Du’aa’ should be made for the sick person in the manner narrated in the Sunnah: “La ba’s, tuhoor in sha Allaah (No worry, it is a purification, if Allah wills).” Narrated by al-Bukhaari. 

Du’aa’ for healing should be said three times. The Prophet (peace and blessings of Allaah be upon him) visited Sa’d ibn Abi Waqqaas and said: “O Allaah, heal Sa’d,” three times. Narrated by al-Bukhaari (5659) and Muslim (1628). 

The Prophet (peace and blessings of Allaah be upon him) used to place his right hand on the sick person and say: “Adhhib al-ba’s Rabb an-naas, wa’shfi anta al-Shaafi, laa shifaa’a illa shifaa’uka shifaa’an laa yughaadir saqaman (Take away the pain, O Lord of mankind, and grant healing, for You are the Healer, and there is no healing but Your healing that leaves no trace of sickness).” Narrated by Muslim, 2191. 

It was narrated by Ahmad and Abu Dawood (3106) that the Prophet (peace and blessings of Allaah be upon him) said: “Whoever visits a sick person who is not yet dying, and says seven times in his presence: ‘As’alu Allaaha rabb al-‘arsh il-‘azeem an yashfiyaka (I ask Allaah, Lord of the mighty Throne, to heal you), Allaah will heal him of that sickness.” Classed as saheeh by al-Albaani in Saheeh Abi Dawood. 

The visitor should ask him how he is and how he is feeling, etc. That is proven from the Prophet (peace and blessings of Allaah be upon him), as narrated by al-Tirmidhi (983) and classed as hasan by al-Albaani. 

It is also narrated in Saheeh al-Bukhaari that ‘Aa’ishah did that when she visited Abu Bakr and Bilaal (may Allaah be pleased with them both).