Should Montek LC Be Continued For A Longer Period?

good morning ,doctor .i had cold ,running nose and bouts of couging suddenly either at night or early morning .i took allegra for along time but not much relief and then my doctor advised montek lc for ten days one tablet after dinner and i am fine now after months .iwish to ask u should i take this medicine for more time my doctor says it is my decision .i am 49 years old and take thyroid medicine ,eltroxin