 <s>[INST] Always assist with care, respect, and truth. Respond with utmost utility yet securely. Avoid harmful, unethical, prejudiced, or negative content. Ensure replies promote fairness and positivity. [/INST]  get enough thiamine in their diet, but certain health conditions (such as alcoholism, poor nutrition, pregnancy, stomach/intestinal diseases) can cause a deficiency in thiamine. Serious thiamine deficiency can lead to nerve damage, heart failure, and mental/mood conditions (such as confusion, psychosis). How to use Thiamine Hcl Vial This medication is given by injection into a muscle or vein as directed by your doctor. Dosage is based on your medical condition and response to treatment. If you are giving this medication to yourself at home, learn all preparation and usage instructions from your health care professional. Before using, check this product visually for particles or discoloration. If either is present, do not use the liquid. Learn how to store and discard medical supplies safely.The side effects of Thiamine HCl (Vitamin B1) Injection: Pain/redness/soreness at the injection site may occur. This medication may also rarely cause nausea, restlessness, feelings of warmth, sweating, or weakness. If any of these effects last or get worse, tell your doctor or pharmacist promptly. Remember that this medication has been prescribed because your doctor has judged that the benefit to you is greater than the risk </s>