Hi, I had gone through your question and understand your concerns. Omnacortil is usually given as a rescue medicine for allergies ,usual duration being 5-7 days . If cough is being considered due to allergy or reactive airway disease you can discuss inhalation steroids which are safe for long term use. If child is not at all responding to omnacortil , diagnosis other than allergy needs to be considered. Hope this answers your question. If you have additional questions then please do not hesitate in writing to us. Take care. • DISCLAIMER: - All the information provided here is for information purpose only , it is not a substitute for the advice of a physician after physical examination , it is not intended to replace your relationship with your doctor. This information in no way establishes a doctor-patient relationship. Before acting anything based on this information do consult your doctor. I recommend that online users seek the advice of a physician who can perform an in-person physical examination