Controleer de dosering in de bijsluiter.

Yes. Controleer is the imperative form of the verb controleren (to check).

In Dutch, the imperative is often the same as the ik form without the pronoun:

• ik controleer = I check
• Controleer! = Check!

So Controleer de dosering in de bijsluiter means something like Check the dosage in the package leaflet.

This kind of form is very common in instructions, warnings, recipes, manuals, and medical advice.

That is normal in an imperative sentence. In Dutch, commands often leave out the subject, just like in English:

• Open the door.
• Controleer de dosering.

The subject is understood.

If you want, Dutch can add the subject for clarity or politeness:

• Controleer de dosering. = Check the dosage.
• Controleert u de dosering. = Please check the dosage. / Check the dosage, sir/madam.

So the version without a subject is the standard direct instruction form.

Dosering means dosage or dosing amount/instructions, especially in a medical context.

It takes the article de, so:

• de dosering = the dosage

This is something learners usually just have to memorize, because grammatical gender in Dutch is not always predictable.

Useful related words:

• de dosis = the dose
• de dosering = the dosage / dosing
• doseren = to dose

So de dosering is not a verb here; it is a noun.

De bijsluiter is the package leaflet, especially the information sheet that comes with medicine.

It is a very common medical/pharmacy word in Dutch.

Examples:

• Lees de bijsluiter. = Read the package leaflet.
• De bijsluiter bevat informatie over bijwerkingen. = The leaflet contains information about side effects.

A native English speaker might not know this word because it is quite specific, but in Dutch it is very standard in medical contexts.

Dutch uses in here because the dosage information is understood as being in the leaflet, meaning inside the text/document.

So:

• in de bijsluiter = in the leaflet

This is similar to English:

• Check it in the manual
• Read it in the instructions

Using op would usually suggest something physically on top of a surface or on a page in a different way, and van would mean of/from, which does not fit here.

The sentence has a very simple structure:

• Controleer = verb
• de dosering = direct object
• in de bijsluiter = prepositional phrase

So the pattern is:

Imperative verb + object + prepositional phrase

This is very common in Dutch commands:

• Lees het boek op tafel.
• Neem de tablet na het eten.
• Controleer de dosering in de bijsluiter.

Because it is an imperative, the verb comes first.

Yes. In a more formal or polite context, especially in written instructions directed at the reader, you may also see:

• Controleert u de dosering in de bijsluiter.

That sounds more formal or polite than the plain imperative.

However, the shorter version:

• Controleer de dosering in de bijsluiter.

is extremely normal for general instructions. On labels, notices, and manuals, Dutch often prefers the shorter command style.

Yes, and it can definitely be confusing.

Dutch controleren usually means to check, to inspect, or to verify.

It does not usually mean to control in the English sense of to direct/manage something.

So here:

• Controleer de dosering = Check the dosage

If you translated it as Control the dosage, that would usually sound wrong in English.

This is a classic false-friend issue for English speakers.

Yes. Dosering can refer not only to a single amount, but more broadly to the dosing instructions or recommended dosage.

For example, it may include:

• how much to take
• how often to take it
• for whom the dosage applies
• whether the dosage differs for children or adults

So in a real medicine context, Controleer de dosering in de bijsluiter may imply Check the dosing instructions in the leaflet, not just check one number.

Both are natural, but they focus on different things.

• Lees de bijsluiter. = Read the package leaflet.
• Controleer de dosering in de bijsluiter. = Check the dosage in the package leaflet.

The first is broader: read the leaflet in general.

The second is more specific: look up and verify the dosage information.

So this sentence is natural if the speaker wants to emphasize dosage specifically.

A helpful rough pronunciation is:

con-TRO-lair duh doh-SAY-ring in duh BAI-slau-ter

A few notes:

• Controleer has stress on the last part: -leer
• dosering has stress on se
• bijsluiter begins with bij, which sounds roughly like bai
• Dutch r can sound different depending on region

A more Dutch-like approximation in syllables:

con-tro-LEER de do-SEE-ring in de BAI-slui-ter

This is only an approximation for English speakers, but it helps with the stress pattern.