Is There Any Side Effects Of Zanocin Oz And Metrogyl?

my father who is 64 yrs of age diabetic for 16 yrs having oral medicines has been treated with zanocin oz and metrogyl got relief fof sometime and then went through sigmodoscopy test is normal but again had loose motion so being treated wiyhrifagut 400 and cvsl-3 is a bit better now but again had loose motion today once. what can be done. kundly help