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Hydrocodone Facts

Opioid; Depressant; Substituted morphinan; Mu-opioid receptor agonist

Description

Hydrocodone is a semi-synthetic opioid of the morphinan class. It is derived from codeine and sits at roughly the same potency as oral morphine. It activates opioid receptors in the brain and spinal cord, suppressing pain signals and releasing dopamine in the brain's reward circuits.

First synthesized in Germany in 1920, hydrocodone was approved for clinical use in the United States in 1943. It became the most-prescribed drug in the country by 2011, with the U.S. consuming nearly all of the world's supply — a scale of availability that drove the American opioid crisis.[1][2] All hydrocodone products were rescheduled to Schedule II in 2014, imposing the strictest federal prescribing controls.

Subjective effects include pain suppression, euphoria, sedation, anxiety relief, and a warm, heavy bodily calm. The experience is one of physical and emotional quieting — discomfort recedes, mental activity slows, and the body settles into a weighted stillness. Nausea, constipation, cognitive slowing, and respiratory depression are characteristic unwanted effects.

Hydrocodone produces rapid physical dependence and carries high acute toxicity through dose-dependent suppression of breathing. Tolerance to pain relief builds faster than tolerance to respiratory suppression, narrowing the gap between effective and lethal doses — a gap further compressed by alcohol, benzodiazepines, or other depressants. Decades of clinical data provide a robust evidence base, though individual response varies substantially with genetic metabolizer status.[3]

Dose and durationby route · individual sensitivity varies

Oral(mg)
Threshold< 3 mgLight5 – 10 mgCommon10 – 25 mgStrong25 – 40 mgHeavy40+ mg

Starts in 10 – 60 minLasts 4 – 8 hoursAfter-effects 2 – 6 hours

Body and dependence

Acute toxicity
High
Chronic toxicity
High
Physical dependence
Moderate
Psychological dependence
Moderate
Withdrawal
Moderate
Compulsive redosing
Moderate

Tolerance

Builds
Moderate
Fully resets after
10 days
Carries over to
morphine; oxycodone; heroin; fentanyl; methadone; hydromorphone; codeine; tramadol

Effectslikely at a common dose

Perception
Dreaming suppression; +3 possible, including Vestibular distortion, Spatial disorientation, Visual acuity suppression
Body
Bodily heaviness; Body high; Breathing alteration; Constipation; Motor control impairment; Muscle relaxation; Pain suppression; Physical fatigue; Pupil constriction; Respiratory depression; Sedation; Tactile euphoria; +12 possible, including Dizziness, Nausea, Excessive sweating
Thinking
Cognitive euphoria; Cognitive fatigue; +14 possible, including Cognitive impairment, Analysis suppression, Compulsive redosing urge
Feeling
Euphoria; +3 possible, including Empathy suppression
Self
none likely · 5 possible, including Craving, Communication suppression, Social disconnection
Time
none likely · 2 possible, including Temporal disorientation

Who shouldn't take it

Absolute
Severe respiratory depression or acute bronchial asthma; Concurrent or recent MAOI use (within 14 days); Known hypersensitivity to hydrocodone; Paralytic ileus or gastrointestinal obstruction
Relative
Concurrent benzodiazepine or CNS depressant use; Head injury or elevated intracranial pressure; Hepatic impairment; Severe renal impairment; CYP2D6 ultra-rapid metabolizer status; Pregnancy; Biliary tract disease or acute pancreatitis

Combinations62 recorded

Lethal (6)
Benzodiazepines, Barbiturates; GHB, Baclofen; GHB, GBL; Ketamine; Local anesthetics; Tramadol
Dangerous (39)
Antihistamines; Benzodiazepines; Buprenorphine, Kratom; Cannabis, THC; Gabapentin, Pregabalin; MDMA, Amphetamines; Naltrexone; NRIs; Stimulants; THC; 5-HTP, Tryptophan; Alpha-2 adrenergic receptor antagonist; Amphetamines; Anticholinergics; Antipsychotics; Atypical antipsychotics; Buspirone; Caffeine; Cannabis; CBD; Dopamine agonists; DXM; Ephedrine, Pseudoephedrine; Glutamate modulator; and 15 more, see full page
Caution (12)
See full page: psychedex.org/substances/hydrocodone
Not graded (5)
Not listed never means safe.

Seek help immediately if

  • Unresponsive / can't be woken, even to a firm sternal rub
  • Slow, shallow, or stopped breathing
  • Pinpoint pupils
  • Blue/grey lips, fingertips, or skin (cyanosis)
  • Limp body; pale, clammy skin
  • Choking or gurgling sounds ("death rattle")
  • Slow, erratic, or absent pulse

What to do

  1. Try to wake them — shout their name, firm sternal rub
  2. Call emergency services immediately
  3. Administer naloxone if available
  4. Give rescue breaths (or CPR if there is no pulse)
  5. Place them in the recovery position
  6. Stay with them; re-dose naloxone every 2–3 minutes if there is no response
Reversal agent
Naloxone (Narcan) — opioid antagonist. May require repeated doses; its effect can wear off before the opioid does.

With prompt naloxone and rescue breathing, reversal is usually rapid. Because naloxone can wear off before the opioid — especially with long-acting opioids (methadone) or high-potency ones (fentanyl) — a period of monitoring is needed even after the person revives.

988 Suicide & Crisis LifelineFireside Project: 62-FIRESIDE

Version r1 · Not medical advice

References

  1. [1]
    ^Manchikanti L (2012) Opioid Epidemic in the United States — Pain Physician doi:10.36076/ppj.2012/15/es9
  2. [2]
    ^Pergolizzi JV, Breve F, Taylor RM, LeQuang JA (2017) The Aftermath of Hydrocodone Rescheduling: Intentional and Unintended Consequences — International Journal of Anesthesiology & Research doi:10.19070/2332-2780-1600078
  3. [3]
    ^Hosseinnejad K, Yin T, Gaskins JT, Stauble ME, Wu Y, Jannetto P, Langman LL, Jortani SA (2019) Lack of Influence by CYP3A4 and CYP3A5 Genotypes on Pain Relief by Hydrocodone in Postoperative Cesarean Section Pain Management — The Journal of Applied Laboratory Medicine doi:10.1373/jalm.2018.026070
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