Commonly used brand name(s):
In the U.S.
Available Dosage Forms:
Therapeutic Class: Nutritive Agent
Pharmacologic Class: Vitamin B
Vitamins are compounds that you must have for growth and health. They are needed in small amounts only and are usually available in the foods that you eat. Thiamine (vitamin B 1) is needed for the breakdown of carbohydrates.
Some conditions may increase your need for thiamine. These include:
Also, the following groups of people may have a deficiency of thiamine:
Increased need for thiamine should be determined by your health care professional.
Lack of thiamine may lead to a condition called beriberi. Signs of beriberi include loss of appetite, constipation, muscle weakness, pain or tingling in arms or legs, and possible swelling of feet or lower legs. In addition, if severe, lack of thiamine may cause mental depression, memory problems, weakness, shortness of breath, and fast heartbeat. Your health care professional may treat this by prescribing thiamine for you.
Thiamine may also be used for other conditions as determined by your health care professional.
Claims that thiamine is effective for treatment of skin problems, chronic diarrhea, tiredness, mental problems, multiple sclerosis, nerve problems, and ulcerative colitis (a disease of the intestines), or as an insect repellant or to stimulate appetite have not been proven.
Injectable thiamine is administered only by or under the supervision of your health care professional. Other forms of thiamine are available without a prescription.
Once a medicine or dietary supplement has been approved for marketing for a certain use, experience may show that it is also useful for other medical problems. Although this use is not included in product labeling, thiamine is used in certain patients with the following medical conditions:
For good health, it is important that you eat a balanced and varied diet. Follow carefully any diet program your health care professional may recommend. For your specific dietary vitamin and/or mineral needs, ask your health care professional for a list of appropriate foods. If you think that you are not getting enough vitamins and/or minerals in your diet, you may choose to take a dietary supplement.
Thiamine is found in various foods, including cereals (whole-grain and enriched), peas, beans, nuts, and meats (especially pork and beef). Some thiamine in foods is lost with cooking.
Vitamins alone will not take the place of a good diet and will not provide energy. Your body also needs other substances found in food such as protein, minerals, carbohydrates, and fat. Vitamins themselves often cannot work without the presence of other foods.
The daily amount of thiamine needed is defined in several different ways.
Normal daily recommended intakes in milligrams (mg) for thiamine are generally defined as follows:
|Persons||U.S. (mg)||Canada (mg)|
|Infants and childrenBirth to 3 years of age||0.3–0.7||0.3–0.6|
|4 to 6 years of age||0.9||0.7|
|7 to 10 years of age||1||0.8–1|
|Adolescent and adult males||1.2–1.5||0.8–1.3|
|Adolescent and adult females||1–1.1||0.8–0.9|
If you are taking this dietary supplement without a prescription, carefully read and follow any precautions on the label. For this supplement, the following should be considered:
Tell your doctor if you have ever had any unusual or allergic reaction to thiamine or any other medicines. Also tell your health care professional if you have any other types of allergies, such as to foods, dyes, preservatives, or animals. For non-prescription products, read the label or package ingredients carefully.
Problems in children have not been reported with intake of normal daily recommended amounts.
Problems in older adults have not been reported with intake of normal daily recommended amounts. Studies have shown that older adults may have lower blood levels of thiamine than younger adults. Your health care professional may recommend that you take a vitamin supplement that contains thiamine.
Studies in women suggest that this medication poses minimal risk to the infant when used during breastfeeding.
Although certain medicines should not be used together at all, in other cases two different medicines may be used together even if an interaction might occur. In these cases, your doctor may want to change the dose, or other precautions may be necessary. Tell your healthcare professional if you are taking any other prescription or nonprescription (over-the-counter [OTC]) medicine.
Certain medicines should not be used at or around the time of eating food or eating certain types of food since interactions may occur. Using alcohol or tobacco with certain medicines may also cause interactions to occur. Discuss with your healthcare professional the use of your medicine with food, alcohol, or tobacco.
The dose of thiamine will be different for different patients. Follow your doctor's orders or the directions on the label. The following information includes only the average doses of thiamine. If your dose is different, do not change it unless your doctor tells you to do so.
The amount of medicine that you take depends on the strength of the medicine. Also, the number of doses you take each day, the time allowed between doses, and the length of time you take the medicine depend on the medical problem for which you are using the medicine.
If you miss a dose of thiamine, take it as soon as possible. However, if it is almost time for your next dose, skip the missed dose and go back to your regular dosing schedule. Do not double doses.
If you miss taking a vitamin for 1 or more days there is no cause for concern, since it takes some time for your body to become seriously low in vitamins. However, if your health care professional has recommended that you take this vitamin, try to remember to take it as directed every day.
Store the dietary supplement in a closed container at room temperature, away from heat, moisture, and direct light. Keep from freezing.
Keep out of the reach of children.
Do not keep outdated medicine or medicine no longer needed.
Along with its needed effects, a medicine may cause some unwanted effects. Although not all of these side effects may occur, if they do occur they may need medical attention.
Check with your doctor immediately if any of the following side effects occur:Rare - Soon after receiving injection only
Other side effects not listed may also occur in some patients. If you notice any other effects, check with your healthcare professional.
Call your doctor for medical advice about side effects. You may report side effects to the FDA at 1-800-FDA-1088.
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