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A drug family · Pain and breathing depressants

OpioidsWhat are the types, and why are they linked to the most drug deaths worldwide?

Reviewed by: Dr. Mahmoud El-Sawy Last updated: September 28, 2026 12 min read
The short answer

Opioids are a family of substances extracted from the poppy plant or made to mimic it, such as opium, morphine, codeine, heroin, tramadol, fentanyl and methadone. They bind to opioid receptors in the brain, relieving pain and causing euphoria and drowsiness, but they also depress breathing and cause strong physical dependence. That is why they account for the largest share of drug-related deaths worldwide. Opioid addiction is a treatable disease.

  • Some opioids are important medicines; others are completely prohibited substances.
  • The greatest danger is an overdose that stops breathing, especially when combined with sedatives or alcohol.
  • Effective medications and treatment programs exist for opioid addiction that reduce relapse and death.

What are opioids?

Opioids are any substances that act on the body’s opioid receptors, whether extracted directly from the poppy plant, made from it chemically, or manufactured entirely in laboratories.

The origin of the family is opium, the dried sap of the poppy seed pod, which contains active substances, chiefly morphine and codeine. Heroin was later made from morphine, and pharmaceutical companies then developed fully synthetic painkillers such as tramadol, fentanyl and methadone.

Some writers use the word “opiates” for natural substances only and “opioids” for everything that acts on the same receptors, but the common medical practice today is to use a single name for the whole family, because its members share the same mechanism of action and the most serious harms.

This family includes medicines that are indispensable in hospitals for severe pain, cancer pain and anesthesia, as well as substances that are illegal and have no medical use in Egypt. The real difference between treatment and addiction is not determined by the name of the substance alone; medical supervision and the purpose of use are what make the difference.

How do opioids affect the brain and body?

The body naturally makes opioid-like substances, such as endorphins, that help it bear pain and stress. Opioids mimic these substances but with far greater strength. They bind to opioid receptors in the brain, spinal cord and gut, relieving pain and triggering a large release of dopamine in the reward circuit, so the person feels euphoria and relaxation.

Pain relief and euphoria

Strong pain relief and a feeling of warmth, relaxation and detachment from worries.

Respiratory depression

Opioid receptors in the brainstem control breathing, which is why breathing can slow until it stops.

Tolerance and dependence

With repeated use the brain needs more for the same effect, and withdrawal appears when use stops.

Effects on the body

Severe constipation, pinpoint pupils, drowsiness, nausea, and weakened hormone function with continued use.

The problem is that the body develops tolerance to the euphoria faster than to the respiratory depression. The person who uses them takes more to reach the same effect, while the risk of stopped breathing remains, and it rises sharply after a break in use during which the body loses its tolerance.

What are the types of opioids by source?

Doctors usually classify opioids into three groups according to their source. This classification does not mean that natural ones are less dangerous; the risk depends on the strength of the substance, how it is used, and whether it is mixed with others.

Classification of opioids by source
GroupMeaningExamples from this family
Natural opioidsSubstances found in the poppy plant itselfOpium, morphine, codeine
Semi-synthetic opioidsMade by chemically modifying a natural substanceHeroin, made from morphine
Fully synthetic opioidsMade in laboratories without needing the plantTramadol, tapentadol, fentanyl, methadone

One of the newest members of the family is tapentadol, an opioid painkiller dispensed by prescription for severe pain. Like other opioids, it carries a risk of tolerance, dependence and withdrawal if used without medical supervision.

There is another classification by use: medicines for pain relief such as morphine, tramadol, codeine and medical fentanyl; medicines used to treat addiction itself such as methadone; and substances with no medical use in Egypt such as heroin and raw opium.

Types of opioids

Each substance in the opioid family has a complete guide and separate pages on its harms, symptoms and treatment. Here is a brief profile of each:

Heroin

Heroin
Most searched

Also known as: diacetylmorphine

A semi-synthetic opioid made from morphine, among the fastest drugs to cause addiction and the most closely linked to overdose.

Classification
Semi-synthetic opioid
Medical use
Not used medically in Egypt
Addiction potential
Very high
Withdrawal
Very high

Main risk: respiratory arrest in overdose

Morphine

Morphine

The main active ingredient in opium, used in hospitals to relieve severe pain under close supervision.

Classification
Natural opioid
Medical use
Relief of severe pain in hospitals
Addiction potential
Very high
Withdrawal
Very high

Main risk: respiratory depression

Codeine

Codeine

A relatively weak opioid found in some cough medicines and painkillers, misused in large doses.

Classification
Natural opioid
Medical use
Some cough medicines and painkillers
Addiction potential
Moderate
Withdrawal
Moderate

Main risk: liver damage from the paracetamol (acetaminophen) in some tablets

Fentanyl

Fentanyl

A synthetic opioid about 50 times stronger than heroin; a tiny amount can be enough to stop breathing.

Classification
Synthetic opioid
Medical use
Anesthesia and very severe pain
Addiction potential
Very high
Withdrawal
Very high

Main risk: fatal overdose from a tiny amount

Methadone

Methadone

A long-acting opioid used medically for pain and within treatment programs for opioid addiction.

Classification
Long-acting synthetic opioid
Medical use
Pain treatment and opioid addiction treatment programs
Addiction potential
High
Withdrawal
High

Main risk: it builds up in the body and can disturb heart rhythm

Opium

Opium

The dried latex of the opium poppy capsule, and the origin of the opioid family from which morphine and codeine are extracted.

Classification
Raw natural opioid
Medical use
Not used medically in its raw form
Addiction potential
High
Withdrawal
High

Main risk: respiratory depression, which increases with sedatives

Tapentadol

Tapentadol

A modern synthetic opioid painkiller prescribed for severe pain, which carries a risk of dependence and addiction like other opioids.

Classification
Synthetic opioid (medication)
Medical use
Painkiller for severe acute and chronic pain
Addiction potential
High
Withdrawal
High

Main risk: respiratory depression, especially with sedatives and pregabalin

Nalbuphine

Nalbuphine

Also known as: Nalbuphine, Nubain

An injectable opioid painkiller with a dual action, misused in gyms and able to trigger withdrawal in people who use opioids.

Classification
Mixed-action opioid (medication)
Medical use
Injectable painkiller for severe pain
Addiction potential
Moderate
Withdrawal
Moderate

Main risk: respiratory depression with sedatives, and sudden withdrawal

Pethidine

Pethidine

Also known as: Meperidine, Demerol

An older synthetic opioid painkiller for acute pain, now used less because its toxic breakdown product builds up and causes seizures.

Classification
Synthetic opioid (medication)
Medical use
Severe acute pain and childbirth
Addiction potential
High
Withdrawal
High

Main risk: seizures from its toxic breakdown product, and fatal interactions

Oxycodone

Oxycodone

Also known as: OxyContin, Percocet, hydrocodone

A strong semi-synthetic opioid painkiller linked to the opioid crisis, whose tablets are sometimes counterfeited with fentanyl.

Classification
Semi-synthetic opioid (medication)
Medical use
Moderate to severe pain
Addiction potential
High
Withdrawal
High

Main risk: respiratory depression and counterfeit tablets

Krokodil

Krokodil

Also known as: Desomorphine, crocodile drug

A home-made opioid mixture prepared from codeine, notorious for skin ulcers and bone decay caused by its toxic impurities.

Classification
Home-made opioid
Medical use
Not used medically
Addiction potential
High
Withdrawal
High

Main risk: tissue death, amputation and decay of the jawbone

Buprenorphine

Buprenorphine

Also known as: Subutex, Suboxone

A partial opioid agonist medication for treating opioid addiction that eases withdrawal and cravings, and can be misused outside a prescription.

Classification
Partial opioid agonist (medication)
Medical use
Opioid addiction treatment and pain
Addiction potential
Moderate
Withdrawal
Moderate

Main risk: respiratory depression with sedatives or alcohol

Bisa and Shado

Street heroin

Also known as: Bisa, Shado

Two street names for powders of unknown composition, usually sold as cheap heroin; Shado may also refer to a synthetic cannabis mixture.

Classification
Street heroin
Medical use
Not used medically
Addiction potential
High
Withdrawal
High

Main risk: overdose because the strength is unknown

Comparison of the best-known opioids

Comparison of the members of the opioid family
SubstanceSourceMedical useStatus in EgyptMain risk
OpiumNatural, rawNot used in its raw formProhibitedPotency varies, and it is adulterated with toxic substances
MorphineNormalSevere pain and cancer painA strictly controlled medicationRespiratory depression
CodeineNormalMild to moderate pain and coughBy prescriptionConverted to morphine to a degree that varies between people
HeroinSemi-syntheticNot found in EgyptProhibitedOverdose and infection
TramadolSyntheticModerate to severe painBy prescription and under controlSeizures and serotonin syndrome
FentanylSyntheticAnesthesia and severe painTight controlEnormous potency, and it is mixed in without the user’s knowledge
MethadoneSyntheticPain and opioid addiction treatmentLicensed medical settingAccumulation and delayed respiratory depression

The table shows that the members of the family differ greatly in strength and duration of action: fentanyl is about 50 to 100 times stronger than morphine, while methadone stays in the body much longer than heroin. But all of them share the ability to depress breathing and cause dependence.

Opioids by the numbers: why are they the deadliest?

The World Health Organization estimates that opioids account for the largest share of drug use-related deaths in the world:

60 millionpeople used opioids worldwide in 2021, approximately
80%of about 600,000 drug-related deaths in 2019 were linked to opioids (approximately)
125,000deaths were caused by opioid overdose in 2019, approximately

The organization also notes that fewer than 10% of those who need treatment for opioid dependence receive it, and that mixing with alcohol or sedatives clearly raises the risk of death. In North America, illicitly manufactured fentanyl has become the leading cause of overdose deaths.

Source: the World Health Organization’s fact sheet on opioid overdose.

Why does an opioid painkiller turn into addiction?

Many people with opioid addiction in Egypt did not start with heroin but with a painkiller such as tramadol or a cough medicine containing codeine. Sometimes it began for real pain, to boost work capacity, or on a friend’s advice. With repetition, tolerance develops, then stopping becomes painful, so the person continues to avoid withdrawal rather than to feel euphoria.

  • Using the painkiller for longer than prescribed or without a doctor’s follow-up.
  • Believing the medicine is “safe” simply because it is dispensed by a pharmacy.
  • Using it to ease stress, sadness or exhaustion rather than pain.
  • A personal or family history of addiction, or an untreated mental health condition.

Common myths about opioids

Myths and the truth
The mythThe truth
“Tramadol is an ordinary painkiller that isn’t addictive”Tramadol is an opioid that causes dependence and addiction, and it adds the risk of seizures.
“Opium is natural, so it is less harmful”Opium contains morphine itself, causes addiction and respiratory depression, and may be adulterated with toxic substances.
“Opium treats diabetes and blood pressure”There is no scientific evidence for this, and it causes serious harm and addiction.
“Methadone just swaps one addiction for another”Medication treatment under medical supervision reduces relapse and death and returns the person to their life.
“After a break, I can go back to the same amount”Tolerance falls after a break, and going back to the previous amount is one of the best-known causes of death.
Infographic of myths and facts about opioids: “Tramadol is an ordinary painkiller that isn’t addictive”, “Opium is natural, so it is less harmful”, “Opium treats diabetes and blood pressure”, “Methadone just swaps one addiction for another”, “After a break, I can go back to the same amount”
The best-known myths about opioids and the scientific truth

What dangers do all opioids share?

  • Overdose and stopped breathing, with the risk multiplying when combined with sedatives, alcohol and pregabalin.
  • Physical dependence and painful withdrawal when use stops.
  • Chronic constipation, hormonal disruption, and reduced sexual desire.
  • With injection: viral hepatitis, HIV, and heart and skin infections.
  • Depression and anxiety, and decline in work, study and family relationships.
  • Legal problems with prohibited substances or with possessing medicines without a prescription.

The details vary from one substance to another: tramadol adds the risk of seizures, compound codeine may harm the liver because of the paracetamol it contains, and methadone can disturb the heart rhythm. Read the details in harms of heroin, harms of tramadol and harms of fentanyl.

Is opioid withdrawal dangerous?

Opioid withdrawal is very painful but rarely life-threatening in an otherwise healthy person, unlike alcohol and sedative withdrawal. Its symptoms include anxiety, insomnia, muscle and bone pain, sweating, runny nose, diarrhea, vomiting and cravings. It can become dangerous with severe dehydration, chronic illness or pregnancy.

The greater danger is relapse after stopping, because the body loses its tolerance, so the amount previously used can now stop breathing. The duration of withdrawal depends on how long the substance acts: it starts quickly with heroin, and starts later and lasts longer with methadone. Details are in heroin withdrawal symptoms, tramadol withdrawal and methadone withdrawal.

How is opioid addiction treated?

Opioid addiction is among the types of addiction with scientifically proven treatments. Treatment combines safe withdrawal under medical supervision, medications chosen by the doctor, such as methadone and buprenorphine to reduce cravings and prevent relapse, or naltrexone after withdrawal is complete, and long-term psychological and family therapy.

  1. Step 1
    Assessment

    A comprehensive medical and psychiatric evaluation, identifying the substances used and any co-occurring illnesses.

  2. Step 2
    Safe withdrawal

    Easing withdrawal symptoms with medications chosen by the doctor, while monitoring fluids and sleep.

  3. Step 3
    Rehabilitation

    Cognitive behavioral therapy, group and family sessions, and treatment of any accompanying depression or anxiety.

  4. Step 4
    Relapse prevention

    A plan for triggers, regular follow-up, and educating the family about the signs of overdose.

Infographic: How is opioid addiction treated? Assessment, then safe withdrawal, then rehabilitation, then relapse prevention
How is opioid addiction treated?

Read more in heroin addiction treatment, tramadol addiction treatment and opium addiction treatment.

Withdrawal and treatment for the whole opioid family

Two guides that bring together what all opioids share when use stops and in treatment:

Do all opioids show up on a drug test?

Not all of them show up on the same test. The traditional rapid opioid test is designed mainly to detect morphine and its metabolites, so it picks up heroin, morphine, codeine and opium, while tramadol, fentanyl and methadone usually need their own specific tests. A positive rapid test needs laboratory confirmation, and detection times are approximate and vary by laboratory.

Details are in heroin testing and tramadol testing.

How can the family deal with the risk of opioids?

  1. Keep opioid painkillers locked away, and dispose of any leftovers after treatment ends, in coordination with the pharmacist.
  2. Watch for signs: unexplained drowsiness, pinpoint pupils, constant constipation, and missing medicines or money.
  3. Talk calmly and without accusation, focusing on your concern for their health rather than on punishment.
  4. Learn the signs of overdose, and know that calling an ambulance immediately can save a life.
  5. Seek specialist advice early; treatment works best the sooner it starts.

This is general educational material and not personal legal or medical advice.

Signs of opioid overdose: call ambulance (123) immediately

  • Very small, pinpoint pupils
  • Loss of consciousness, or no response to calling out or shaking
  • Very slow, weak or stopped breathing, or snoring and gurgling sounds
  • Blue lips and fingernails and cold skin
  • Seizures, especially with tramadol
  • Slow or weak pulse

Call ambulance (123) immediately, place the person on their side in the recovery position, and stay with them until help arrives. Emergency departments have an antidote called naloxone that temporarily reverses the effects of opioids, but it can wear off before the substance does, so the person must stay under observation in the hospital. Do not use cold water, coffee or any home remedy.

Call the ambulance 123
Frequently asked questions

Frequently asked questions about opioids

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What is the difference between opium and opioids?

Opium is a single substance, the dried sap of the poppy plant, while opioids are the whole family, including opium and its derivatives such as morphine and heroin, and synthetic substances such as tramadol and fentanyl.

What is the strongest type of opioid?

Fentanyl is one of the strongest known opioids, about 50 to 100 times more potent than morphine, which is why a tiny amount can be enough to stop breathing.

Are all opioids illegal drugs?

No. Some are important medicines dispensed by prescription and under control, such as morphine, tramadol and codeine, while others are completely prohibited in Egypt, such as heroin and raw opium.

Why do opioids cause death?

Because they depress the breathing centers in the brainstem, so breathing slows until it stops. The risk rises when they are mixed with sedatives or alcohol, or after a break in use.

Are opioids stimulants or sedatives?

Opioids are nervous system depressants. Some people who use them may feel energetic or uninhibited at first, but their main effects are pain relief, drowsiness and respiratory depression.

Can you become addicted to prescribed opioid painkillers?

Yes, especially with long-term use or increasing the amount without consulting a doctor. But use under medical supervision and for a set period greatly reduces this risk.

What is the difference between physical dependence and addiction to opioids?

Physical dependence is the body’s adaptation, with withdrawal appearing when use stops, and it can occur with medical use. Addiction is compulsive continued use despite harm and loss of control.

Does opioid withdrawal cause death?

Rarely in an otherwise healthy person, but it is very painful and can cause dangerous dehydration. The greater danger is returning to use after tolerance has been lost.

What medications are used to treat opioid addiction?

Among the best known are methadone, buprenorphine and naltrexone. The doctor chooses the right one for each patient, along with psychological and family therapy.

Is there treatment for opioid addiction in Egypt?

Yes. Specialized treatment programs include safe withdrawal, psychological rehabilitation and relapse prevention, and treatment works best the sooner it starts.

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