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Also theres a possibility that the needle hit a larger blood vessel which has bled into the muscle thus causing pain and stiffness

Injecting the medication should proceed slowly and steadily

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In some cases, injections may be given daily or several times per week at the beginning of therapy, and then the interval may be extended or switched to oral tablets once vitamin levels and symptoms improve

The treatment, in this case, usually follows by means of having daily injections for a week or so, then injections every few days for a month, after which maintenance doses are usually given every one to two months for life