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MM mantra 15

he lokāḥ śṛṇuta prasūti-maraṇa-vyādheś cikitsām imāṁ
yoga-jñāḥ samudāharanti munayo yāṁ yājñavalkyādayaḥ
antar-jyotir ameyam ekam amṛtaṁ kṛṣṇākhyam āpīyatāṁ
tat pītaṁ paramauṣadhaṁ vitanute nirvāṇam ātyantikam
Synonyms: 
he lokāḥ — O people of the world; śṛṇuta — just hear; prasūti — of birth; maraṇa — and death; vyādheḥ — for the disease; cikitsām — about the treatment; imām — this; yoga-jñāḥ — experts in knowledge of mystic yoga; samudāharanti — recommend; munayaḥ — sagacious; yām — which; yājñavalkya-ādayaḥ — such as Yājñavalkya; antaḥ — inner; jyotiḥ — light; ameyam — immeasurable; ekam — only; amṛtam — immortal; kṛṣṇa-ākhyam — the name of Kṛṣṇa; āpīyatām — just drink; tat — it; pītam — being drunk; parama — supreme; auṣadham — medicine; vitanute — bestows; nirvāṇam — liberation; ātyantikam — absolute.
Translation: 
O people, please hear of this treatment for the disease of birth and death! It is the name of Kṛṣṇa. Recommended by Yājñavalkya and other expert yogīs steeped in wisdom, this boundless, eternal inner light is the best medicine, for when drunk it bestows complete and final liberation. Just drink it!
Purport: 

Devotees are always pleased to hear bona fide verses proclaiming the glories of the Lord's holy names. We like to be reminded and encouraged to always chant and hear the holy names with great attention and devotion.

As a pure devotee of Lord Kṛṣṇa, King Kulaśekhara naturally worships the holy names of the Lord. Here he compares them to a medicine for curing the disease of saṁsāra. Of all dreaded maladies, saṁsāra is the worst, because it includes all other diseases. As long as we are bound to take birth in the material world, we must inevitably expose ourselves to cancers, heart attacks, AIDS, and so on. All cures within this world are temporary because even if we are cured of one disease, we will eventually contract another, either in the present life or a future one. As with our attempts for happiness, our attempts for health must fail sooner or later.

In previous ages in India, a criminal would sometimes be strapped to a chair and immersed in water almost to the point of drowning. Upon being brought up, he felt great relief—only to be plunged under again by his torturers. Similarly, the times when we are pain-free and happy are like the few seconds of relief the prisoner feels when he is brought up from under water. The basic principle of material life is suffering.

Therefore we should be very eager to receive the medicine that will cure all our diseases. The word nirvāṇa in this verse refers to the permanent cessation of saṁsāra and its attendant miseries. Nirvāṇa has become famous from the teachings of Buddhism, but the voidistic liberation the Buddhists teach is unnatural for the living entity, and thus it is temporary. We can find factual, permanent release from pain only in the kind of liberation King Kulaśekhara refers to here: the liberation of a devotee engaged in eternal service to the Supreme Personality of Godhead. When through the process of devotional service we become free of all material desires and attain pure love of God, we will be transferred to the Vaikuṇṭha realm, where there are no anxieties or suffering.

At the beginning of the Tenth Canto of the Śrīmad-Bhāgavatam (10.1.4), King Parīkṣit also uses the word auṣadhi ("medicine") to refer to the chanting and hearing of kṛṣṇa-kathā, or words about Kṛṣṇa: "Descriptions of the Lord are the right medicine for the conditioned soul undergoing repeated birth and death." Such descriptions, of course, include the chanting and hearing of the Lord's holy name.

As with any bona fide medicine, one should take the nectarean potion of the holy name under the guidance of experts, in this case sages and the spiritual master. The Supreme Lord's names vary with His different pastimes and relationships with His pure devotees. He appeared as the son of Mother Yaśodā and also as the son of Mother Devakī, and therefore He is named Devakī-nandana and Yaśodā-nandana. One should receive the Lord's authorized names from the spiritual master in disciplic succession.

The śāstras recommend which names we should chant. For example, the Kali-santaraṇa Upaniṣad recommends the Hare Kṛṣṇa mahā-mantra: Hare Kṛṣṇa, Hare Kṛṣṇa, Kṛṣṇa Kṛṣṇa, Hare Hare/ Hare Rāma, Hare Rāma, Rāma Rāma, Hare Hare. We don't have to search for some name or manufacture one. Rather, we must follow the saintly persons and the śāstras in chanting the Lord's holy names, as Śrīla Prabhupāda recommends in his Śrīmad-Bhāgavatam (8.1.13, purport).