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Typically, intramuscular injections might be given daily during the first week, followed by weekly shots for one month, and then every month or two months for life

Obesity Pharmacotherapy: Current Perspectives and Future Directions, Misra M., Journal (Current Cardiology Reviews, Volume 9, Issue 1, February 2013, Pages 3354)

Does Low Vitamin B12 Cause Hair Loss
Insulin-like growth factor-I reverts testicular atrophy in rats with advanced cirrhosis

However, these side effects are temporary and resolve on their own as your body adjusts