tiredness after b12 injection I Feel Tired All the Time. Do I Need a Shot?: Shawn Veiseh, M.D.: Family Medicine b12 injection makes me sleepy

Based on your detailed feedback, we may suggest: Splitting the full dose into two smaller injections spaced apart

Adverse reactions can occur when trazodone hydrochloride tablets are discontinued [see Warnings and Precautions ( 5.8)]

Cyanocobalamin acts as a precursor for the bioactive forms of vitamin B12, methylcobalamin, and adenosylcobalamin, which are critical co-factors in DNA synthesis and red blood cell production

Some individuals report a sensation of body swelling or warmth, but these symptoms typically resolve on their own within a few hours

Hives might not cause any discoloration on darker skin, so be alert for raised patches or weltsthose could be a sign of urticaria

You should not have to continually suffer with all those symptoms (especially the neurological ones) and have your GP (or GP's) do nothing to to try and determine the cause - and help.you get well