Thiamine HCl is a B vitamin that helps your body to use carbohydrates for energy and prevents thiamine deficiency. It is given by injection when the oral form cannot be used or is not effective. Learn how to use it, what side effects to watch out for, and what precautions to take. Thiamin injection is a sterile solution of thiamin hydrochloride administered to treat or prevent thiamin deficiency or related conditions. Thiamin (vitamin B1) is an essential nutrient that plays a crucial role in energy metabolism and nervous system function. Thiamine is a prescription and over-the-counter (OTC) vitamin, also called vitamin B1. Learn about side effects, drug interactions, dosages, warnings, and more. Thiamine Synonym : Vitamin B1 Mechanism : Vitamin B1 is a water-soluble B complex vitamin. Vitamin B1 combines with adenosine triphosphate (ATP) to form thiamine pyrophosphate, also known as co carboxylase, a coenzyme. Its role in carbohydrate metabolism is the decarboxylation of pyruvic acid and alpha-ketoacids to acetaldehyde and carbon dioxide. Increased levels of pyruvic acid in the blood indicate vitamin B1 deficiency. Indication : Maple syrup urine disease (MSUD)-thiamine sensitive ...