely a very very tinny pill if it was 13 mg :)

Share this post


Link to post
Share on other sites
brassmonkey

I think we're still a bit off Mona. 13 grams would be huge.  What is the exact reading on the scale? I found that little readout on the scales tricky to make out at times.

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now

×

Important Information

By using this site, you agree to our Terms of Use.