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WARNINGDANGER OF DEATH
High doses alone or ordinary doses in combination with other depressants can fatally stop breathing.
Morphine
Morphine
M, Miss Emma, Morpho, Dreamer, White Stuff
Morphine is the principal alkaloid of the opium poppy (Papaver somniferum)citation needed and the prototypical opioid analgesic.1 First isolated by Friedrich Sertürner in 1805,2 it has served as the foundation from which numerous semi-synthetic opioids have been derived. Morphine produces potent analgesia,3 euphoria,3 and sedation,3 and is used clinically for the management of moderate to severe pain.3 Its use carries significant risks of tolerance, physical dependence,4 and abuse.4
Dosage & Duration
Dosage
Doses are population estimates that vary widely between individuals.
Threshold~5 mg
Light5-10 mg
Moderate10-20 mg
Strong20-30 mg
Heavy30+ mg
Bioavailability
40-50%
Duration
Onset10-30 minutes
Come Up20-40 minutes
Peak2-3 hours
Offset1-3 hours
After Effects2-6 hours
Total4-6 hours
Half-life
2-3 hours
Subjective Effects
Legacy content. A statistically backed ontology from Mindstate Design Labs is coming soon.
Effects vary widely by individual, dose, and context.
Physical
Cognitive
Visual
Pharmacology
Pharmacodynamics
Morphine acts primarily as an agonist at the μ-opioid receptor (MOR), which mediates its principal pharmacological effects.citation needed Its intrinsic activity at the MOR is context-dependent; it functions as a full agonist under some assay and tissue conditions while behaving as a partial agonist or antagonist in others. Morphine also activates κ-opioid and δ-opioid receptors, and interacts predominantly with the μ–δ-opioid receptor heteromer. Peripherally, it acts on μ-opioid receptors expressed in the myenteric plexus of the gastrointestinal tract, reducing gut motility.3
Pharmacokinetics
Morphine undergoes extensive first-pass metabolism in the liver, resulting in an oral bioavailability of approximately 40 to 50%.citation needed It is approximately 35% protein bound with a volume of distribution of 5.31 L/kg. Metabolism occurs primarily via glucuronidation by UGT2B7 at the 3 and 6 positions, predominantly in the liver with minor contributions from the brain and kidneys. The major metabolite, morphine-3-glucuronide (approximately 60% of a dose), is pharmacologically inactive, while morphine-6-glucuronide (6 to 10% of a dose) is an active metabolite that retains μ-opioid receptor affinity and is estimated to account for approximately 85% of the observed pharmacological response. The elimination half-life is approximately 2 to 3 hours, and roughly 87% of a dose is excreted renally within 72 hours, with 2 to 10% recovered as unchanged morphine.
Dangerous
Highest riskThese combinations are considered extremely harmful and should always be avoided. Reactions to these drugs taken in combination are highly unpredictable and have a potential to cause death.
Unsafe
AvoidThere is considerable risk of physical harm when taking these combinations, they should be avoided where possible.
Caution
Use cautionThese combinations are not usually physically harmful, but may produce undesirable effects, such as physical discomfort or overstimulation. Extreme use may cause physical health issues. Synergistic effects may be unpredictable. Care should be taken when choosing to use this combination.
Tolerance
Tolerance timelines are rules of thumb, not exact schedules, and vary widely between individuals and use patterns.
Full Tolerance
Tolerance develops rapidly with repeated use, sometimes after only a short period of consumption. This necessitates progressively higher doses to achieve the same effects.
Cross Tolerance
Opioids (μ-opioid receptor agonists)
Baseline Reset
After a period of abstinence, tolerance decreases significantly. Users returning to the substance after abstinence should use substantially lower doses than their pre-abstinence amounts, as their previous typical dose may produce life-threatening effects.
Harm Potential
Addiction & Dependence
Psychological
Extremely HighMorphine is ranked among the most addictive substances known, with studies placing it alongside heroin as the most addictive drug. Psychological dependence is complex and protracted, persisting long after physical withdrawal resolves.citation needed Relapse rates are estimated as high as 98%, and users commonly experience severe depression, anxiety, and overwhelming drug craving during recovery.
Physical
Extremely HighPhysical dependence develops readily with repeated administration, sometimes after only a short period of use. Withdrawal produces the prototypical opioid withdrawal syndrome with symptoms including anxiety, perspiration, muscle aches, severe cramping, diarrhea, vomiting, and intense drug craving progressing through distinct stages over 7-12 days.citation needed While withdrawal is not typically fatal in otherwise healthy individuals, it is intensely uncomfortable.
Toxicity
Gastrointestinal
Constipation is one of the most common side effects, occurring consistently even at typical therapeutic doses due to reduced gut motility.citation needed
Endocrine
Chronic use causes hypogonadism and hormone imbalances in the majority of long-term users of both sexes; studies suggest up to 90% of chronic opioid users experience opioid-induced hypogonadism.
Immune System
Chronic use may suppress immune function and increase susceptibility to infections including pneumonia, tuberculosis, and HIV/AIDS; this immunosuppressive effect is primarily documented in individuals with opioid addiction.citation needed
Central Nervous System
Excess consumption over time can cause changes in synaptic neuroplasticity; these effects are associated with chronic heavy use rather than occasional administration.citation needed
Psychosis Risk
Confusion, nightmares, and hallucinations may occur as side effects, though these are not prominently reported at typical doses.
History & Culture
Ancient and Early Use
The history of morphine is deeply intertwined with humanity's long relationship with the opium poppy. The earliest documented references to opium-based preparations can be traced to the 3rd century BC, when the Greek philosopher Theophrastus recorded their existence.6 Some…
Legality
By Country
Illegal11
AustriaIllegalMorphine is listed as a Suchtgift in I.1.b of Annex I to Austria’s Suchtgiftverordnung. Unauthorized acquisition, possession, production, transport, import, export, offering, supply, or procurement of a Suchtgift is punishable under § 27(1) of the Suchtmittelgesetz by up to one year’s imprisonment or a fine of up to 360 daily rates.
BelgiumIllegalMorphine is listed in Annexe Ia of Belgium’s Royal Decree of 6 September 2017 regulating narcotic and psychotropic substances. Import, export, transport, manufacture, production, possession, sale, supply, dispensing, and acquisition of listed products require prior authorization; lawfully obtained medicines are excepted from the authorization requirement for acquisition and possession.
BrazilIllegalMorphine is listed in Lista A1, Brazil’s list of narcotic substances, in Annex I to Portaria SVS/MS No. 344 of 12 May 1998. The listing places morphine under the special-control regime: its manufacture, import, export, prescription, dispensing, and other handling require compliance with the regulation’s authorization and recordkeeping rules.
FinlandIllegalMorphine is listed in Liite I of the Government Decree on Substances Regarded as Narcotics (543/2008). Under Finland's Narcotics Act, the production, manufacture, import, export, transit, distribution, trade, handling, possession, and use of narcotics are prohibited unless the Act provides otherwise.
IndiaIllegalMorphine is an opium derivative under the Narcotic Drugs and Psychotropic Substances Act, 1985, and is consequently a manufactured drug and narcotic drug under that Act. Section 8 prohibits the production, manufacture, possession, sale, purchase, transport, warehousing, use, consumption, and specified import or export dealings in narcotic drugs except for medical or scientific purposes and as authorized by the Act, rules, or orders. The Act has been in force since 14 November 1985.
IndonesiaIllegalMorphine (Morfina) is listed in the Group II narcotics list in Annex I to Indonesia’s Law No. 35 of 2009 on Narcotics, in force since 12 October 2009. It can be supplied for medical care under the statutory system, including a patient's lawful possession, while unauthorized possession, production, distribution, import, or export is a criminal offence.
NetherlandsIllegalOpiumwet, Lijst I26
Morphine (morfine) is listed in Lijst I of the Netherlands' Opiumwet. Article 2 prohibits importing or exporting, preparing, processing, selling, supplying, transporting, possessing, and manufacturing Lijst I substances; the Act provides regulated exceptions for authorized medical activities and exemptions.
New ZealandIllegalMisuse of Drugs Act 1975, Schedule 1 Part 227
Morphine is listed in Part 2 of Schedule 1 to the Misuse of Drugs Act 1975 as a Class B controlled drug. The Act makes unauthorised possession and dealings, including importation, exportation, manufacture, supply, and sale, offences except as authorised under its statutory framework.
SwedenIllegalMorphine is listed as morfin in Förteckning II of the Swedish Medical Products Agency's narcotics schedules. Unauthorised transfer, manufacture, acquisition, possession, use, and other dealings in narcotics are criminal offences under the Narcotics Criminal Act; authorised medical handling is regulated separately.
ThailandIllegalMorphine is listed as a Category 2 narcotic under the Ministry of Public Health notification specifying Category 2 narcotics. Thailand restricts the production, import, and export of Category 2 narcotics, and requires authorization to sell or possess them.
Prescription3
United StatesPrescription only
MexicoPrescription onlyLey General de Salud, arts. 234 and 24025
Mexico lists morphine, its salts, and its preparations as estupefacients under the General Health Law. The law permits only specified licensed health professionals to prescribe estupefacients, subject to the law, its regulations, and Health Ministry requirements.
United KingdomPrescription onlyMorphine is a Class A controlled drug under the Misuse of Drugs Act 1971 and a Schedule 2 controlled drug under the Misuse of Drugs Regulations 2001. Unauthorised possession is an offence, while medical supply is subject to the Regulations’ prescription and professional controls.
Legal / decriminalized2
AustraliaLegal (regulated)Therapeutic Goods (Poisons Standard—June 2026) Instrument 202610
The federal Poisons Standard lists morphine in Schedule 8. Schedule 8 controlled drugs remain available for use but carry restrictions on manufacture, supply, distribution, possession and use. The Standard sets the scheduling classification, which state and territory legislation implements.
ColombiaLegal (regulated)Morphine is listed as a Schedule I narcotic (Lista Amarilla, Lista I) in Colombia's national controlled-substances annex. It is also classified as a State-monopoly substance, and listed morphine hydrochloride products are medicines of special control under that monopoly. Dispensing of State-monopoly medicines requires a medical prescription under the continuing distribution rules of Resolución 1478 de 2006.
References
Source Pages
Citations
- Morphine. Medical Subject Headings (MeSH) (n.d.). https://www.ncbi.nlm.nih.gov/mesh/680090201
- The isolation of morphine by Serturner. Journal of Anaesthesiology Clinical Pharmacology (2016). https://pmc.ncbi.nlm.nih.gov/articles/PMC5125194/1
- Morphine. StatPearls (n.d.). https://www.ncbi.nlm.nih.gov/books/NBK526115/12345
- MORPHINE SULFATE oral solution, CII — Prescribing Information. DailyMed (NIH) (n.d.). https://dailymed.nlm.nih.gov/dailymed/fda/fdaDrugXsl.cfm?setid=4d425667-006b-446d-832c-63040509ad59&type=display12
- Reddy RG, Aung T, Karavitaki N, & Wass JA. (2010). Opioid-induced hypogonadism. BMJ, 341, c4462. https://doi.org/10.1136/bmj.c446212
- Svend Norn, Poul R Kruse, & Edith Kruse. (2005). [History of opium poppy and morphine]. Dansk Medicinhistorisk Arbog, 33, 171–184. https://pubmed.ncbi.nlm.nih.gov/17152761/12
- Heroin: Killer Drug was Marketed and Sold by Bayer as a Non-Addictive Cough Syrup. Ancient Origins (n.d.). https://www.ancient-origins.net/history-important-events/heroin-marketed-bayer-00112121
- From the Archives: UR's Gates Gave Morphine Its Structure. Campus Times (n.d.). https://www.campustimes.org/2019/04/29/from-the-archives-urs-gates-gave-morphine-structure/1
- Life-work of János Kabay, founder of the Alkaloida pharmaceutical factory. Collection of Hungarikums (n.d.). https://www.hungarikum.hu/en/content/life-work-j%C3%A1nos-kabay-founder-alkaloida-pharmaceutical-factory1
- Therapeutic Goods (Poisons Standard—June 2026) Instrument 2026. legislation.gov.au (n.d.). https://www.legislation.gov.au/F2026L00633/latest/text1
Further Reading
Article Status
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Recent changes8 human edits · latest
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15 August 2026
24 January 2026
Josie Kins · Updated the article · also 1,4-Butanediol, 1B-LSD, 1cP-AL-LAD and 573 more
Josie Kins · Updated the article · also 1,4-Butanediol, 1B-LSD, 1cP-AL-LAD and 573 more
Josie Kins · Updated the article · also 1,4-Butanediol, 1B-LSD, 1cP-AL-LAD and 573 more
Josie Kins · Updated the article · also 1,4-Butanediol, 1B-LSD, 1cP-AL-LAD and 573 more
Josie Kins · Updated the article · also 1,4-Butanediol, 1B-LSD, 1cP-AL-LAD and 573 more
Josie Kins · Updated the article · also 1,4-Butanediol, 1B-LSD, 1cP-AL-LAD and 573 more
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