Can I Continue Giving My Newborn Baby Omnocortil Drops For Cold And Cough If There S No Improvement After 3 Days?

Sir my baby is of 20 days old ..suffering with cold & cough ... Our doctor prescribed omnocortil drops 0.4 ml twice a day ..and I used for 3 days but still the problem remains same ..can I continue dis medicine for few more days ? Pls suggest me sir .. I m nervous