It is a narcotic and may cause withdrawal symptoms if it is stopped too abruptly. Although Norco withdrawal can be quite unpleasant and uncomfortable, you can be assured that it is not life threatening. Norco withdrawal is possible in people who abuse Norco and in people who take Norco for a legitimate medical use.
Definition of melanin for English Language Learners. : a dark brown or black substance that is a natural part of people's skin, hair, and eyes.
Melanotic is a word but it pertains to melanin or skin pigment. Melenic pertains to melena or black stool. Note the As and Es. Many doctors use this term incorrectly, and many MTs too! I always change it.