Thiamin

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Generic Name: Thiamin Brand Name(s): Generics only. No brands available.

Know the basics

What is thiamin used for?

Thiamin is commonly used for treating or preventing low levels of thiamine (vitamin B1). This vitamin plays an important role in carbohydrate (sugar and starch) metabolism, maintenance of normal growth, and transmission of nerve impulses.

How should I take thiamin?

Take this vitamin by mouth with or without food.

How do I store thiamin?

Thiamin is best stored at room temperature away from direct light and moisture. To prevent drug damage, you should not store thiamin in the bathroom or the freezer. There may be different brands of thiamin that may have different storage needs. It is important to always check the product package for instructions on storage, or ask your pharmacist. For safety, you should keep all medicines away from children and pets.

You should not flush thiamin down the toilet or pour them into a drain unless instructed to do so. It is important to properly discard this product when it is expired or no longer needed. Consult your pharmacist for more details about how to safely discard your product.

Know the precautions & warnings

What should I know before using thiamin?

Tell your doctor or pharmacist:

  • If you are pregnant, planning to become pregnant, or are breastfeeding;
  • If you are taking any prescription or nonprescription medicine, herbal preparation, or dietary supplement;
  • If you have allergies to medicines, foods, or other substances;
  • If you have kidney problems.

Is it safe during pregnancy or breastfeeding?

There are no adequate studies in women for determining risk when using thiamin during pregnancy or while breastfeeding. Please always consult with your doctor to weigh the potential benefits and risks before taking thiamin. Thiamin is pregnancy risk category A, according to the US Food and Drug Administration (FDA).

FDA pregnancy risk category reference below:

  • A=No risk;
  • B=No risk in some studies;
  • C=There may be some risk;
  • D=Positive evidence of risk;
  • X=Contraindicated;
  • N=Unknown.

Know the side effects

What side effects can occur from thiamin?

A serious allergic reaction includes rash, itching/swelling (especially of the face/tongue/throat), severe dizziness, trouble breathing.

Not everyone experiences these side effects. There may be some side effects not listed above. If you have any concerns about a side-effect, please consult your doctor or pharmacist.

Know the interactions

What drugs may interact with thiamin?

Thiamin may interact with other drugs that you are currently taking, which can change how your drug works or increase your risk for serious side effects. To avoid any potential drug interactions, you should keep a list of all the drugs you are using (including prescription drugs, nonprescription drugs, and herbal products) and share it with your doctor and pharmacist. For your safety, do not start, stop, or change the dosage of any drugs without your doctor’s approval.

Does food or alcohol interact with thiamin?

Thiamin may interact with food or alcohol by altering the way the drug works or increase the risk for serious side effects. Please discuss with your doctor or pharmacist any potential food or alcohol interactions before using this drug.

What health conditions may interact with thiamin?

Thiamin may interact with your health condition. This interaction may worsen your health condition or alter the way the drug works. It is important to always let your doctor and pharmacist know all the health conditions you currently have.

Understand the dosage

The information provided is not a substitute for any medical advice. You should ALWAYS consult with your doctor or pharmacist before using thiamin.

What is the dose of thiamin for an adult?

Recommended daily allowance

  • Males: 1.2 mg/day;
  • Females: 1.1 mg/day;
  • Pregnancy/Lactation: 1.4 mg/day.

Beriberi: 5-30 mg intramuscular injection three times daily; then 5-30 mg three times daily for 1 month.

Wernicke Encephalopathy: 100 mg intravenous injection; then 50-100 mg/day until consuming regular balanced diet.

Thiamin Deficiency: 1 tablet or capsule/day.

What is the dose of thiamin for a child?

Recommended daily allowance.

  • 0-6 months: 0.2 mg/day;
  • 6-12 months: 0.3 mg/day;
  • 1-3 years old: 0.5 mg/day;
  • 3-8 years old: 0.6 mg/day;
  • 8-13 years old: 0.9 mg/day;
  • 13-18 years old: 1.2 mg/day (male), 1 mg/day (female).

Deficiency: 10-50 mg/day by oral route in divided doses.

Beriberi: 10-25 mg intramuscular injection or intravenous injection daily or 10-50 mg/dose daily by oral route for at least 2 weeks, then 5-10 mg/day by oral route for 1 month.

How is thiamin available?

Thiamin is available in the following dosage forms and strengths:

  • Applies to thiamine: capsule, solution, tablet, tablet enteric coated;
  • Applies to the following strength(s): 100 mg/mL; 100 mg; 50 mg; 250 mg; 500 mg.

What should I do in case of an emergency or overdose?

In case of an emergency or an overdose, call your local emergency services (115) or go to your nearest emergency room.

What should I do if I miss a dose?

If you miss a dose of thiamin, take it as soon as possible. However, if it is almost time for your next dose, skip the missed dose and take your regular dose as scheduled. Do not take a double dose.

Hello Health Group does not provide medical advice, diagnosis or treatment.

Review Date: January 4, 2017 | Last Modified: January 4, 2017

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