اللَّهُمَّ رَبَّ النَّاسِ أَذْهِبِ الْبَأْسَ اشْفِ أَنْتَ الشَّافِي لَا شِفَاءَ إِلَّا شِفَاؤُكَ شِفَاءً لَا يُغَادِرُ سَقَمًا
Transliteration
Allahumma Rabban-nasi adhhibil-ba'sa ishfi antash-shafi la shifa'a illa shifa'uka shifa'an la yughadiru saqama
English meaning
O Allah, Lord of mankind, remove the affliction. Cure, for You are the Curer. There is no cure but Your cure — a cure that leaves no illness.
When is it recited?
Recited over the sick person or by oneself when ill.
Its virtue
The Prophet (PBUH) used to treat the sick with this supplication.
Source
Bukhari, Marda 20, 5742; Muslim, Salam 46, 2191