Hydrocodone is binding to pain receptors in the Central Nervous System i.e. mu receptors in the brain. It blocks pain signals and you can get relief from pain. Availability of the doses is Hydrocodone 5-325 mg, Hydrocodone 10-325 mg, Hydrocodone 10-500 mg, Hydrocodone 10-650 mg, Hydrocodone 10-660 mg, Hydrocodone m365, Hydrocodone m367.