Hello all. I have a situation I'd like to know a bit more about.
Recently my cat, who has lived with my parents for the past 13 years
(because I lived first in a small apartment and then abroad) recently
stopped eating. My dad brought her to the vets and she was diagnosed
with toxoplasmosis. She seemed to be deteriorating even with the drugs
they gave him, namely interferon and clindamycin hyrochloride. Then she
started to get better, started eating again and we thought all was ok.

One day my dad was unable to administer the medicine in the morning so
he decided to wait until that evening. He had already mixed the two
medicines in the eyedropper and simply left it out on the counter top.
The vet had told him that mixing the two was no problem, which made my
dad's life easier -- getting drops down a cat's throat once is hard,
twice is just asking for scratches.

The problem is one of the drugs -- interferon -- had to be
refridgerated, and always was, except that particular day, when he left
it out on the counter all day in the eyedropper.

That evening when he gave her the medicine she went nuts, started
jumping up in the air and running in circles, panting wildly and
finally collapsed in the corner breathing heavily and with both front
paws twitching. She died during the night.

Now my dad feels really guilty and thinks he killed her. I don't know
what happened. She seemed to be getting better, and from everything I
read toxoplasmosis doesn't usually kill the cat. But she was almost 14
years old.

My question is, is it possible that leaving the interferon out all day
caused it to become toxic and killed my poor kitty? Even if it turns
out that people tell me "yes" I won't say anything to my dad, it would
just kill him and he already feels bad enough. But I would like to
know.

Thanks in advance for any information.
Bob