Pharmaceutical Journal has this supply issue alert from a couple of weeks or so ago:
22 February 2014
Generic hydroxocobalamin injections are currently out of stock from Amdipharm Mercury. The company does not know when supply will resume. The branded product, Cobalin-H, is still available from Amdipharm Mercury. Medical information on 08700 70 30 33. Further information on 020 8588 9273.
Anyone had any problems yet?
Image is of the product in Goldshield livery - I have no idea what it now looks like.