Thanks for the query
It looks like your mother is suffering from diarrhea, probably secondary to antibiotics used for the uveitis
400 is a good drug and it is usually tolerated well.
I suggest you to use Tab Metrogyl
instead of Sibofix if it is causing problems in her.
I also suggest a pro biotic like VSL-3 or Sporocal for 7 days. Please visit your physician for a prescription.
I also suggest the following
1. Avoid spicy food
2. Avoid milk and milk products
3. Avoid de hydration by taking plenty of fluids
I hope I was of help, if you have any further queries please get back to me
I wish your mother good health and a speedy recovery