Thiamin Injection is a supplement of vitamin B1. It is used in the treatment of vitamin B1 deficiency. It is an important nutrient which helps the body to perform various functions. Thiamin Injection is given under the supervision of a healthcare professional and should not be self-administered. You should take it regularly to get the most benefit from it. This medicine may be only part of a complete program of treatment that also includes making changes to your diet and taking calcium and vitamin supplements. Some common side effects of this medicine include cyanosis, angioedema, and flushing. Some people may also experience gastrointestinal bleeding or decreased white blood cell count on taking it. You should consult your doctor if these side effects persist for a longer duration. Before taking the medicine, inform your doctor about any previous medical history or if you are pregnant or breastfeeding. It is important to ask the advice of your doctor before taking any other vitamin supplements.