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From http://www.hairfacts.com/methods/rxoral.html :

'Some dermatologists recommend testing vitamin B12 levels in CPA users. CPA can cause B12 levels to drop and this can lead to depression or...

Here's another site listing drugs that that deplete B12:
http://www.umm.edu/altmed/ConsSupplements/Depletions/VitaminB12Cobalamincs.html

From http://www.nutritionfocus.com/nutrition_supplementation/vitamins/vitamin_b12.html :

Absorption of vitamin B12 is impaired by: alcohol consumption, aminosalicylates, cholestyramine,...

You'll find a lot more info on how B12 is affected by various drugs* here:
http://home.caregroup.org/clinical/altmed/interactions/Nutrients/Vitamin_B12.htm


*
Cholestyramine
Cimetidine ...

Hi,
I tried a new internet browser yesterday (Opera 7.5), that lets the user double click on a word to find out more about it through search engines. I tried it on the chemicals listed in the first...

"Drug residues in the environment are of growing interest worldwide. In both human and veterinary medicine a large number of drugs are used. After excretion, these drugs and their metabolites can...

From http://www.spectracell.com/vitamins.html


"Pharmaceutical drugs that can cause a B12 deficiency include aminoglycosides, cephalosporins, chlorotrianisene,...