What Are The Side Effects Of Oxetol 300?

hello doc my sis is 30yrs and got married 1 month ago and wat i m intrested in knowing is that she was adviced to take oxetol 300 (salt-oxcarbazepine)from last 2 to 3 years and she take 1 tab. a day will this medicine create a problem for her to conceive coz some day's ago she had complainedof having pain in lowers abdoman and lower back
thanx
plz help