What is the ruling on the prayer of a sick person who makes involuntary movements and gestures during the prayer?

Question:
He says: Honorable Shaykh, may Allah grant you success. This questioner says: I am suffering from a strange illness, and I use a treatment for this illness. When this illness is gone, I am sound in my actions, and I maintain my prayer, and that is while using the treatment. If I stop the treatment, my actions become reprehensible, and I say strange words, but even so I maintain the prayer. His question is: Is there a sin on me for those actions while stopping the treatment, and should I continue using it or stop it? And I ask your honor to supplicate for my recovery?

Answer:
We ask Allah for your recovery and well-being, and praise be to Allah that you maintain your prayer in both states. What comes from you in the state of stopping the treatment, you are excused for it, if Allah wills, so there is no blame on you for that. The treatment is not obligatory; taking the treatment is permissible and not obligatory. So if you stop it, you are leaving a permissible thing. Is there no blame on you for that? Yes.