zhè gè yào chī le yǐhòu, bú huì mǎshàng tuìshāo, kěshì wǎnshang yīnggāi huì shūfu yìdiǎnr.

Yes. 这个药 is the most straightforward, standard way to say this medicine:

• 这 = this
• 个 = a general classifier
• 药 = medicine

So 这个药 literally follows the common Mandarin pattern:

demonstrative + classifier + noun

You may also hear 这药, especially in casual speech, but 这个药 sounds more complete and is usually better for learners.

In Mandarin, classifiers are used not only with numbers, but also with words like 这 (this), 那 (that), and 哪 (which).

So:

• 这个药 = this medicine
• 那个药 = that medicine
• 哪个药 = which medicine

Even though 药 is not literally being counted, Mandarin still normally wants a classifier after 这. 个 is the general classifier and is very common here.

Here, 了 marks the action of taking/eating the medicine as completed before the next thing happens.

• 吃了以后 = after taking it / after you take it

Without 了, 吃以后 sounds incomplete or unnatural in this context.

So the structure is:

• 吃了 = took it / have taken it
• 以后 = after

Together, 吃了以后 means after taking the medicine.

Because 以后 usually comes after the event it refers to.

Pattern:

• V + 了 + 以后 = after doing something

Examples:

• 吃了以后 = after taking/eating it
• 看了以后 = after seeing it
• 下班以后 = after getting off work

So 吃了以后 is the normal order.

Yes, 吃 often means eat, but in Mandarin it is also commonly used for taking medicine, especially pills, tablets, or oral medicine.

So:

• 吃药 = take medicine

This is completely natural in Chinese. English uses take medicine, but Mandarin often uses eat medicine.

Here 不会 expresses a prediction: it will not.

So:

• 不会马上退烧 = it won’t reduce the fever right away

Although 会 can sometimes mean know how to or be able to, in this sentence it means something like will / be likely to.

This is not about ability. It is about what is expected to happen.

This is a pronunciation rule called tone sandhi.

Normally:

• 不 is fourth tone: bù

But when 不 comes before another fourth-tone syllable, it changes to second tone:

• 不会 → bú huì

Since 会 is fourth tone, 不 changes from bù to bú.

退烧 literally means the fever goes down or reduce a fever.

• 退 = go down, recede
• 烧 = fever

In this sentence, 不会马上退烧 means:

• the fever won’t go down immediately
• or it won’t bring the fever down right away

So 退烧 is a very common expression related to fever.

Because 马上 is an adverb, and adverbs usually come before the verb in Mandarin.

So:

• 马上退烧 = immediately reduce the fever / the fever go down immediately

This is normal Mandarin word order:

• 不会马上退烧
• should/will not immediately reduce the fever

Because 可是 introduces a contrast, like but / however in English.

The sentence has two parts:

1. 吃了以后，不会马上退烧
2. 可是晚上应该会舒服一点儿

So the comma helps separate the first idea from the contrasting second idea:

• it won’t work right away,
• but by evening, you should feel a bit better.

Both mean but. In many cases, they are interchangeable.

• 可是 often sounds a little more conversational or natural in speech
• 但是 can sound slightly more neutral or formal

In this sentence, 可是 sounds very natural.

Mandarin often leaves out subjects when they are clear from context.

In English, we usually need to say:

• you should feel a bit better by evening

In Chinese, once the situation is clear, the subject can be omitted:

• 晚上应该会舒服一点儿

The listener understands that it means you will feel a bit more comfortable, or more generally the person taking the medicine.

This kind of omission is very common in Mandarin.

Because time words in Mandarin often appear directly without a preposition.

So:

• 晚上 = in the evening / tonight

Mandarin commonly puts time expressions before the verb phrase:

• 晚上应该会舒服一点儿

You can sometimes use 在 with time phrases, but here it would be less natural. Just 晚上 is the normal choice.

This is a very common combination.

• 应该 = should / ought to / is expected to
• 会 = will / be likely to

Together, 应该会 means something like:

• should probably
• is expected to
• will likely

It sounds less absolute than just 会.

Compare:

• 晚上会舒服一点儿 = you will feel a bit better tonight
• 晚上应该会舒服一点儿 = you should probably feel a bit better tonight

So 应该会 makes the statement sound more cautious and medically appropriate.

一点儿 after an adjective means a little bit.

So:

• 舒服 = comfortable / feel better
• 舒服一点儿 = a little more comfortable / a bit better

In natural English here, it usually means:

• feel a bit better

This does not necessarily mean completely well. It just means some improvement.

Both 一点 and 一点儿 can mean a little. The 儿 here is an example of erhua, which is common in northern Mandarin and in standard spoken Mandarin.

So:

• 一点 and 一点儿 are very close in meaning
• 一点儿 often sounds more natural in speech

Learners should recognize both.

This is another tone change rule.

Normally 一 is first tone: yī. But its tone changes depending on what follows.

Before a fourth-tone syllable, 一 becomes fourth tone:

• 一 + 点 → yì diǎn

So 一点儿 is pronounced yìdiǎnr.

In Mandarin, 舒服 is usually treated like an adjectival verb or stative verb.

That means it can function like an adjective in English, but in Chinese it behaves more like a verb in some ways.

Here:

• 会舒服一点儿

means:

• will feel a bit better / more comfortable

So it describes a state, and Mandarin does not need a word like be before it.

Yes. That is very natural in Mandarin.

The first part talks about the effect of the medicine on the fever:

• 不会马上退烧

The second part talks about the person’s condition:

• 晚上应该会舒服一点儿

Even though the sentence shifts slightly in focus, Mandarin often leaves those subjects implicit because the meaning is clear from context.

A helpful breakdown is:

• 这个药 = this medicine
• 吃了以后 = after taking it
• 不会马上退烧 = won’t reduce the fever right away
• 可是 = but
• 晚上 = by evening / in the evening
• 应该会 = should probably / will likely
• 舒服一点儿 = feel a bit better

So the structure is roughly:

Topic + after doing X + result 1, but + time + expected result 2

This is a very common Mandarin way to explain what medicine will do over time.