Product Information

Registration Status: Active

ANTAMIN TABLET 4mg is approved to be sold in Singapore with effective from 1989-04-27. It is marketed by APEX PHARMA MARKETING PTE LTD, with the registration number of SIN02658P.

This product contains Chlorpheniramine 4mg in the form of TABLET. It is approved for ORAL use.

This product is manufactured by XEPA-SOUL PATTINSON (MALAYSIA) SDN BHD in MALAYSIA.

It is a Pharmacy Only Medicine that can be obtained from a pharmacist at a retail pharmacy.



A histamine H1 antagonist used in allergic reactions, hay fever, rhinitis, urticaria, and asthma. It has also been used in veterinary applications. One of the most widely used of the classical antihistaminics, it generally causes less drowsiness and sedation than promethazine. [PubChem]


For the treatment of rhinitis, urticaria, allergy, common cold, asthma and hay fever.

Mechanism of Action

Chlorpheniramine binds to the histamine H1 receptor. This blocks the action of endogenous histamine, which subsequently leads to temporary relief of the negative symptoms brought on by histamine.


Well absorbed in the gastrointestinal tract.
Primarily hepatic via Cytochrome P450 (CYP450) enzymes.


Oral LD50 (rat): 306 mg/kg; Oral LD50 (mice): 130 mg/kg; Oral LD50 (guinea pig): 198 mg/kg [Registry of Toxic Effects of Chemical Substances. Ed. D. Sweet, US Dept. of Health & Human Services: Cincinatti, 2010.] Also a mild reproductive toxin to women of childbearing age.

Active Ingredient/Synonyms

1-(p-chlorophenyl)-1-(2-pyridyl)-3-dimethylaminopropane | 1-(p-chlorophenyl)-1-(2-pyridyl)-3-N,N-dimethylpropylamine | 2-[p-chloro-α-[2-(dimethylamino)ethyl]benzyl]pyridine | 3-(p-chlorophenyl)-3-(2-pyridyl)-N,N-dimethylpropylamine | Chlorophenylpyridamine | Chlorphenamin | Chlorphenaminum | Chlorpheniramine | Chlorpheniramine polistirex | Chlorpheniraminum | Clorfenamina | Clorfeniramina | γ-(4-chlorophenyl)-N,N-dimethyl-2-pyridinepropanamine | γ-(4-chlorophenyl)-γ-(2-pyridyl)propyldimethylamine | Chlorphenamine |

Source of information: Drugbank (External Link). Last updated on: 3rd July 18. *Trade Name used in the content below may not be the same as the HSA-registered product.


  1. Health Science Authority of Singapore - Reclassified POM
  2. Drugbank