Exorcism
In Catholic Christianity, exorcisms are performed in the name of Jesus Christ. A distinction is made between a formal exorcism, which can only be conducted by a priest during a baptism or with the permission of a bishop, and "prayers of deliverance" which can be said by anyone.
The Catholic rite for a formal exorcism, called a "Major Exorcism", is given in Section 11 of the Rituale Romanum. The Ritual lists guidelines for conducting an exorcism, and for determining when a formal exorcism is required. Priests are instructed to carefully determine that the nature of the affliction is not actually a psychological or physical illness before proceeding.
Exorcism in Islam
Exorcism in Islam is called "ruqya" ( ), and is thought to repair damage believed caused by jinn possession witchcraft ("shir") or the evil eye. Exorcisms today are part of a wider body of contemporary Islamic alternative medicine called "al-Tibb al-Nabawi" (Medicine of the Prophet).