This medication is used to treat or prevent a lack of thiamine (deficiency) when the form taken by mouth cannot be used or would not work as well as the injection. Thiamine is a B vitamin that helps your body to use carbohydrates for energy. It is also important for normal function of your heart, muscles, and nervous system. Most people get enough thiamine in their diet, but certain health conditions (e.g., 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 (e.g., confusion, psychosis).
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 persist or worsen, tell your doctor or pharmacist promptly. Remember that your doctor has prescribed this medication because he or she has judged that the benefit to you is greater than the risk of side effects. Many people using this medication do not have serious side effects. Tell your doctor right away if you have any serious side effects, including: bluish lips/skin/nails, dark/tarry stools. A very serious allergic reaction to this drug is rare. However, get medical help right away if you notice any symptoms of a serious allergic reaction, including: rash, itching/swelling (especially of the face/tongue/throat), severe dizziness, trouble breathing. This is not a complete list of possible side effects. If you notice other effects not listed above, contact your doctor or pharmacist. In the US - Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088 or at www.fda.gov/medwatch.
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