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Oral Rehydration Solution OS-1 Series

Approved by the Consumer Affairs Agency of Japan
Medical uses for the diseased (Individual Approval)

OS-1 is an oral rehydration solution used in dietary therapy (oral rehydration therapy) for dehydration. This product is approved as a food for persons with medical conditions and is intended to provide water and electrolytes in order to maintain proper water and electrolyte balance in persons with mild-to-moderate dehydration.

Product Features

OS-1 series are beverages that meet the oral rehydration therapy guidelines recommended by the World Health Organization (WHO). The composition of OS-1 is based on the guidelines of the American Academy of Pediatrics, which has promoted the use of oral rehydration therapy for persons who are dehydrated.

Product Line-up

You can find detailed product information below.
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OS-1 500ml plastic bottle
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OS-1 300ml plastic bottle
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OS-1 Apple Flavor 500ml plastic bottle
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OS-1 Apple Flavor 300ml plastic bottle
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OS-1 Jelly

All products mentioned are sold in Japan.

Instructions for use

  • OS-1 should be taken according to the following guidelines and intake adjusted based on the degree of dehydration.

    ・Older children and adults (including elderly adults): 500-1000 ml(g) / day
    ・Young children: 300-600 ml(g) / day
    ・Infants: 30-50 ml(g) / kg / day
    Note: A unit "g" applies to only OS-1 Jelly

  • OS-1 should be used as directed by a physician as a dietary therapy for dehydration.
  • Consult a physician, pharmacist, nurse, registered dietitian, or registered salesperson before consuming OS-1.
  • OS-1 is intended only for the dietary treatment of dehydration, not for the treatment of any underlying disease (even if a large volume is consumed).

Precautions for handling OS-1

  • Do not freeze the product. If the product is frozen, the contents may expand and damage the container.
  • Promptly consume after opening the container. Leaving unconsumed product at room temperature may result in damage of the container or propulsion of the cap.

Precautions for handling OS-1 Jelly

  • Do not freeze or heat OS-1 Jelly. If the product is frozen or heated, the jelly may disintegrate.
  • Some water may be separated from the product depending on how the product is stored and handled.
  • Be careful not to spill the contents when opening the container.
  • After opening the container, consume the appropriate amount of OS-1 Jelly promptly. Store any unused product in the refrigerator. Make sure that cap is properly resealed.
  • To avoid accidental swallowing, do not put cap into the mouth.
FAQ about this product
Product Site of OS-1 (in Japanese)

Product Site of OS-1 (in Japanese)
Oral rehydration solution suitable for replenishing and maintaining water and electrolyte levels