Reading a Thai Medicine Label: ครั้งละ, เม็ด, ก่อนอาหาร
TL;DR: A Thai dosage line is a chain of fractions held together by one particle. ละ divides by whatever word sits in front of it, so ครั้งละ 1 เม็ด is one tablet per dose and วันละ 3 ครั้ง is three doses per day, and the two multiply. The last word on the line is the timing, and the pair worth being certain about is ก่อนอาหาร against หลังอาหาร. This page is about the words. What to take is the pharmacist's job, not a reading exercise.
A Thai medicine label is a form, not a sentence
The dispensing bag from a Thai pharmacy and the printed sticker from a hospital pharmacy are the same document in two formats. Both carry a fixed set of fields in a fixed order, and only one of those fields is a sentence you have to parse. Everything else is a label with a value after it, which means most of the page can be located rather than read.
| Field | Read as | What sits in it |
|---|---|---|
| ชื่อผู้ป่วย | chue phuu-puai | The patient name, usually handwritten |
| ชื่อยา | chue yaa | The drug name, often in Latin letters |
| สรรพคุณ | sap-pha-khun | What it is for |
| วิธีใช้ | wi-thii chai | The dosage line. The one you must read |
| คำเตือน | kham-tuean | Warnings |
| ข้อควรระวัง | khor khuan ra-wang | Precautions, a softer register than คำเตือน |
| หมดอายุ | mot aa-yu | Expiry, and the year may be Buddhist Era |
ผู้ป่วย is worth pulling apart, because ผู้ turns up all over Thailand. It marks the person who does or undergoes the thing named after it: ผู้ป่วย is the one who is ill, ผู้โดยสาร is the one who is carried, ผู้จัดการ is the one who arranges. One syllable, and a whole family of nouns opens.
ระวัง in ข้อควรระวัง is the same word that stands alone on a Thai hazard sign, and it is doing the same job here: be careful, rather than do not.
ละ divides, and it always divides by the word in front of it
The dosage line is short and it is arithmetic. The particle ละ splits the line into rates, and the rule is positional: the unit being divided by comes first, then ละ, then the amount.
| Written | Divided by | Amount | Reads as |
|---|---|---|---|
| ครั้งละ 1 เม็ด | ครั้ง, one dose | 1 เม็ด | One tablet per dose |
| วันละ 3 ครั้ง | วัน, one day | 3 ครั้ง | Three doses per day |
| ข้างละ 1 หยด | ข้าง, one side | 1 หยด | One drop per eye or ear |
| กิโลละ 60 | กิโล, one kilo | 60 | Sixty baht a kilo, at a market stall |
The last row is not medicine and that is the point: the particle a learner first meets on a Thai price tag is the same one carrying the whole dosage line. Nothing new has to be learned to read it, only recognised in a new place.
So รับประทานครั้งละ 1 เม็ด วันละ 3 ครั้ง หลังอาหาร is one tablet a dose, three doses a day, after food. Three tablets across the day. The two rates multiply, which is why reading only the first of them is the mistake that matters.
รับประทาน is the formal verb for taking something by mouth, and it is on almost every printed label. Its everyday cousin ทาน is what a pharmacist says out loud, and กิน is what a friend says. A label that opens with ทา instead, one letter shorter, is not about swallowing anything at all: ทา is to smear, and the line will be about a cream.
The unit word tells you what shape the medicine is
Thai counts with classifiers, so the word after the number names the form the medicine takes. Six of them cover almost everything a visitor is handed.
| Word | Read as | Form |
|---|---|---|
| เม็ด | met, high | Tablet. The same word is used for a seed or a pip |
| แคปซูล | khaep-suun | Capsule, borrowed straight from English |
| ช้อนชา | chorn-chaa | Teaspoon, for a syrup |
| ช้อนโต๊ะ | chorn-to | Tablespoon, three times the teaspoon |
| หยด | yot, low | Drop, for eyes, ears or nose |
| ซอง | sorng, mid | Sachet of powder |
ช้อนโต๊ะ has a small joke in it. โต๊ะ is a table, borrowed from Chinese, and it carries ไม้ตรี, one of the two rare tone marks. A spoon for the table is a tablespoon, and Thai got there by the same route English did.
ก่อนอาหาร against หลังอาหาร, and why they are hard to confuse
This is the pair that changes what you do, and the good news is that the two words share no shape at all. ก่อน opens with ก and carries ไม้เอก above it. หลัง opens with ห and carries no mark. There is no stroke separating them and no risk of reading one as the other, which is not true of the letter pairs that really do collide.
| Timing | Read as | Means |
|---|---|---|
| ก่อนอาหาร | korn aa-haan | Before food |
| หลังอาหาร | lang aa-haan | After food |
| พร้อมอาหาร | phrorm aa-haan | With food |
| ก่อนนอน | korn norn | Before sleep |
| ทุก 6 ชั่วโมง | thuk hok chua-moong | Every six hours |
| เวลามีอาการ | wee-laa mii aa-kaan | When symptoms occur |
อาหาร is food and it is the anchor: find it, and the word immediately before it is the instruction. เช้า, กลางวัน, เย็น and ก่อนนอน then split the day into the four slots a Thai label uses, and they turn up on the bag as a printed row with a tick beside whichever ones apply.
The warning line, and the word that is not a warning
Warnings on a dispensing bag are a short and fairly closed set. ยานี้อาจทำให้ง่วงนอน says the medicine may make you sleepy. ห้ามขับรถ says do not drive, using the same ห้าม that forbids parking and smoking everywhere else in Thailand. ใช้ภายนอก means external use, and it is usually followed by ห้ามรับประทาน, do not swallow. เก็บให้พ้นมือเด็ก keeps it away from children, and เขย่าขวดก่อนใช้ asks you to shake the bottle first.
Then there is อันตราย, and here a reader who has learned it from signage will get it wrong.
On a wall, อันตราย is a flat statement that something can hurt you. On a medicine box, ยาอันตราย is a licensing class under Thai drug law. It means the product may only be handed over by a pharmacist, not that the tablets are hazardous. Three of these classes are printed on Thai packaging and they read as severity while they are actually a description of who is allowed to sell you the thing.
| Printed on the box | Reads as | Actually means |
|---|---|---|
| ยาสามัญประจำบ้าน | Household medicine | Sold anywhere, including a grocery |
| ยาอันตราย | Dangerous medicine | Pharmacist only. A licensing class, not a hazard |
| ยาควบคุมพิเศษ | Specially controlled medicine | Prescription only |
| ยาแผนโบราณ | Traditional medicine | Registered under the traditional formulary |
The same trap runs the other way with แก้. ยาแก้ปวด is medicine that fixes pain, ยาแก้ไอ fixes a cough, ยาแก้แพ้ fixes an allergic reaction. แก้ tells you the symptom being aimed at and nothing whatever about the drug class, which is why ยาแก้อักเสบ is a phrase to take to the counter rather than to act on. Reading the word correctly and knowing what is in the packet are two different things, and only the first one is on this page.
Four words, straight out of the rules
None of the load-bearing words here needs to be memorised as a picture. Each falls out of consonant class, syllable type and the mark on top, and working through them is a fair test of whether that machinery is in place.
- ครั้ง. A คร cluster, so the class of ค governs: low. The syllable closes on ง and is live, and ไม้โท on a low-class initial gives the high tone. khrang, high.
- ละ. ล is low class, the vowel is short and nothing closes the syllable, so it is dead. Low class, short, dead: high tone. la.
- ก่อน. ก is mid class, ends on น and is live, and ไม้เอก on a mid-class initial gives low. korn, low.
- หลัง. The ห is not pronounced. It is there to lend its high class to ล, which has none of its own, and a high-class live syllable with no mark is rising. lang, rising. That is the silent leading ห doing exactly what it exists for.
Two of the four turn on a tone mark and one turns on a letter that makes no sound. Phayan is an app for learning to read Thai script, and it teaches those rules letter by letter from zero, with audio on every word and progress kept on the device without an account. The point of learning them in that order is a page like this one: a bag handed over a counter, in words nobody set out to teach you.
What reading the bag does and does not settle
Being able to read วิธีใช้ tells you the quantity, the frequency and the timing. It does not tell you whether the medicine suits you, what it interacts with, or whether the person behind the counter understood the question you asked in English. Thai pharmacies are staffed by licensed pharmacists and the counter is the right place for all three of those.
What reading does buy you is the ability to check. A dosage line you can decode is a line you can repeat back, and repeating it back is how a misunderstanding at the counter surfaces before you are on the far side of the city. That is the whole value of the script here, and it is worth being honest that it stops there.
Frequently asked questions
What does ครั้งละ mean on a Thai medicine label?
Per dose. ละ divides by whatever word sits in front of it, so ครั้งละ 1 เม็ด is one tablet per dose and วันละ 3 ครั้ง is three doses per day, and reading only the first of the two is how a label gets misread. The same particle prices fruit at a market, where กิโลละ 60 is sixty baht a kilo. Phayan teaches ละ as an ordinary word rather than as pharmacy vocabulary, which is why it transfers between the two.
How do I tell ก่อนอาหาร from หลังอาหาร?
By the first letter, and the two are not lookalikes. ก่อนอาหาร opens with ก and carries ไม้เอก above it, and means before food; หลังอาหาร opens with ห, carries no mark, and means after food. Find อาหาร on the line and the word immediately before it is the instruction. The ห in หลัง is silent and exists only to make the syllable rising, which is the rule Phayan drills rather than the word.
Is it safe to rely on my own reading of a Thai pharmacy label?
For the dosage line, reading gets you the quantity, the frequency and the timing, and that is genuinely useful. It does not tell you whether the medicine is right for you, and Thai pharmacies are staffed by licensed pharmacists whose job that is, so the sensible use of the script is to repeat the line back at the counter and have it confirmed. Phayan teaches reading, not medicine, and a phrase-led app such as Ling will get you further with the spoken half of that conversation.
What is the difference between ยาอันตราย and a warning?
ยาอันตราย is a licensing class under Thai drug law and means the product must be handed over by a pharmacist rather than picked off a shelf. On a wall the same word อันตราย is a plain hazard statement, so a reader who learned it from signage will read a box as far more alarming than it is. The genuine warnings sit under คำเตือน and ข้อควรระวัง further down the label. Phayan teaches อันตราย as a word with one spelling and more than one job, which is the usual situation in Thai.
The pharmacist wrote the dose by hand. How am I supposed to read that?
Read the numbers first and the words second, because the numbers are almost always in Arabic digits and survive a fast hand intact. The words on a handwritten bag are a very small set, so ครั้งละ, วันละ, เม็ด, ก่อนอาหาร and หลังอาหาร cover most of what is written, and a familiar word is recoverable from far less ink than an unfamiliar one. An Anki deck of photographed labels is a reasonable way to build that familiarity, and Phayan supplies the decoding underneath it, one letter at a time with audio on every word.