La paciento demandis pri kontraŭdolorilo.

La is the definite article, meaning the.

So la paciento means the patient, referring to a specific patient already known from the context.

If you said just paciento, it would sound more like a patient or patient in a more general sense, depending on context.

In this sentence:

• La paciento demandis pri kontraŭdolorilo. = The patient asked about a painkiller.

If you wanted a patient asked about a painkiller, you could simply say:

• Paciento demandis pri kontraŭdolorilo.

Esperanto has no separate word for a/an.

Demandis is the past-tense form of demandi, which means to ask.

So:

• demandi = to ask
• demandas = asks / is asking
• demandis = asked
• demandos = will ask

A very important point for English speakers:

In Esperanto, demandi usually means to ask a question or ask about something.

It does not usually mean to request in the sense of asking for an object or favor. For that, Esperanto often uses peti.

So:

• demandi pri kontraŭdolorilo = to ask about a painkiller
• peti kontraŭdolorilon = to ask for a painkiller

That is a very common distinction learners need to notice.

Pri means about, concerning, or regarding.

So:

• demandi pri kontraŭdolorilo = to ask about a painkiller

The patient is not necessarily requesting the medicine yet; they are asking about it.

Examples:

• Mi demandis pri la kuracado. = I asked about the treatment.
• Ŝi demandis pri la horaro. = She asked about the schedule.

This is one of the most natural ways to express ask about in Esperanto.

Not exactly.

La paciento demandis pri kontraŭdolorilo most naturally means:

• The patient asked about a painkiller
• The patient inquired about a painkiller

If you want asked for a painkiller, Esperanto would more naturally say:

• La paciento petis kontraŭdolorilon.

Why?

• demandi pri ... = ask about ...
• peti ... = ask for / request ...

This is a very useful difference to learn early, because English uses ask for both ideas, but Esperanto often separates them more clearly.

It has no -n because it is the object of the preposition pri.

After a preposition like pri, nouns normally do not take the accusative -n.

So:

• pri kontraŭdolorilo = about a painkiller

Compare:

• La paciento petis kontraŭdolorilon.
  Here kontraŭdolorilon does take -n, because it is the direct object of petis.

So the difference is:

• pri kontraŭdolorilo = prepositional phrase, no -n
• kontraŭdolorilon = direct object, yes -n

This is a good example of Esperanto word-building.

kontraŭdolorilo can be broken down like this:

• kontraŭ = against
• dolor = pain
• -il- = tool/instrument
• -o = noun ending

So literally it is something like:

• an instrument against pain

In natural English, that is simply:

• painkiller
• pain-relief medicine

Esperanto often forms words by combining meaningful parts, and this is very normal.

Yes, in Esperanto it is very normal to combine elements into a single word.

So kontraŭdolorilo is a perfectly natural compound.

Esperanto often prefers compact compounds where English might use multiple words. For example:

• skribtablo = writing-table = desk
• vaporŝipo = steam-ship
• malsanulejo = place for sick people = hospital

So kontraŭdolorilo as one word is not strange at all. It is one of the language’s most characteristic features.

In Esperanto, -is marks the past tense.

So:

• demandas = asks / is asking
• demandis = asked
• demandos = will ask

One nice feature of Esperanto is that verbs do not change depending on the subject.

So:

• mi demandis = I asked
• vi demandis = you asked
• li demandis = he asked
• la paciento demandis = the patient asked

The verb form stays the same for everyone.

Because ordinary Esperanto nouns are generally not inherently gendered.

So paciento simply means:

• patient

It does not itself mean male or female.

If you need to specify female, you can say:

• pacientino = female patient

If gender does not matter, or is unknown, paciento is the normal word.

This is different from English only in the sense that Esperanto makes the neutral form very regular.

Without la, kontraŭdolorilo is indefinite.

So:

• pri kontraŭdolorilo = about a painkiller / about painkiller medicine

If you said:

• pri la kontraŭdolorilo

that would mean:

• about the painkiller

That suggests a specific painkiller already known in the conversation.

So the original sentence sounds more general or indefinite.

Yes, Esperanto word order is fairly flexible, although the most neutral order is often similar to English.

The original:

• La paciento demandis pri kontraŭdolorilo.

You could also say:

• Pri kontraŭdolorilo demandis la paciento.

That might put more emphasis on kontraŭdolorilo or sound more literary or marked.

For ordinary speech and writing, the original order is the most straightforward and natural.

The most important thing here is ŭ.

In Esperanto, ŭ is a semivowel, similar to the w-like sound in some diphthongs.

So aŭ sounds roughly like the ow in cow.

That means:

• kontraŭ is pronounced roughly like KON-trow

So kontraŭdolorilo is approximately:

• kon-TRAUW-do-lo-REE-lo

A rough syllable breakdown:

• kon-traŭ-do-lo-ri-lo

Also remember that Esperanto stress usually falls on the second-to-last syllable:

• kon-traŭ-do-lo-RI-lo

Kontraŭdolorilo is clearer and more standard for painkiller.

If you said dolorilo, it would literally look like a tool/instrument related to pain, which is not what you want. It might sound odd or ambiguous.

Because the intended idea is something against pain, kontraŭdolorilo expresses that correctly.

So for a medicine used to relieve pain, kontraŭdolorilo is the better choice.