अस्मिन् परात्मन् ननु पाद्मकल्पे
त्वं इत्थं उत्थापित पद्मयोनिः।
अनन्तभूमा मम रोगराशिं
निरुन्धि वातालयवास विष्णो॥

asmin parātman nanu pādmakalpe
tvaṁ itthaṁ utthāpita padmayoniḥ |
anantabhūmā mama rogarāśiṁ
nirundhi vātālayavāsa viṣṇo ||

Meaning:

O! Viṣṇu, the Supreme Being manifested in the temple of Guruvayoor (a place in Kerala, India) for blessing Your devotees. In this age of pādmakalpa (also known as Śvetavarāha kalpa; kalpa is in reference to the time of Brahmā consisting of innumerable number of human years), You created lotus born Brahmā (originated from the navel of Viṣṇu). You are of incomprehensible greatness. Please do something to get me rid of my ailments.

(Source: Nārāyaṇīyam (canto 8; verse 13)

Other Important Articles:

Mrita Sanjivini Mantra 

Mrityunjaya Mantra

Rakshoghna Mantra