My son 3 years old. He had viral fever one month before. Since then he was suffering from cough. We taught it viral will go away but no. It's mostly occur whenever he awake from sleep. He continuously cough . It look like wet cough but not really. And when coughing start it's not stopping too easily. So extent of breathless cough at morning after getting up. He has been suffered many times from cold cough viral fever. But this time long.. Which syrup needs to give for such cough. I am currently giving sinarest but no relief . So which cough syrup to take pls help