I had a couple of questions about this, so maybe I should chime in. 1) Do you carry anything on your person that identifies the fact that you require meds and multi-vitamin? 2) do you need a full multi or only a few specific vitamins? You might be able to get a smaller pill that satisfies your needs if it doesn't have a bunch of compounds you don't need. I'm assuming these were prescribed by a doctor since some vitamins are contraindicated with various meds. At the very least I would run what you are taking by your pharmacist for any interaction troubles.
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Experience is a hard teacher because she gives the test first, the lesson afterwards.