clogged nose

My pedia recommend citirizine and salinase drop for my 1mos and 15days baby. Okay lang po ba painumin na agad ng citirizine? May clogged nose po si baby every night. And ung salinase drop po ba ay hindi talaga dinadrop kung kelan clogged ang nose ni baby? May time lang po kasi na binigay kung kelan idodrop kahit d clogged ang nose