Can I Give My Toddler Livolin Just This Once, One Hour After Duolin If The Cough Hasn’t Stopped, ?

Can I give Livolin 2 puff one hour after Duolin (2 puff) to my 3-year-old child if the cough hasn’t stopped, just for this one time? After that, I plan to maintain a 4-hour interval for Livolin and a 6–8-hour interval for Duolin as per doctor prescription