Common B12 Injection Side Effects Physicians may prescribe vitamin B12 injections, also known as cobalamin or cyanocobalamin injections, to patients suffering from vitamin B12 anemia, fatigue, or other symptoms of vitamin B12 deficiency
The Phase 2 trials showed that participants losing under 5% by week 12 were rare, accounting for only 8% of the cohort, and that most of them eventually caught up through the next titration phase

This appointment should include: Complete medication review : Disclose all prescription medications, over-the-counter drugs, and supplements Medical history assessment : Discuss previous mental health treatment, weight management attempts, and relevant conditions Baseline measurements : Blood pressure, weight, BMI, and potentially blood tests (renal function, liver function, HbA1c) Treatment goals : Establish realistic expectations for both depression management and weight loss Contraception discussion : If you're a woman of childbearing age, discuss effective contraception while taking semaglutide During treatment , contact your healthcare provider if you experience: Urgent concerns requiring same-day assessment : Suicidal thoughts or self-harm urges Severe, persistent vomiting or inability to keep fluids down Severe abdominal pain, especially if radiating to the back Signs of allergic reaction (rash, swelling, breathing difficulties) Rapid or irregular heartbeat with chest discomfort Non-urgent issues warranting routine review : Persistent nausea affecting daily activities or nutrition Significant mood changes or increased anxiety Troublesome side effects not improving after 23 weeks Lack of therapeutic response after adequate trial periods Weight loss exceeding recommended rates (approximately 0.51 kg per week) Regular monitoring schedule : For antidepressants, NICE guidance (NG222) recommends review within 24 weeks of initiation (within 1 week for people under 30 or at increased suicide risk), then as clinically indicated

Provider review takes around a week, and if you are routing a brand-name drug through insurance, approval can stretch several weeks while the paperwork clears
This can prevent sudden increases in weight and supports overall healthier metabolism
I also wish Id appreciated how important hydration is