Hysingla ER can slow or stop your breathing. Never use hydrocodone in larger amounts, or for longer than prescribed. Do not crush, break, or open an extended-release Hysingla ER tablet. Swallow it whole to avoid exposure to a potentially fatal dose. Hydrocodone may be habit-forming, even at regular doses. Never share this medicine with another person, especially someone with a history of drug abuse or addiction. Keep the medication in a place where others cannot get to it.