My father is 60 he old. He is having cough since 5 days. Some times due to heavy cough while working he would have breathlessness. I recently visited father and he looks weak. He has taken medicine for cough and sometimes difficult to swallow hard food. He has taken cough syrup and antibiotics tablets. He has taken covid test today and results are yet to come after 4 days. We live in small town and not understanding how to deal if severe as Bangalore also got lockdown. Please suggest me how to proceed if positive results come. What best medication we can use.