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Cancer patients at risk for drug interactions
Updated Wed. Apr. 18 2007 7:14 AM ET
Canadian Press
TORONTO -- Many cancer patients are at risk for potentially dangerous drug
interactions because of the number of different medications they take for
multiple conditions, say Canadian researchers, who caution that steps must
be taken to avoid these dicey combinations.
In a study appearing Wednesday in the Journal of the National Cancer
Institute, researchers at Princess Margaret Hospital in Toronto found that
almost 30 per cent of 405 cancer patients studied were taking drugs that
put them at risk for at least one adverse drug interaction.
"Most people who have oncologists also have family doctors and other
specialists,'' Krzyzankowska explained. "They're seeing a cardiologist,
they might be seeing an endocrinologist for their diabetes and they're
getting medications from multiple doctors.''
Some patients keep a list of their medications or bring the doctor a bag
of all their pills, she said. "But sometimes they come and they say: `Oh,
I don't remember. I'm on some blood pressure medication.' But the type of
blood pressure medication matters in terms of this issue.''
With each visit to a different physician, drugs may be added or subtracted
from the list -- "and eventually God knows what cocktail you end up on,''
she said.
"The message to me from this (study) is if you are seeing multiple
providers of care, multiple types of doctors and they're all changing your
medications, you should always be aware of everything you're on, so that
you can tell them: `I'm on this medication and I'm on that medication.'''
"The difficulty is when patients visit multiple drug stores and also see
multiple physicians.''
Kwong advises patients to:
* Always carry an up-to-date list of medications and their dosages,
including over-the-counter and alternative therapies.
* Try to have prescriptions filled by the same pharmacy: electronic
software will alert the druggist of potential drug interactions.
* Make sure to keep different doctors or pharmacists apprised of any
changes in prescriptions.