أَسْأَلُ اللَّهَ الْعَظِيمَ رَبَّ الْعَرْشِ الْعَظِيمِ أَنْ يَشْفِيَكَ
Transliteration
As'alullahal-'azima Rabbal-'arshil-'azimi an yashfiyak
English meaning
I ask Allah the Supreme, Lord of the Magnificent Throne, to cure you.
When is it recited?
Recited 7 times when visiting the sick.
Its virtue
If said 7 times, the patient will be cured unless their time of death has come.
Source
Abu Dawud, Jana'iz 8, 3106; Tirmidhi, Tibb 32, 2083