Have any of you experienced loss of appetite with your cat when s/he was on
Flagyl? I don't know if it is coincidence or if the Flagyl is causing it.
I will be calling the vet on Monday.

Flagyl can cause loss of appetite. I just googled flagyl and side effect and
got the below. Also antibiotics can kill the good bacteria, gut flora, which
makes it tough to digest food. You might want to give your cat some probiotics,
bene-bac sold at Petco..

Common Side Effects

Check with your doctor if any of the following side effects continue or are
bothersome:

Diarrhea
dizziness or lightheadedness
headache
loss of appetite
nausea or vomiting
stomach pain or cramps
Less frequent or rare
Check with your doctor if any of the following side effects continue or are
bothersome:

change in taste sensation
dryness of mouth
unpleasant or sharp metallic taste
Check With Your Doctor
Less common
any vaginal irritation, discharge, or dryness not present before use of this
medicine
clumsiness or unsteadiness
mood or other mental changes
skin rash, hives, redness, or itching
sore throat and fever
stomach and back pain (severe)
For injection form
Pain, tenderness, redness, or swelling over vein in which the medicine is given

Notify Doctor Immediately
Less common
numbness, tingling, pain, or weakness in hands or feet
Rare
convulsions (seizures)

Other Notes
Metronidazole (flagyl) may cause dark urine in some patients. This is temporary
and will go away when you stop taking this medicine.

Other side effects not listed above may also occur in some patients. If you
notice any other effects, check with your doctor. This information is meant
only as a guideline - always consult a physician or pharmacist for complete
information about prescription medications.