Ohta’ s Isan

  • Type-2 OTC medicine
  • Powder


Overdrinking, Heartburn, Stomach discomfort, Gastrasthenia, Heaviness in the stomach, Overeating, Stomachache, Indigestion, For promoting digestion, Loss of appetite, Hyperacidity, Feeling of stomach and abdominal distention, Nausea (stomach retching, retching due to hangovers and overdrinking, and feeling of sickness), Vomiting, Heaviness in the chest, Belching, Heaviness in the stomach.


  • 75 g
  • 140 g
  • 210 g


Comprehensive gastrointestinal medicine in high favor with the public
for a long time and characterized by containing natural materials.

  1. Feature01

    Seven kinds of stomachics help to activate weaknened stomach.

    Seven kinds of stomachics compounded effectively activate weaknened stomach and improve the stomach discomfort caused by overdrinking, overeating and heaviness in the stomach.

  2. Feature02

    Four kinds of antacids are effective in heartburn, stomachache, etc.

    Four kinds of antacids with different duration of activity exert in heartburn, stomachache and stomach discomfort.

  3. Feature03

    Unique production technique brings about fresh taste.

    This is a powder produced by unique process so as not to get away the active ingredients of aromatic stomatics. The aromatic sense of herbal medicines combined with fresh feeling by l-menthol brings about fresh taste.

*There is also Ohta’s Isan〈Sachet〉available in which one sachet contains one dose. It is convenient for carrying with you outside.


Please take the following amount after or between meals.

Age Dose Times / day
For adults
(15 years old and over)
1.3 g 3 times daily
8-14 years old 0.65 g
Under 8 years old Not to be taken

NOTE on Directions
* "Between meals" means 2 to 3 hours after meals.
*Shelf life: Look at the bottom of the product.


Per daily dose (1.3 g)

Category Ingredient Quantity Function
Stomachics Cinnamon Bark 92 mg Unique aromatic sense helps weakened stomach work better and adjust the secretion of gastric juice.
Fennel 24 mg
Nutmeg 20 mg
Clove 12 mg
Citrus Unshiu Peel 22 mg
Gentian 15 mg A kind of bitterness helps damaged stomach activate and serves as adjuster of the secretion of gastric juice.
Powdered Picrasma Wood 15 mg
Antacids Sodium Bicarbonate 625 mg Various kinds of antacids with different duration of activity such as rapid-acting and continuous-acting neutralize excessive gastric acid and adjust the acidity in the stomach.
Precipitated Calcium Carbonate 133 mg
Magnesium Carbonate 26 mg
Synthetic Aluminum Silicate 273.4 mg
Digestants Biodiastase 40 mg Combined digestive enzyme helping digest mainly starch, protein, etc.

[additive] l-Menthol


See all

Ohta’s Isan FAQ

  • Q

    Can I use it together with other medications?


    Combination use may affect the effect of the product. Consult your physician or pharmacist because it depends on the type of medicine which is combined.

  • Q

    Can I take the product without water?


    Take the product with water or lukewarm water. If you do not like to take a powder, put it in your mouth at first, then put and hold water in your mouth, and finally stir well with your tongue a few times for easy use.

  • Q

    Is any shelf life defined after opening the can?


    Since the storage environment after opening is different, a certain shelf life cannot be defined. Store in a cool place with less moisture out of direct sunlight, and use it as soon as possible to maintain quality after opening even within the period of the shelf life.