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How many milligrams are there in one milliliter? Calculation of drug dosage

All of us in life are often faced with the need to measure the weight of both our own and purchased products. Of course, weight is often expressed in kilograms rather than in grams. And even less often in milligrams.

So imagine that, despite the simplicity of this question, not every person can remember how many milligrams are in a gram. But when you take a ready-made medicine or prepare a homemade version of a medicinal drug, this is vital for the purposes of proper preparation, adding and mixing of ingredients.

In order to understand how many milligrams are in a gram, you need to remember what a gram is. After all, the gram is the SI unit of measurement for determining body weight.

This is what a one-gram weight looks like

The very concept of a gram comes from France, remember the name “gramme”. As a unit of measurement, the gram was introduced in late XVIII century. In terms of its weight, it is equal to 0.001 kilograms, (or 0.000001 tons, 0.00001 centners), in other words, there are a thousand grams in one kilogram. A gram is denoted using the letter “g” in Cyrillic and the letter g in Latin.

In most countries in Europe and around the world, grams, like other SI units, are used to measure weight in science, technology and in everyday life. But in the USA and some other countries, weight is still measured in pounds; it is approximately equal to 0.45 kilograms.

There are special tables for converting weight values from pounds to kilograms and vice versa. Although confusion manifests itself in the pound's own numerical equivalents, so it is preferable to switch to kilograms.

Moreover, earlier, in Rus', similarly, there was a pound, it was somewhat heavier than the modern one.

In the system of measuring weight in pounds, there is a kind of analogue of a gram - this is an ounce (oz). It weighs 28.4 grams.

How many milligrams are in one gram

Units of measurement larger than a gram are kilograms, centners and tons. But the gram also has its own “multiple units”, smaller than it and included in it:

milligram (mg-mg),
microgram (mcg-mkg),
nanogram (ng-ng),
pictograms (pg-pg).

Of course, the above gram slices are practically not used in everyday life. This is a matter of science, which has ultra-sensitive scales in its arsenal.

This is what milligram weight standards look like

The simple answer to the question of how many milligrams are in 1 gram is the number 1000, that is, one gram consists of a thousand milligrams, or there are 0.001 grams in one milligram.

How many milligrams are in a gram, why do you need to know this?

A milligram is a tiny unit of weight, very rarely used for measurement in everyday life. We will not measure salt, sugar, and cereals in milligrams.

But knowing how many milligrams are in a gram will help you find out and calculate the required dose of a drug, especially for a child. When a child or teenager gets sick, the dosage of the medicine is usually small, less than a gram, and you need to have an idea of the ratio of grams to milligrams so as not to cause harm to the person’s health.

Let me give you an example: a child has been bitten by a bee or a wasp, the bite site turns red and swells, an antihistamine must be taken urgently. You find the medicine in tablets, and even in a dose for an adult. What to do?

You must carefully read the instructions for use of the drug. Let's say one tablet weighs 1 gram. Children weighing up to 10 kilograms can be given no more than 250 milligrams of this pharmaceutical product at a time. If you have knowledge about milligrams, you can easily calculate the permissible dose for a child: 1 g = 1000 mg, 1000/250 = 4. This means that children can be given only one quarter of the tablet at a time.

Another example, now there is a fashion for preparing homemade skin care products. Have you heard of making your own soap from scratch? Despite the apparent simplicity of the manufacturing process, you need to strictly follow the recipe and the dosages of components indicated in it, so as not to get a skin burn.

Because if the proportion of oils and caustic soda is incorrectly calculated, it may turn out that not all of the soda will interact with the oils and the remainder of it will get on the skin when using soap. On the other hand, there may be an excess of oils and the soap will not clean well.

Milligram and milliliter

Sometimes people confuse milligram and milliliter (ml). Remember:

Weight is measured in milligrams;
milliliters - volume.

The amount of liquid is measured in milliliters. For example, the syringe scale is milliliter, not milligram.

Powders and tablets are always measured in milligrams.

These two measures are equal when the density of the liquid being measured is equal to its weight. For example, water!

IN Everyday life, people automatically know how to convert kilograms to grams and vice versa when shopping in a store or preparing dishes in the kitchen. Similarly, you can develop the habit of converting grams to milligrams and vice versa. Knowing clearly how many milligrams are in a gram, you can accurately carry out calculations.

This video from the SliderPoint Presentations channel clearly presents the units of mass adopted in the International System of Units of Measurement.

Much of what you read below may seem strange and even offensive. After all, this “much” is studied in the first three grades of a regular high school.

But still, reminders and primitive explanations can be useful, taking into account the fact that you will be doing the calculations in a particularly nervous state due to the child’s illness...

So, we will talk about how to correctly calculate the dose of medication for a child.

The dose of your child's prescribed medication should be measured in some way, and can be used as units of measurement :

units of mass (gram, milligram, etc.);
units of volume (liter, milliliter, drop, etc.);
special units (conditional, biological, etc.);
units of a specific dosage form (tablet, capsule, ampoule, etc.).

The basic unit of measurement for mass is gram and its derivatives - milligram and microgram.

Common abbreviations:

gram - g;
milligram - mg;
microgram - mcg.

In 1 g - 1,000 mg or 1,000,000 mcg.
1 mg contains 1,000 mcg.

1.0 is a gram;
0.001 is a milligram;
0.000001 is a microgram.

The basic unit of volume is milliliter . The usual liter in everyday life is rarely used as a dose, but still sometimes used. For example, “the volume of liquid required for a cleansing enema is 1 liter” or “the daily volume of infusion therapy is 1.5 liters.”

Common abbreviations:

liter - l;
milliliter - ml.

In 1 l - 1,000 ml.

Unit of volume in mandatory indicated!

If it is not indicated, i.e. it is simply written 15.0, it means that this is not a volume, but a mass - 15 grams. If we're talking about about milliliters, then next to the number 15 it should be written - ml: 15.0 ml.

Please be careful: The most common parental mistake is when they get confused MG And ML.

Let us draw your attention once again, since this particular point is extremely relevant!

Do not confuse units of mass and units of volume - this is very, very important!

Whenever a drug is prescribed parenterally in a certain number of ml, we are talking about the fact that this volume will be measured with an injection syringe of the appropriate size or an infusion solution bottle with appropriate volume marks will be used.

Modern packaging, dosed in milliliters medicines For reception inside must contain special measuring devices: caps, pipettes, syringes, cups, measuring spoons.

If there is nothing of the kind, but the medicine is still prescribed inside and in ml, which means that to measure the required volume, you should use injection syringes or special graduated measuring cups sold in pharmacies.

A non-standard and imprecise unit of volume measurement is a drop . The volume of a drop is largely determined physical properties dosed liquid.

So, for example, the volume of one drop alcohol the solution is on average 0.02 ml, and the volume of one drop water solution can range from 0.03 to 0.05 ml.

Pharmacists and doctors have long agreed that The standard pharmaceutical, medical drop measure is 0.05 ml.

Thus, 1 ml = 20 drops.

When a solution of a particular drug is prescribed to your child in drops and we are talking about a modern medicine, the packaging usually contains a special pipette or the bottle cap is a special dropper.

If there is no pipette or dropper cap, then you can use a standard medical pipette sold in any pharmacy. If many drops are prescribed, it is quite possible to use a disposable syringe to measure the required volume of liquid.

Prescribed 10 drops - that means 0.5 ml; 40 drops - respectively, 2 ml.

You can even use the formula:

number of ml = number of drops divided by 20.

The main thing to remember is that whenever a certain medicine is prescribed in drops, and you cannot figure out how to extract and measure these drops, in such situations it is clearly understood that the volume of one drop is 0.05 ml. And this means that if you have a 1 ml medical syringe in your home, you can easily and absolutely accurately determine the required volume of medicine: 2 drops - 0.1 ml, 3 drops - 0.15 ml, 5 drops - 0.25 ml etc.

Even more non-standard (compared to drops) units of volume measurement are the various household spoons, which are sometimes (but less and less often) used for dosing low-active and relatively safe drugs.

Standard volume of spoons in ml:

tea room spoon - 5 ml;
dessert spoon - approximately 10 ml (there is no single standard);
dining room spoon - in the CIS countries - 18 ml, in the USA, Canada - 15 ml, in Australia - 20 ml;

In some countries, the concept of a baby spoon is used.

children's spoon - 10 ml.

To completely close the topic of kitchen utensils for measuring volume, let’s remember glass . Dosing with glasses is more common in cooking, but is sometimes used in medicine to measure the volume of infusions, decoctions, rinses, etc.

one glass - 200 ml.

The active substance is present in the liquid medicine in a certain concentration. Digital value this concentration is reflected in such a seemingly obvious, but not always understandable expression as percentage of solution .

The expression “5% ascorbic acid solution” does not look complicated or mysterious at all. But still, some clarifications should be given in order to finally dot the i’s.

So, concentration in pharmacology is usually displayed as number of units of mass per unit of volume. Thus, the expression “1% solution” means that 100 ml of liquid contains 1 g of active substance.

In the vast majority of cases, the volume of fluid prescribed to the child is measured in milliliters. Therefore, we recalculate:
100 ml - 1 g;
10 ml - 0.1 g;
1 ml - 0.01 g.
0.01 g is 10 mg. A completely logical conclusion: in 1 ml of 1% solution contains 10 mg of active ingredient .

We train:

in 1 ml of 5% ascorbic acid solution - 50 mg of ascorbic acid;
in 1 ml of 50% analgin solution - 500 mg of analgin;
in 1 ml of 0.1% solution of loratadine - 1 mg of loratadine;
in 1 ml of 66.7% lactulose solution - 667 mg of lactulose;
in 1 ml of 0.05% chlorhexidine solution - 0.5 mg of chlorhexidine...

Manufacturers of children's dosage forms are very skeptical about parents' mathematical abilities. The instructions may well say “loratadine solution 0.1%,” but the packaging will indicate in large letters: “loratadine 1 mg/1 ml” or “loratadine 5 mg/5 ml.”

A huge number of liquid medicines are available in different concentrations. 1 ml of paracetamol suspension can contain 20, or maybe 50 mg: on the box with the suspension they will write “120 mg/5 ml” or “250 mg/5 ml”. The pharmacy worker will not be able to dispense it correctly, and the mother will not be able to correctly give the child paracetamol prescribed in a dose of “5 ml suspension” - you need to know what concentration of the suspension we are talking about. Thus, Whenever your child is prescribed anything liquid, it is important to make sure that you know not only the name of the solution, but also its concentration!

A situation where a doctor prescribes a solution, syrup, suspension, etc., but does not indicate the concentration, is nevertheless possible.

For example, lactulose syrups are produced by almost all manufacturers in the form of a 66.7% solution. And when the doctor wrote: “ Lactulose syrup 5 ml in the morning before breakfast", then there is no mistake in this.

Another option: we are talking about a drug prescribed under a specific trade name.

An example of such an assignment: “ Nurofen for children, suspension, at temperatures above 39 °C 10 ml orally" The suspension called “Nurofen for children” is available in only one concentration - 100 mg/5 ml. Therefore, everything is written correctly, it is impossible to make a mistake.

Another question is that the pharmacy may tell you something like this: “We currently do not have Nurofen for children in suspension. We have another medicine, but it contains ibuprofen, as well as nurofen, and this is different - only in tablets of 0.4. Everything else is in regional center, bus tomorrow morning..."

And then you calculate:

10 ml with a concentration of 100 mg/5 ml - this means we were prescribed 200 mg.

And in a tablet 0.4 is 400 mg.

So, we will persuade Mashenka to swallow half a tablet...

Another fundamental important point. Knowing the concentration is necessary not only when drugs are taken orally and dosed in ml. For topical use and dosing with drops, this is no less important.

And if it is appointed " xylometazoline 2 eachdrops in each nostril 3once a day“, then before dripping, you should definitely clarify which xylometazoline we are talking about - 0.1% or 0.05%?

The concentration of the active substance in dermatological products is also indicated as a percentage, but there is no specificity here. Therefore, if it is written “ hydrocortisone ointment 1% ", this means that 1 ml of this ointment contains 10 mg of hydrocortisone. But just like with a paracetamol suspension, you cannot simply write “hydrocortisone ointment”, since this ointment comes in 0.5%, 1%, 2.5%...

Now about dosing using special units . Whenever we are talking about certain medicinal units, the number of these units is linked either to a unit of volume, or to a specific package or dosage form. And this relationship must be clarified!

That is, you must definitely know that in 1 ml of solution insulin contains exactly 40 units or exactly 100 units of the drug.

You definitely need to know what exactly is in this tablet with pancreatin contains a dose equal to 10,000 units of lipase. Exactly 10 thousand, not 40 or 25.

You must know that this particular sterile vial contains 500,000 units of sodium salt benzylpenicillin.

Once again I would like to emphasize that Whenever something is prescribed in units, it is imperative to clarify in what volume, in which bottle, in which capsule exactly this number of units is contained.

There are enormous difficulties and many errors associated with using the name of a specific dosage form as a dosage unit.

One tablet of the same pharmaceutical product may contain different quantities active substance. So, for example, in one tablet paracetamol may be 80, 120, 125, 200, 285, 325, 500 or 564 mg. Obviously, no one will be able to correctly sell in a pharmacy or give a child paracetamol prescribed in a dose of “1 tablet”.

Therefore, next to the name of the drug and the selected dosage form, the amount of the active substance in this particular dosage form prescribed for a specific patient should be indicated.

Examples:

calcium gluconate, tablets 0.5;
cephalexin, capsules 0.25.

An indication of a certain tablet or capsule, in the absence of information about the content of the active substance, may in some cases be justified by the fact that there is no choice of tablets for this particular medication No.

This is possible if:

the drug is produced in this dosage form only with a strictly defined amount of the active substance. For example, ornidazole Available in tablets of 0.5. There are no other tablets. You can't go wrong;
the drug is prescribed under a trade name, and a specific manufacturer produces it only in this dosage form - there is no choice. For example, one tablet suprastina always contains 0.025 chloropyramine. Therefore, if Suprastin is prescribed one tablet twice a day, you can’t go wrong;
the drug is a strictly defined combination of certain ingredients protected by a trade name. For example, decathylene, lozenges. There is no other decathylene. You can't go wrong.

We already know that the optimal way to dose medications for children is based on the relationship between the dose and the child's weight.

Let's look at the subtleties of such dosing using the example of the most popular children's antipyretic drug - paracetamol.

From paragraph 2.1. we know that single dose paracetamol is 10-15 mg/kg.

We have a child weighing 15 kg. Thus, a single dose of the drug ranges from 150 (10 x 15) to 225 (15 x 15) mg.

We bought a 120 mg/5 ml suspension. This means in one ml - 24 mg. And we need from 150 to 225. This means that our single dose is approximately 6.2-9.3 ml.

We bought a 250 mg/5 ml suspension. This means 50 mg in one ml. And we need from 150 to 225. This means that our single dose is 3-4.5 ml.

We bought 200 mg tablets. And we need from 150 to 225. This means our single dose is 1 tablet.

We bought 325 mg tablets. And we need from 150 to 225. This means that our single dose is half a tablet.

Now let's deal with daily dose the same paracetamol. If indicated, this medicine can be given repeatedly during the day, but no more than 4-5 times, and it is very important that the interval between doses is at least 4 hours.

Still the same child - body weight 15 kg. The maximum daily dose of the drug should in no case exceed 60 mg/kg. This means that our baby can take no more than 15 x 60 - 900 mg per day.

We bought a 120 mg/5 ml suspension. This means in one ml - 24 mg. And we need no more than 900. This means that our maximum daily dose is 37.5 ml (900/24).

We bought a 250 mg/5 ml suspension. This means 50 mg in one ml. And we need a maximum of 900 per day. This means that our daily dose should not exceed 18 ml (900/50).

We bought 200 mg tablets. This means you can’t take more than four tablets per day.

We bought 325 mg tablets. This means our maximum daily dose is 2 tablets and another three-quarters of a tablet.

This list of ours already shows that, knowing the weight and the required single/daily dose, it is quite easy to make a rational choice of dosage form. Obviously, giving a child 3 ml of suspension in most cases is much easier than 10 ml or half a tablet. Therefore, for a child weighing 15 kg, the optimal dosage form of paracetamol would probably be a suspension of 250/5 ml.

Even more indicative in this aspect is the choice of the optimal dose of paracetamol for rectal administration.

It is known that when using suppositories, a single dose of paracetamol is higher than when taken orally, and is 20-25 mg/kg. Thus, a child weighing 10 kg should receive a suppository containing 200 to 250 mg. We go to the pharmacy, and it turns out that suppositories with paracetamol are available for sale, containing the active substance in quantities of 50, 80, 100, 125, 150, 250, 300, 500, 600 and even 1,000 mg. In our situation, it is most logical to buy 250 mg suppositories and use them with minimal stress on the child’s psyche. But you can not know all this and mock your child by putting two 100 mg suppositories into him, or mock yourself by trying to cut off half of a 500 mg suppository.

We also draw your attention to the fact that careful study of the sheet with medical prescriptions in many cases will allow you to save significant money.

Example of assignments: " azithromycin suspension. 200 mg 1 once a day half an hour before meals, 3 days in a row" We go to the pharmacy, and there it turns out that the antibiotic azithromycin in suspension is sold in the following packages:

powder for suspension 100 mg/5 ml, bottle 20 ml;
powder for suspension 200 mg/5 ml, bottle 15 ml;
powder for suspension 200 mg/5 ml, bottle 30 ml;
powder for suspension 200 mg/5 ml, bottle 20 ml.

It is clear that the optimal choice in our situation is 200 mg/5 ml, a 15 ml bottle - this is just enough for the prescribed course of treatment. Any other packaging is not economically profitable: you will either have to buy more or you will have to leave it.

Unfortunately, a situation often occurs when a doctor simply does not have time to keep up with the rapidly changing assortment of pharmacies. And in this case, the following assignments are quite possible: “ loratadine 5 mg 1once a day for 2weeks" This, of course, is wrong, but a very minor parental intellectual effort can solve the problem.

So, we come to the pharmacy. - I need loratadine, 5 mg.

It turns out that loratadine comes in 10 mg tablets, as well as in syrups or suspensions - 1 mg/1 ml.

5 mg is half a tablet or 5 ml of syrup. We don’t want to share pills, and our little one has problems swallowing pills, so we buy a tasty liquid and give what the doctor prescribed...

By the way, before purchasing, we carry out simple calculations: 5 ml per day, and for 2 weeks, that’s 5 x 14 - it turns out that you need 70 ml for a course of treatment. How much is there in the bottle? We are interested: it turns out that one bottle of loratadine syrup or suspension can contain 30, 50, 60, 100, 120 and 150 ml. Probably the most rational way is to buy a 100 ml bottle - please give me...

And the last thing I would like to draw your attention to. Whenever a doctor prescribes dividing tablets, this is either indicated by the words (half, third, quarter) or by a fraction: 1/2, 1/3, 1/4.

And if it says “calcium gluconate 0.5” - this is not half a tablet (!), this is half a gram - 0.5 g.

0.25 is not a quarter of a tablet, it is 0.25 g.

Here and further, when we pronounce the expression “basic unit,” we mean the unit main from the standpoint of drug dosing. That is, we know that from the point of view international system units (System Internationale, SI), the basic unit of mass is the kilogram (kg), and the standard unit of volume is the cubic meter (m3).

After finishing school, many of us forget a lot of the material we have covered. And a simple question - “How many milligrams are in a gram” - often confuses people; the answer is not clear. However, this useful knowledge is very necessary in our daily life! And I will prove this using elementary everyday examples.

Look, the correct dosage of various constituent ingredients or components in cooking, cosmetology, and medicine completely depends on how diligently we have learned the systems for converting body weight from kilograms to grams, and from grams to milligrams.

A frivolous and unscrupulous attitude towards any production process will ruin the final result - obtaining a product of high quality in all respects, be it an anti-aging cream, a homemade dish or a medicine.

You need to initially figure out what, where and in what quantity you can add. Therefore, knowing how many milligrams are in a gram will be very useful to us in life.

How many milligrams are in one gram?

When working with substances of small volume, small component sizes are most often used. It is very important not to confuse the ratio of the constituent substances.

You know, even on the vastness of the World Wide Web of Information - the Internet, you can sometimes find “brilliant” knowledge of the physical properties of a substance, where “experts” claim that supposedly one gram contains 100 milligrams!

But imagine, when people read such posts, some of them are misled and make mistakes in their calculations, God forbid, if he is a pharmacist!

So, how many milligrams are in a gram, how to do the calculations correctly?

Remember that one milligram is one thousandth of a gram. The prefix "Milli" means 10 to the - 3 (minus third) power. It indicates one thousandth.

One gram consists of one thousand milligrams. Everything is very simple and without a calculator. It is quite enough to use the most basic knowledge from the field of arithmetic and physics.

Calculations, formula, examples, how to calculate

To make it easier to understand how many milligrams are in 1 gram, see this visual example:

1 gram equals 1,000 milligrams

Or vice versa:

1 milligram will equal 0.001 grams

Therefore:

1 kilogram is equal to 1000 grams, this is equal to 1,000,000 milligrams

Using this simple table you can correctly calculate the amount of substances.

If you're going to do it right cosmetical tools, medications, strictly follow the recipes for their preparation, knowing how many milligrams are in one gram is very necessary!

You can independently understand all the nuances and subtleties of the culinary or pharmaceutical arts, but not knowing a simple thing, how many milligrams are in a gram, will put your professional and amateur suitability in these areas of activity in very big question. You must correctly calculate the weight of components and ingredients and quickly find rational solutions.

Let's assume that you really need to be given an effective medicine small child. The dosage of all drugs is strictly different for adults and children. The most difficult task is to choose the right dose of medication to avoid side effects for the health of children under three years old, very young. Knowing the standard weight of a whole tablet, the quantity active substances in it, you can simply calculate the remedy for the baby.

For example, the weight of a whole tablet is 500 milligrams (half of one gram). The pediatric dose of the drug is 0.25 grams. To calculate, we will use an elementary school formula; there are two ways to convert quantities - from grams to milligrams or vice versa. Here's the result:

500 milligrams = 0.5 grams. And you only need 0.25. Therefore, we divide the tablet into two equal parts and get the required dose of the medicine.

You can do the opposite:

0.25 grams = 250 milligrams!

As a result, two figures are obtained in the calculation - 500 milligrams and 250 milligrams. Now it is easier to understand how to split the tablet correctly.

I will give a few more examples of converting grams to milligrams and vice versa.

0.12 grams = 120 milligrams.
540 milligrams = 0.54 grams.
0.03 grams = 30 milligrams.
36 milligrams = 0.036 grams.

This way, you can simply deal with incomprehensible quantities. There is no need to divide or multiply if you correctly understand the number of zeros.

In the previous version (2) with 540 milligrams, 0.54 grams can be obtained by moving the separating comma three digits forward, which means three zeros in 1000. Do you remember, have you forgotten that there are 1000 milligrams in one gram? And in example (3), with the conversion of 0.03 grams to milligrams, the comma is moved back three digits and the missing zero is added. Here's an example: 0.030 = 30.

Units of mass: general information

Video channel "SliderPoint Presentations".

Milligram is a unit of mass, one of the seven basic units of the International System of Units (SI). Abbreviations: Russian ml, international ml.
Gram, a basic unit of mass in the GHS system of units and a submultiple unit of mass (0.001 kg) in the International System of Units. Abbreviated designation: Russian g, international g.
Kilogram is a unit of mass, one of the seven basic units of the International System of Units (SI). Abbreviations: Russian kg, international kg.
Centner– unit of mass. Abbreviations: Russian ts.
Ton– names of various units of mass. A metric ton is equal to 1000 kg. Designations: Russian m, international t.
Lb is a unit of mass, one of the seven basic units of the International System of Units (SI). Abbreviations: Russian f, international f.
Grand- an outdated unit of mass, used in Russian pharmacy practice before the introduction of metric measures.

Thank you for your attention! Good luck to you, best wishes!

The basic unit of measurement for mass is gram and its derivatives - milligram and microgram.

Common abbreviations:

gram - g;
milligram - mg;
microgram - mcg.

In 1 g - 1,000 mg or 1,000,000 mcg.
1 mg contains 1,000 mcg.

1.0 is a gram;
0.001 is a milligram;
0.000001 is a microgram.

Common abbreviations:

liter - l;
milliliter - ml.

In 1 l - 1,000 ml.

The unit of volume must be indicated!

If it is not indicated, i.e. it is simply written 15.0, it means that this is not a volume, but a mass - 15 grams. If we are talking about milliliters, then next to the number 15 it should be written - ml: 15.0 ml.

Please be careful: The most common parental mistake is when they get confused MG And ML.

Let us draw your attention once again, since this particular point is extremely relevant!

Do not confuse units of mass and units of volume - this is very, very important!

Packaging of modern medicines dosed in milliliters For reception inside must contain special measuring devices: caps, pipettes, syringes, cups, measuring spoons.

A non-standard and imprecise unit of volume measurement is a drop . The volume of a drop is largely determined by the physical properties of the dosed liquid.

So, for example, the volume of one drop alcohol the solution is on average 0.02 ml, and the volume of one drop water solution can range from 0.03 to 0.05 ml.

Pharmacists and doctors have long agreed that The standard pharmaceutical, medical drop measure is 0.05 ml.

Thus, 1 ml = 20 drops.

Prescribed 10 drops - that means 0.5 ml; 40 drops - respectively, 2 ml.

You can even use the formula:

number of ml = number of drops divided by 20.

Standard volume of spoons in ml:

tea room spoon - 5 ml;
dessert spoon - approximately 10 ml (there is no single standard);
dining room spoon - in the CIS countries - 18 ml, in the USA, Canada - 15 ml, in Australia - 20 ml;

In some countries, the concept of a baby spoon is used.

children's spoon - 10 ml.

one glass - 200 ml.

The active substance is present in the liquid medicine in a certain concentration. The digital value of this concentration is reflected in such a seemingly obvious, but not always understandable expression as percentage of solution .

The expression “5% ascorbic acid solution” does not look complicated or mysterious at all. But still, some clarifications should be given in order to finally dot the i’s.

We train:

in 1 ml of 5% ascorbic acid solution - 50 mg of ascorbic acid;
in 1 ml of 50% analgin solution - 500 mg of analgin;
in 1 ml of 0.1% solution of loratadine - 1 mg of loratadine;
in 1 ml of 66.7% lactulose solution - 667 mg of lactulose;
in 1 ml of 0.05% chlorhexidine solution - 0.5 mg of chlorhexidine...

A situation where a doctor prescribes a solution, syrup, suspension, etc., but does not indicate the concentration, is nevertheless possible.

Another option: we are talking about a drug prescribed under a specific trade name.

And then you calculate:

10 ml with a concentration of 100 mg/5 ml - this means we were prescribed 200 mg.

And in a tablet 0.4 is 400 mg.

So, we will persuade Mashenka to swallow half a tablet...

Another fundamentally important point. Knowing the concentration is necessary not only when drugs are taken orally and dosed in ml. For topical use and dosing with drops, this is no less important.

And if it is appointed " xylometazoline 2 eachdrops in each nostril 3once a day“, then before dripping, you should definitely clarify which xylometazoline we are talking about - 0.1% or 0.05%?

That is, you must definitely know that in 1 ml of solution insulin contains exactly 40 units or exactly 100 units of the drug.

You definitely need to know what exactly is in this tablet with pancreatin contains a dose equal to 10,000 units of lipase. Exactly 10 thousand, not 40 or 25.

You must know that this particular sterile vial contains 500,000 units of sodium salt benzylpenicillin.

There are enormous difficulties and many errors associated with using the name of a specific dosage form as a dosage unit.

One tablet of the same pharmaceutical product may contain different amounts of the active substance. So, for example, in one tablet paracetamol may be 80, 120, 125, 200, 285, 325, 500 or 564 mg. Obviously, no one will be able to correctly sell in a pharmacy or give a child paracetamol prescribed in a dose of “1 tablet”.

Therefore, next to the name of the drug and the selected dosage form, the amount of the active substance in this particular dosage form prescribed for a specific patient should be indicated.

Examples:

calcium gluconate, tablets 0.5;
cephalexin, capsules 0.25.

This is possible if:

the drug is produced in this dosage form only with a strictly defined amount of the active substance. For example, ornidazole Available in tablets of 0.5. There are no other tablets. You can't go wrong;
the drug is prescribed under a trade name, and a specific manufacturer produces it only in this dosage form - there is no choice. For example, one tablet suprastina always contains 0.025 chloropyramine. Therefore, if Suprastin is prescribed one tablet twice a day, you can’t go wrong;
the drug is a strictly defined combination of certain ingredients protected by a trade name. For example, decathylene, lozenges. There is no other decathylene. You can't go wrong.