Your situation reminds me of an incident we had with my wife. She is allergic to iodine and avoids betadine and shell fish and wears an iodine warning bracelet. She was taking a medicine that we thought was free of iodine when she became flushed and her face and lips began to swell. She called for help and by that time her tongue had begun to swell. The Doctor recognized the symptoms as an acute allergic reaction and had her drink some antihistamine we had on hand. We found that the problem came from Povidone a drug not normally listed as an active ingredient in many drugs. It appears that povidone and crospovidone are used in many drugs. This is an iodine like drug and can be found in say capsule forms of a drug when it may not be found in the tablet or IV. versions of the same drug. I am terribly sorry to hear of your loss and can only imagine the loss you must feel.
I ran across your story while researching anti-biotic drugs and their several forms to find what my wife can take. It appears that manufacturers have taken to reformulating versions of their drugs to include povidone or crospovidone. These ingredients are not present in all versions of the active drugs which suggests that this additive may be included for some more mundane reason such as to extend the capsules’ shelf life. For whatever reason, this is a practice that can be extremely dangerous to a person allergic to iodine.
Anti-biotics that currently are not toxic to my wife include:
LEVAQUIN oral Solution
DURACEF tablets - not the capsules
BIAXIN XL but no other versions
CIPRO (ciprofloxacin) Oral Suspension only - other forms contain povidone
It should be noted that these are name brand drugs and their
formulation information is easily available. Generic versions are harder to research and must be checked for the addition of povidone or crospovidone.
crospovidone 
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