Flagyl and seizure

Question
I am new to this and I want to first say thanks for being here.

I have a mini long haired dachshund named Casey
[http://www.waugh.ca/torontodachshund/images/photos/finnigan+casey/imag000
5.jpg]. He is the best thing ever but was recently ill.

He had the runs and the vet gave him Flagyl to stop it. Everything worked
out great for the first 24 hrs. It stopped the diarrhoea but he had a
seizure within 24 hrs of taking the medication. We rushed him to the vet
and asked her to look at him. She mentioned that it was very hard for her
to believe that the medication caused it. I immediately took him off of
the medication after one day. It has been 10 days now without a
reoccurrence of a full blown seizure but yesterday he has developed a head
tremor like syndrome.

My research in to the drug is that there are possible side effects if
overdosed or used on puppies or kittens that are seizure like conditions.

I am desperate to find out if the seizures are related to the drugs or if
it was an underlying condition. Has anyone else experienced this? Does it
take days, weeks or months to weed this out of their system?

Any information at all would be greatly appreciated. It breaks my heart
every time I think about this poor little guy and how the meds may have
seriously or permanently damaged him.

Answer
I am very sorry to hear about this.  This is not an area I have much experience in. I can say that dogs do occasionally have seizures without being on medication.  I have had dogs have seizures, and it is scary.  I think most medications are metabolized to below effective levels in days.  They may not even be detectable after a week.  I am not sure where to send you for more info.  Most of the dog forums I hang out in, the others know less than I do and there aren't many people at them.  I don't know much about the other experts here either.  You might try some of them.  

Beware of junk science.  There are kooks around hostile to any medication.  They are short on facts and long on opinions.  Do not count on anybody talking holistic or natural therapies being very objective.