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Greetings,Thank you for your question. I am Dr. Su S. and I will try my best to help you.I am sorry for his symptoms.
The symptoms of runny nose and dry cough are mostly due to viral illness.
Usually viral illness recovers by its own with adequate rest.
Triaminic DayTime Cold & Cough can be given.
Give him more fluid.
Sometimes it can be due to bacterial illness where antibiotic can be needed.
But if the symptoms continue, take him to doctor for examination and evaluation.
I hope this information will be helpful.If you have any query, please feel free to ask.If you are happy with my answer please click on the Excellent/Good rating. Wish his healthy life.Regards.