What is B1: Uses, Warnings & Interactions

What is B1: Uses, Warnings & Interactions

Updated May 14, 2025 • Published Apr 8, 2021

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B1 overview

BRAND NAMES:

Optimum Vitamin B-1, Sundown Naturals B1, Vitamin B1 AvPak

Generic Names:

B1

Uses:

Thiamine, another name for Vitamin B-1, is used to treat thiamine-deficiency (not enough thiamine in the body).

Therapeutic Classes:

Nutriceutical, Nutritive Agent

Forms:

Tablet, Capsule, Liquid

How it’s taken:

By mouth

What is B1 used for?

What form(s) does B1 come in

Tablet
Capsule
Liquid

What are common B1 doses?

Bottle 100 Tablets

Common B1 prescriptions

B1
100 tablets bottle

How to take B1

Your doctor will tell you how much and when to take your medicine. Keep all medicine away from children.
You may take your medicine with or without food.
Measure your oral liquid medicine using a marked measuring spoon or medicine cup.
Missing a dose is generally not a cause for concern.

What to do if you miss a dose of B1

You should not use two doses at the same time.
Take the missed dose as soon as possible.
Skip the missed dose if it is almost time for your next dose.
Missing a dose is generally not a cause for concern.

B1 contraindications

You should not use this medicine if you have had an allergic reaction to thiamine (Vitamin B-1).

B1 warnings

Tell your doctor if you are pregnant or breastfeeding, or if you become pregnant.
Swelling of face, lips or eyelids

B1 interactions

Follow your doctor's orders if he or she has given you a special diet.

B1 side effects

Serious Side Effects

Swelling of face, lips or eyelids
Itching or trouble breathing