Frisium tablet dosage? Having fever?

My daughter had seizures when she was 3 years 3 months old for the first time with high fever. And again she had seizures for the 2nd time after 6 months with fever. After that she has no seizures till date, from last 18 months she is good. Just to add, no one in our family has seizures history. At that time doctors suggested to give 1/2 Frisium tablet along with Crosin DS syrup. Also, they suggested to continue this Frisium tablet, whenever she would have fever in the future till the age of 6 years. She got fever 100 Foreign degree yesterday and we are giving paracetamol syrup along with 1/2 Frisium tablet. Could someone please confirm if we need to increase the Frisium tablet dosage, as she is 5 years 3 months old now? Also please let me know if we have any side effects with this tablet? Is this common in children? Upto how many years we can continue this tablet when having fever? Thank you very much for your valuable suggestions.