Vitamin B12 is important for the production of red blood cells and for the maintenance of a healthy nervous system. Vitamin B12 injection is used to treat vitamin B12 deficiency. Magnesium injection is used to correct low levels of magnesium in the blood, according to Drugs.com. Chromium injection is used to treat low levels of chromium in the body. Patients may experience side effects from vitamin B12, magnesium and chromium injections.
Irritation at injection Site
Patients may experience redness and slight pain at the sites of injecting B12 complex, magnesium and chromium, according to Drugs.com. Persistent pain accompanied by warmth at the injection site, swelling, itching and foul-smelling drainage are signs of infection at the injection site. Consult a doctor immediately when these signs are noted. Patients may also develop scars at injection sites if they use the same injection site frequently. Patients are advised to rotate the injection sites in order to prevent scar formation.
Severe Allergic Reaction
Patients may experience severe allergic reactions after injecting B12 complex, magnesium and chromium injections due to hypersensitivity to ingredients used to make the vitamin and mineral supplements. Signs and symptoms of allergic reactions include problems breathing; unusual hoarseness; wheezing; rashes; itching; swelling of the face, eyelids, lips, tongue and mouth; chest pain; chest tightness; fever, and chills.
Blood Vessel and Nerve Damage
B12 complex, chromium and magnesium injections are administered as deep intramuscular injections in various muscles in the body, according to Drugs.com. There is danger of hitting blood vessels and nerves during injections. In order to assess whether a blood vessel has been hit during an intramuscular injection, the syringe plunger should be drawn back to check for the presence of blood before the drugs are administered. If blood is noted, another site should be used for the injections. Hitting nerves during injections may cause permanent nerve damage.
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