If your family sent you a photo of Taiwan’s A25, a Japanese bottle marked A50 is not simply the same medicine in a stronger pack. Match the market and full product name before buying.
This guide compares Taiwan’s 合利他命－愛糖衣錠25毫克 with Japan’s アリナミンA50. Product information checked: 12 November 2026.
First, match the actual box
Look for 合利他命－愛 and 25毫克. This photograph does not establish the tablet count.
Look for アリナミンA50. The official example shown is a 170-tablet pack.
Unaltered official product photographs: Alinamin Pharmaceutical Taiwan and Alinamin Pharmaceutical Japan. Displayed for identification, not to scale; photo credits and sources are below. Pack size is not a measure of strength.
A25 is a Taiwan medicine supplied under physician, pharmacist or pharmacy-assistant guidance. A50 is a Japanese Class 3 OTC medicine. Neither is an ordinary food supplement. Availability on an official website does not establish shop stock or permission to import it.
25 and 50: compare the right amount
A25 contains 25 mg of fursultiamine, a vitamin B1 derivative, per tablet. A50 contains 50 mg per tablet. That does not mean “twice as effective.”
TAIWAN A25
25 mg × 4 tablets
100 mg in the daily maximum
The daily total is divided into 2–3 doses.
JAPAN A50
50 mg × 2 tablets
100 mg in the daily maximum
The daily amount is taken once.
This diagram is arithmetic, not a suggestion to take the maximum or switch products. Follow the directions for the medicine actually being used.
| Ingredient | A25: 4 tablets | A50: 2 tablets |
|---|---|---|
| Fursultiamine (B1 derivative) | 100 mg | 100 mg |
| Riboflavin (B2) | 10 mg | 10 mg |
| Pyridoxine hydrochloride (B6) | 10 mg | 10 mg |
| Cyanocobalamin (B12) | 20 micrograms | 20 micrograms |
The B1 comparison uses fursultiamine-equivalent amounts. The labels’ hydrochloride-salt figures have a small rounding difference, so this is not a claim of identical salt weights, excipients or complete formulations. Matching these four totals does not establish therapeutic equivalence or interchangeability.
Keep the two schedules separate
Taiwan A25
The manufacturer’s directions for ages 15 and over are 3–4 tablets in total per day, divided into 2–3 doses after meals. Swallow without chewing. Three or four tablets is the daily total, not the amount for each dose. Do not invent a different division or use A50’s once-daily schedule.
Japan A50
For ages 15 and over: 1–2 tablets once daily, immediately after a meal, with water or warm water. Do not chew. Under 15: do not take. Do not use A25’s multiple-dose schedule.
What about someone under 15?
A25’s Taiwan manufacturer page gives directions for ages 15+. The current TFDA information gives an adult regimen and says children aged six and under need a physician’s assessment before use. It does not give a numerical pediatric regimen. That warning does not authorize self-directed use at ages 7–14. Do not calculate a child’s dose from these adult figures; seek qualified local advice for anyone under 15.
Similar ingredients do not mean identical approved uses
Taiwan A25 lists conditions caused by deficiencies of vitamins B1, B6 and B12, and nutritional supplementation in circumstances including physical fatigue. Japan A50 lists B1 supplementation during physical fatigue, pregnancy or breastfeeding, or reduced strength during or after illness; it also lists relief of specified symptoms such as neuralgia, muscle or joint pain, numbness of the hands and feet, constipation and eye strain, and beriberi. Read the actual local label rather than transferring one product’s wording to the other.
Neither label means that all fatigue, numbness or pain is caused by a vitamin deficiency. Do not let a product comparison delay assessment of persistent or worsening symptoms.
Before use: the warnings are not interchangeable
Do not combine these products or substitute one for the other on the strength of this table. Show a pharmacist any other vitamin products and medicines you use. A50’s manufacturer advises asking the dispensing pharmacy about combinations with prescription medicines; this is not a blanket claim that every combination is prohibited.
Taiwan A25: follow the current TFDA precautions
- Do not use if you have a known or previous severe allergy to its ingredients.
- If pregnant, possibly pregnant or breastfeeding, consult a physician, pharmacist or pharmacy assistant before use. The nutritional-supplementation indication does not remove this precaution.
- Known cobalt allergy requires consultation before use. The current information notes cobalt content and reports of allergic contact dermatitis.
- Stop immediately and seek advice for rash, nausea, heartburn, stomach discomfort or diarrhea. The TFDA information also says to stop and seek a physician’s assessment if any discomfort occurs.
- The current TFDA information lists a potential peripheral neuropathy risk (a risk involving nerves outside the brain and spinal cord). That statement provides no numerical threshold or frequency. Do not infer a safe dose or duration beyond the label, or respond to new symptoms by increasing the dose.
Japan A50: follow its own leaflet
- Stop immediately and consult a physician, pharmacist or registered medicine seller if rash, redness, itching, nausea, vomiting or mouth inflammation occurs.
- Stop and consult if loose stools or diarrhea persist or worsen.
- If there is no improvement after about one month, stop and consult. This A50 timeline must not be applied to A25, and it is not permission to wait through adverse effects or worsening symptoms.
These are selected decision points, not a replacement for the complete current instructions supplied with the medicine.
Keep the original packaging
A25’s current TFDA information specifies storage below 25°C, away from sunlight, tightly closed and out of children’s reach; use within six months of opening. A50 specifies a cool, dry place away from sunlight, tightly closed and out of children’s reach, and prompt use aiming for within six months after opening. Do not transfer either medicine to another container. Remove the packing material after opening, record the opening date and respect the expiry date.
At the shelf: three checks are enough
- Match the name and market. Send a photo back if the request says A25 but the shelf says A50.
- Check the schedule and age. A daily total and a per-dose amount are different things.
- Confirm before replacing. Matching four ingredient totals is not permission to change an existing medicine.
Choosing among Japan’s A, A50 and EX products instead? Read the five-product Alinamin guide. For this comparison in Traditional Chinese, see Taiwan A25 versus Japan A50.
Official sources and photo credits
- Alinamin Taiwan: A25 ingredients and manufacturer directions
- TFDA: current A25 product information and precautions (HTML)
- Alinamin Taiwan lineup: official A25 photograph
- Alinamin Japan: A50 directions, ingredients, questions and official 170-tablet photograph
- Alinamin A50: Japanese package leaflet (PDF)
Official photographs remain the property of their respective rights holders. They are used here only to distinguish the two market-specific products; this article does not claim manufacturer endorsement.
