Side Effect Of Ducaine Tablet

Hi, im taking Hifenac Sr tablet with Ducaine tablet aftrnoon, for the reason of nerve pain in my both hand, and also my finger are pain,, how long ca i take this, is thios write tablet im taking? Morning i take Renerve plus Night i take gapatin. tell me some suggestion,

doctors wrote a ducaine medicine for me, but i dont know its used and side effects. pls tell me