Managing/medication of ILD. Long term?

Male patient, Age 69 (with unstoppable coughing, even after antibiotics). Diagnosed with ILD in HRCT, and mild restricted pattern in PFT. Given Nintedanib 100 mg BD (with steroids) for 3 months, relieved from frequent cough, but continuous steroids was not good. Moved to other doctor, he gave only nintedanib 100 mg BD, cough syrup next 2-3 months. But, cough was still there. For better result, moved to other doc, gave Pirfenidone 267 mg BD, with steroid sparing agents (Serommune/Azathioprine 50 mg)-4-5 months. Condition improved, very less cough, patient is stable, no other complications, blood reports normal, but PFT still showed mild restricted pattern. Now, Doctor increased dose of pirfenidone to 801 mg BD with Serommune and Azathioprine 50 mg-20 days...still going on. Patient is fine, very less cough. I request your opinions, if this medication fine or Prifenidone overdose ? This will be fine or may have issues in long term ? Appreciate your suggestions on important points to focus