Meaning of Thai drug registration number

The registration number is what shows the drug has passed the Food and Drug Administration review process that has efficiency and safety according to the standards.

How do I know if a product is registered as a medicine?

We can see it on the side of the package, label or pill pack. It will say Reg. No. followed by a series of numbers and letters as follows:

– The numbers 1 or 2 that precede the letters are for modern medicines only. They have the following meanings:

  • Number 1 means a drug that has a single active ingredient.
  • Number 2 means a drug that has 2 or more active ingredients.

– Next is the letters A – N, meaning as in the table below.

Modern medicineTraditional medicine
A is human medicine manufactured in Thailand
B is human medicine repacked in Thailand
C is human medicine import or ordered into Thailand
D is animal medicine manufactured in Thailand
E is animal medicine repacked in Thailand
F is animal medicine import or ordered into Thailand
G is human medicine manufactured in Thailand
H is human medicine repacked in Thailand
K is human medicine import or ordered into Thailand
L is animal medicine manufactured in Thailand
M is animal medicine repacked in Thailand
N is animal medicine import or ordered into Thailand

– The next digit is the number in the order of registration of the drug formula.

– The last two digits mean the year (in Buddhist era) of registration.

For Example

  • 1A 12/35 means modern medicine for humans manufactured in Thailand. There is only one active ingredient. The registration number was 12 in year 1992. (2535 B.E. = 1992 A.D.)
  • 2C 234/45 means modern medicine for humans import or ordered into Thailand. There are two or more active ingredients. The registration number was 234 in year 2002. (2545 B.E. = 2002 A.D.)
  • 2D 55/56 means modern medicine for animals manufactured in Thailand. There are two or more active ingredients. The registration number was 55 in year 2013. (2556 B.E. = 2013 A.D.)
  • G 21/29 means traditional medicine for humans manufactured in Thailand. The registration number was 21 in year 1986. (2535 B.E. = 1986 A.D.)

In addition, some drug registrations have appended parentheses, such as (N), (NG), which indicate additional attribute. has the following meanings:

Additional attributeThe origin of the abbreviation
(E) = produced for export.
(N ) = unconditional new drug
(NC) = new drugs with condition
(B) = biologic drugs
(NB) = new biologic drugs
(NBC) = new biologic drugs with condition
(NG) = new generic drugs
(P) = orphan drugs
E = export
N = new drugs
NC = new drugs with condition
B = biologic drugs
NB = new biologic drugs
NBC = new biologic drugs with condition
NG = new generic drugs
P = orphan drugs

for example

  • 1A 22/56 (B) means modern medicine for humans that is biologic drugs manufactured in Thailand. There is only one active ingredient. The registration number was 22 in year 2013. (2556 B.E. = 2013 A.D.)
  • 1A 55/58 (NG) means modern medicine for humans that is a new generic drug manufactured in Thailand. There is only one active ingredient. The registration number was 55 in year 2015. (2558 B.E. = 2015 A.D.)

Reference