HSA Reclassified Drug | Exemptions For Supply of Famotidine Without Prescription


Eligible Active Ingredient: Famotidine. As an oral preparation
With Effective From: 10-Jan-2000
Indication Permitted: Short-term relief of heartburn, dyspepsia and hyperacidity.
Maximum Daily Dose: 20mg
Maximum Supply per Transaction: 14 days
Minimum Age of User:
Patient Information Leaflet from HSA/PSS: Download PIL (Link to HSA website)

Mechanism of Action of Famotidine

Famotidine binds competitively to H2-receptors located on the basolateral membrane of the parietal cell, blocking histamine affects. This competitive inhibition results in reduced basal and nocturnal gastric acid secretion and a reduction in gastric volume, acidity, and amount of gastric acid released in response to stimuli including food, caffeine, insulin, betazole, or pentagastrin.

Additional Information of Famotidine

Pharmacology Class: Drugs For Peptic Ulcer And Gastro-Oesophageal Reflux Disease (Gord)
Therapeutic Class: Drugs For Acid Related Disorders
Chemical Class: H2-Receptor Antagonists
Synonyms: (1-Amino-3-(((2-((diaminomethylene)amino)-4-thiazolyl)methyl)thio)propylidene)sulfamide | 3-(((2-((Aminoiminomethyl)amino)-4-thiazolyl)methyl)thio)-N-(aminosulfonyl)propanimidamide | 3-(((2-((Diaminomethylene)amino)-4-thiazolyl)methyl)thio)-N(sup 2)-sulfamoylpropionamidine | Famotidina | Famotidinum | N-Sulfamoyl-3-((2-guanidinothiazol-4-yl)methylthio)propionamide

Show All HSA-registered therapeutic products granted exemption to supply without prescription


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

HSA-Registered Products Containing Famotidine As an oral preparation

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This list is not exhaustive. HSA collaborates with Pharmaceurical Society of Singapore (PSS) to review the appropriate use of therapeutic products in the community from time to time. Hence, HSA may enable the supply of a Prescription Only Medicine (POM) by pharmacists without a prescription, upon review that the product can be used in a safe and effective manner under the supervision of a pharmacist. This can be effected through legislative mechanisms in the absence of an application made by the product registrant to reclassify the therapeutic product, subject to to conditions including indication, strength, maximum daily dose, maximum supply quantity, and age restriction.