Saint Panteleimon was a young medical student in the 4th century Roman capital, Nicomedia.  His strongest desire was to help the suffering.  When he encountered Christ in a miraculous way, he fervently devoted himself to his new-found Savior.  And what is more, he found that Christ would answer his prayers and heal man and animal without the need for him to use medical remedies.  His heart replete with compassion, he freely offered healing to all who entreated him--for he freely received from Christ the gift of healing.

We magnify thee, O holy passion-bearer, great martyr and healer Panteleimon,
and we honour thy precious sufferings, which thou didst endure for Christ!

What is an Akathist?  An akathist (Greek, akathistos) is a hymn dedicated to a saint, holy event, or one of the persons of the Holy Trinity. The word akathist itself means "not sitting." (Source:  https://orthodoxwiki.org/Akathist)