can you feel tired after a b12 injection I All the Time. Do I Need Shot?: Shawn Veiseh, M.D.: Family Medicine Is it normal to feel

Common side effects of dexpanthenol include

Here are some common side effects- Common side effects Pain, redness, or swelling at the injection site Mild diarrhea or upset stomach Nausea or vomiting Dizziness Headaches Rare but serious side effects Allergic reaction, including itchiness, hives, difficulty in breathing, or swelling on the face, lips, and throat Irregular heartbeat It is essential to consult with a healthcare provider before starting vitamin B12 injections to ensure they are appropriate for your specific health needs and to receive proper administration guidance

Fatigue is usually the first red flag

That is the reason it is considered relatively safe even at high doses

This introduces the question of injection volume management