Covid-19 positive treatment. For cough.

Sir, my mother tested covid19 positive on 16/04/2021. After that she had taken the following medicine. 1. Paracetamol for 5 days 2. Azithromycin for 5 days. 3. Ivermectin for 3 days. 4. Doxycycline for 5 days. 5. Vitamin c with zinc(taking till now) 6. Multivitamin 7. Inhaling(using karvol plus) 8. Also doing gargling(lukewarm water with salt) Sir,on 21/04/2021, her spo2 in the pulse oximeter was showing at 89-91 and had cough. We admit her in the hospital on 21/04/2021. But, next day hospital authority told that she is stable and spo2 is 97.Sir, I think here there may be some issue with pulse oximeter. Sir, hospital authority discharged her on 25/04/2021 staying that she is stable now. But, sir my mother had cough with mucous at the time of discharge. Sir, we gave azithromycin 5 days (one tab daily) again with vit-c and mutivita. Sir, on 03/05/2021, on retest she again found positive. Also sir she has cough with mucous till now. please suggest medication for cough.