Is Maxtra Oral Drops Safe For Recurring Cough?

Respected doctor, My baby is 9 months olds . She had Maxtra 15ml Oral drops [Phenylephrine and Chlorpheniramine Maleate oral drops] prescribed by pedratic doctor. Afer taking this she was okay. Now after two weeks again same thing [cold ] mild cough back. Yesterday night she was crying . Now a days she is putting everything in mouth. Though we are care about hygenic. In this case can I repeat Maxtra 15ml Oral drops [Phenylephrine and Chlorpheniramine Maleate oral drops] ? Please advice. Ali