Prescription ·Strong evidence ·Reviewed May 2026
A semi-synthetic opioid commonly prescribed in combination with acetaminophen (Vicodin, Norco) for the management of pain severe enough to require opioid treatment and for which alternative treatments are inadequate. Hydrocodone is the most frequently prescribed opioid in the United States and is a Schedule II controlled substance.
The bottom line
Evidence rating strong. Most-documented uses: effective management of moderate to moderately severe pain, combination with acetaminophen provides multimodal analgesia, available in extended-release single-entity formulations. 10 sources indexed (2012–2026), with 4 interaction records on file.
Core mechanism
Acts as a full agonist primarily at mu-opioid receptors in the central nervous system, producing analgesia by altering pain perception at the spinal cord and higher cortical levels. Hydrocodone is metabolized by CYP2D6 to hydromorphone, a more potent active metabolite, and by CYP3A4 to norhydrocodone. It also has antitussive activity via central cough suppression.1,4
Can be taken with or without food; food does not significantly affect absorption; swallow ER formulations whole
Hydrocodone response varies partly with CYP2D6 activity because conversion to hydromorphone differs across metabolizer phenotypes.
Recommendation: Unusually weak pain control or excessive opioid effects should prompt review of overall opioid strategy rather than self-adjustment with supplements.
FDA Black Box Warning: The combination of hydrocodone and alprazolam carries severe risk of fatal respiratory depression. This is among the most commonly co-prescribed dangerous drug combinations in the United States.
Recommendation: Avoid concurrent prescribing. If no alternative exists, use lowest effective doses for the shortest duration. Monitor closely for respiratory depression.
Hydrocodone can cause sedation and respiratory depression, and valerian root may add CNS-depressant effects through GABAergic activity. Direct hydrocodone-valerian clinical studies are limited, but the combination is clinically relevant because opioid harm rises when additional sedating substances are stacked. Risk is higher with higher opioid doses, sleep apnea, lung disease, older age, alcohol, benzodiazepines, gabapentinoids, or other sleep aids.
Recommendation: Do not use valerian root as a sleep aid while taking hydrocodone unless your prescriber knows and agrees. Avoid alcohol and other sedatives, and do not drive after taking both. Seek emergency help for extreme sleepiness, slow or noisy breathing, blue lips, confusion, or inability to wake.
Direct hydrocodone-THC clinical studies are limited, but hydrocodone shares the opioid respiratory-depression and sedation liabilities studied with oxycodone. THC-dominant cannabis can add sedation, impaired attention, and coordination problems, and cannabinoid-opioid studies show clinically meaningful analgesic and behavioral interactions with oxycodone. The combination is most concerning with higher opioid doses, frequent THC use, sleep apnea, lung disease, older age, or other sedatives.
Recommendation: Do not combine THC-dominant cannabis with hydrocodone unless your opioid prescriber knows. Avoid alcohol, benzodiazepines, sleep aids, and driving after using both. Seek emergency help for severe sleepiness, slow breathing, blue lips, confusion, or inability to wake.
Alcohol can dangerously amplify hydrocodone's sedating and breathing-slowing effects. The combination increases the risk of profound sleepiness, impaired coordination, loss of consciousness, respiratory depression, overdose, and death. Risk is higher with higher opioid doses, older age, sleep apnea, lung disease, or any additional sedatives.
Recommendation: Do not drink alcohol while taking hydrocodone. If alcohol was used recently, skip non-urgent opioid dosing and contact your prescriber or pharmacist for individualized guidance. Seek emergency help for extreme sleepiness, slow breathing, blue lips, or inability to wake.
Numbered references. Citations throughout the page link here.
Usmani SA, Hollmann J, Goodin A et al.. Effects of hydrocodone rescheduling on opioid use outcomes: A systematic review. Journal of the American Pharmacists Association : JAPhA. 2021
Ripa SR, McCarberg BH, Munera C et al.. A randomized, 14-day, double-blind study evaluating conversion from hydrocodone/acetaminophen (Vicodin) to buprenorphine transdermal system 10 μg/h or 20 μg/h in patients with osteoarthritis pain. Expert opinion on pharmacotherapy. 2012
Habibi M, Kim PY. Hydrocodone and Acetaminophen. 2026
Bea S, Huybrechts KF, Glynn RJ et al.. Opioid overdose associated with concomitant use of hydrocodone and selective serotonin reuptake inhibitors. BMC medicine. 2025
Bindler RJ, Watson CJW, Lyons AJ et al.. Drug-Drug Interaction Between Orally Administered Hydrocodone-Acetaminophen and Inhalation of Cannabis Smoke: A Case Report. Hospital pharmacy. 2022
Dhillon S. Hydrocodone Bitartrate ER (Hysingla(®) ER): A Review in Chronic Pain. Clinical drug investigation. 2016
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