Hello B S Sarma
Your history suggests that you have been diagnosed recently with Tuberculosis
and started on Anti Tubercular Treatment with AKT
-4 and R-cin. Zedex and Reswas are both cough suppressant and your history suggests that you find no much improvement with your cough symptom. Persistent of cough in patients like you could be
1) due to persistent disease which may take sometime to get under control
2) development of secondary complication like development cavity, secondary infections, obstruction.
3) could allergic cough
So as you have persistent symptoms it advisable to consult your treating physician to get evaluated appropriately preferably a Pulmnologist (Lung Specialist) as early as possible.
Wish u a Speedy Recovery and Healthy Life