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 and OS-1 Jelly 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 280ml 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, 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

  1. 1Do not freeze the product. If the product is frozen, the contents may expand and damage the container.
  2. 2Promptly 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

  1. 1Do not freeze or heat OS-1 Jelly. If the product is frozen or heated, the jelly may disintegrate.
  2. 2Some water may be separated from the product depending on how the product is stored and handled.
  3. 3Be 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.
  4. 4To avoid accidental swallowing, do not put cap and ring 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