Hello,
Wecome to Healthcare Magic.
Encorate Chrono 500 mg contains 
Sodium Valproate which is used mainly for fits in Epilepsy.
Sodium Valproate has many side effect like 
indigestion, weight gain, blurring of vision, tremor, hair loss , headache, vomiting etc.
Hearing loss is not a side effect of this drug.
You mcan substitute it with other 
levetiracetam drug which has very few side effects.
Brands available in India are levipil and Keppra.
Also, it has no significant drug interactions with others. So, it can be safely used with his other medications.
But please consult your doctor.
Hope this will help you a lot.
Thanks for contacting us.
Take care...