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Psychedex
Facts label

Morphine Facts

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

Dose and durationby route · individual sensitivity varies

Oral(mg)
Threshold< 5 mgLight5 – 15 mgCommon15 – 30 mgStrong30 – 60 mgHeavy60+ mg

Starts in 10 – 30 minLasts 4 – 6 hoursAfter-effects 2 – 4 hours

Also recorded: Intravenous · Intramuscular. See full page: psychedex.org/substances/morphine

Body and dependence

Acute toxicity
Critical
Chronic toxicity
High
Physical dependence
High
Psychological dependence
High
Withdrawal
Severe · medical supervision
Compulsive redosing
High

Tolerance

Builds
Rapid
Fully resets after
14 days
Carries over to
heroin; oxycodone; hydromorphone; fentanyl; methadone; hydrocodone; codeine; buprenorphine

Effectslikely at a common dose

Perception
none likely · 6 possible, including Spatial disorientation, Visual acuity suppression, Visual haze / noise
Body
Sedation; Tactile euphoria; Constipation; Respiratory depression; Spontaneous body sensations; Pain suppression; Pupil constriction; Bodily heaviness; Body high; +16 possible, including Nausea, Dizziness, Motor control impairment
Thinking
Cognitive euphoria; Thought deceleration; Cognitive impairment; +11 possible, including Compulsive redosing urge, Information processing suppression, Analysis suppression
Feeling
Anxiety suppression; Euphoria; +4 possible, including Anhedonia, Depression
Self
Craving; +4 possible, including Communication suppression, Social disconnection
Time
none likely · 1 possible, including Temporal disorientation

Who shouldn't take it

Absolute
Severe respiratory depression; Paralytic ileus; Morphine hypersensitivity
Relative
Raised intracranial pressure; Hepatic impairment; Renal insufficiency; Pregnancy and breastfeeding; Concurrent MAOI therapy

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/morphine
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

psychedex.org/substances/morphine · Version r1 · Not medical adviceValues as of
On the printout