how long do the effects of b12 injections typically last Quickly Does a Shot Work? What to Expect Vitamin B12 Injections: What You

doi: 10.3324/haematol.2020.268656

When to Contact a Medical Professional Contact your provider right away if you have: Unexplained fever with back pain Back pain after a severe blow or fall Redness or swelling on the back or spine Pain traveling down your legs below the knee Weakness or numbness in your buttocks, thigh, leg, or pelvis Burning with urination or blood in your urine Pain that is worse when you lie down, or awakens you at night Severe pain and you cannot get comfortable Loss of control of urine or stool (incontinence) Also contact your provider if: You have been losing weight unintentionally (not on purpose) You use steroids or intravenous drugs You have had back pain before, but this episode is different and feels worse This episode of back pain has lasted longer than 4 weeks Prevention Prevention varies, depending on the cause of the nerve damage

Do not microwave, heat in hot water, or otherwise artificially warm the medication

Take the Blue or Yellow Line to King Street-Old Town station

At first, injections might be given daily or weekly

Side effects are generally mild and may include slight redness or soreness at the injection site