Respected doctor, my father is 63 years old and from last 24 month's he is suffering from mnd ( mnd affects his throat) due to that he couldn't speak?

See below: This is exceedingly complicated disorder with a wide variety of end-organ systems affected to variably, fluctuating degrees. Prosthetic speech augmentation devices specifically tailored to his defect offers the most benefit. Try mit research in ent.

Recommend: The sole accepted drug for ALS in the United States is Riluzole, and in your Dad's case might be useful. Also, make sure he does NOT have Lyme disease, hyperthyroidism, or Multi-focal Motor Neuropathy, as these would need a different therapy.