Throat feels bone dry even after drinking but mouth not dry and not thirsty. On penicillin atm for one swollen tonsil with pus. Whats causing this?

Throat dryness. in the setting of treatment for tonsillitis--I suspect things will resolve with finishing the penicillin and drinking alot of fluids. need to look for the possibility of oral thrush--ie looking for white lacey area on tongue or inner cheeks. if so --see your doctor for treatment.