Lees de bijsluiter voor de dosering.

Lees is the imperative form of lezen, meaning read!

So the sentence is giving an instruction or command:

• lezen = to read
• Lees! = Read!

In Dutch, the imperative usually uses the verb stem, which is why the sentence starts with Lees.

This is because of Dutch spelling rules.

The infinitive is lezen. If you remove -en, the stem is pronounced with a long ee sound, so it is written lees to keep that long vowel.

Compare:

• lezen → lees
• geven → geef
• nemen → neem

So lees is not a different root; it is just the correctly spelled stem of lezen.

Because this is an imperative sentence. In Dutch, as in English, commands often leave out the subject.

So:

• Lees de bijsluiter. = Read the leaflet.

The subject is understood:

• informal: you
• general instruction: one / the reader
• formal version could be Leest u de bijsluiter.

So the lack of a visible subject is completely normal here.

Bijsluiter is the word for the information leaflet or package insert that comes with medicine.

It is a very common medical/pharmacy word in Dutch. If you buy tablets or other medication, the paper inside the box is the bijsluiter.

It is best learned as a fixed vocabulary item:

• de bijsluiter = the patient information leaflet / package insert

Not here.

Although voor can mean before in a time sense, in this sentence it means something more like:

• for
• regarding
• for information about

So voor de dosering means something like:

• for the dosage
• for information about the dosage

A native English speaker might first read it as before the dosage, but that is not the intended meaning here.

Because both nouns are common-gender nouns in Dutch, and common-gender singular nouns take de.

So:

• de bijsluiter
• de dosering

There is no special reason visible from the sentence itself; this is just something you learn with each noun. As a learner, it is helpful to memorize nouns together with their article.

Yes. This is the normal order for a simple imperative sentence:

• Lees = verb
• de bijsluiter = direct object
• voor de dosering = prepositional phrase

So the structure is:

Verb + object + extra information

That is a very common Dutch pattern in instructions and notices.

It is understandable, but it can feel a little compact. Dutch often makes this idea more explicit, for example:

• Lees de bijsluiter voor informatie over de dosering.
• Lees in de bijsluiter wat de dosering is.

So the original sentence is fine as an instruction, but a fuller version may sound a bit clearer, especially to learners.

Not exactly.

• dosis = dose, a single amount
• dosering = dosage, dosing, dosage instructions, or the amount/how often something should be taken

So dosering is usually broader than just one single dose. In a medical context, it often refers to the recommended amount and how it should be used.