Vitamin B1 is found in many foods including yeast, cereal grains, beans, nuts, and
meat. It is often used in combination with other B vitamins, and found in many
vitamin B complex products.

It is used for the treatment and prevention of vitamin B1 deficiency. It is also used to
treat Beriberi and Wernicke's encephalopathy.

 Allergic reaction
 Skin irritation
 Cough
 Decreased blood pressure
 Difficulty in swallowing
 Breathlessness
 Facial swelling
 Increased sweating

Vitamin B1 is LIKELY SAFE for pregnant or breast-feeding women if taken in proper
quantity.
Alcoholics and people with cirrhosis often have low levels of Vitamin B1. Nerve pain
in alcoholism can be worsened by Vitamin B1 deficiency. These people might
require Vitamin B1 supplements.
People undergoing hemodialysis treatments might have low levels of Vitamin B1. 
People with heart failure might have low levels of Vitamin B1. 
People that are critically ill such as those that had surgery might have low levels of
Vitamin B1.