There is no specific medicine in homoeopathy.Ars alb,Ars iod,Kali br,Cup acet,Kali ars,Berb aq ,Sulph or any other remedy cure if it is similimum
If your dad's condition is worsened due to Ars, it is because the case is not that of Ars.
In Kali brom case also like this, only if Kali brom is indicated it will cure

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