My doctor prescribed nitrofurantoin for a bladder infection. One serious side effect listed is perpheral neuropathy and nerve damage in arms and legs.
I checked with the pharmacist who confirmed that the drug literature specifically said this nerve damage was a risk for people with b12 deficiency who take this drug, although the incidence was not recorded.
I'm going to get a different prescription instead, but wanted to pass this along. My doctor wasn't aware, and neither was the pharmacist until I asked her to look it up. We have to double check everything!
Some of the brand names of this drug are: Macrobid, Furadantin, and Macrodantin