Table of ContentsSelect to explore sections
What happens to the body after an overdose?
Surviving a drug overdose can be a life-changing experience. Even after someone regains consciousness, begins breathing normally, or is released from the hospital, the body may still be recovering from serious medical complications.
A drug overdose can affect several organs, including the brain, lungs, heart, kidneys, and muscles. Depending on the substances involved, the severity of the overdose, and how quickly medical treatment begins, some effects may resolve while others require ongoing care.
New research published by the Centers for Disease Control and Prevention (CDC) on October 22, 2026, highlights an important concern: serious medical complications can occur alongside nonfatal drug overdoses, even when someone survives the initial emergency.
For individuals and families in Nashville, La Vergne, Murfreesboro, and throughout Middle Tennessee, understanding what happens after an overdose can help identify warning signs, encourage appropriate medical follow-up, and support informed decisions about addiction treatment.
What Happens to Your Body During a Drug Overdose?
A drug overdose occurs when exposure to a substance causes potentially harmful or life-threatening effects. This can involve illicit drugs, prescription medications, or combinations of substances.
The effects depend on what was taken.
Opioids such as fentanyl, heroin, and certain prescription pain medications can suppress breathing and reduce oxygen delivery to vital organs.
Stimulants such as cocaine and methamphetamine can increase heart rate, blood pressure, and body temperature, sometimes causing seizures, dangerous heart rhythms, or other medical emergencies.
Alcohol and benzodiazepines can cause profound sedation, impaired consciousness, and dangerous breathing problems, particularly when combined with other depressants.
In severe cases, these effects may interfere with circulation, oxygen delivery, temperature regulation, and normal organ function.
Even when emergency treatment successfully reverses an immediate overdose, medical complications may continue developing during the following hours or days.
What Does New CDC Research Reveal About Overdose Complications?
On October 22, 2026, the CDC published research examining acute kidney injury among patients hospitalized for overdoses involving opioids, cocaine, and psychostimulants.
The researchers analyzed 1,297,847 overdose-involved hospitalizations in the United States between 2016 and 2025.
Their findings included:
A severe inpatient course included complications such as acute dialysis, respiratory compromise, shock or low blood pressure, or death during hospitalization.
These findings do not mean that approximately one-third of all overdoses cause kidney failure. The study involved selected hospitalized patients, and acute kidney injury is not the same as permanent kidney failure.
The research does, however, demonstrate why evaluating organ function and arranging appropriate follow-up care are important parts of overdose recovery.
Source: CDC, Acute Kidney Injury Among Patients with Drug Overdose–Involved Hospitalizations, United States, 2016–2025, October 22, 2026.
How Does a Drug Overdose Affect the Brain, Heart, Lungs, and Kidneys?
The medical effects of an overdose can extend beyond the symptoms that first prompted emergency treatment.
Different organs may be affected through oxygen deprivation, changes in circulation, drug toxicity, overheating, seizures, and muscle injury.
Brain: Oxygen Deprivation and Neurological Complications
The brain requires a continuous supply of oxygen to function.
During an opioid overdose, dangerously slow or stopped breathing can reduce oxygen delivery to brain tissue.
Prolonged oxygen deprivation may contribute to hypoxic brain injury, which can affect memory, concentration, movement, and other neurological functions.
Some survivors experience confusion or difficulty concentrating during recovery.
Severe overdoses may also involve seizures or other neurological complications.
Not every person who survives an overdose experiences brain injury. The risk depends on the duration and severity of oxygen deprivation and other medical circumstances.
Heart: Irregular Heart Rhythms and Cardiovascular Stress
Certain substances place significant strain on the cardiovascular system.
Cocaine and methamphetamine can increase heart rate and blood pressure, constrict blood vessels, and contribute to dangerous changes in heart rhythm.
Severe intoxication may increase the risk of heart attack, stroke, or cardiovascular collapse.
Other substances can cause dangerously low blood pressure or interfere with the heart’s electrical activity.
Someone experiencing chest pain, fainting, severe palpitations, or difficulty breathing after an overdose requires emergency medical evaluation.
Lungs: Respiratory Depression and Breathing Problems
Respiratory depression is one of the most dangerous effects of an opioid overdose.
When breathing becomes too slow or stops, oxygen levels can fall throughout the body.
Some individuals experience aspiration, which occurs when vomit or other material enters the lungs.
Others may develop pulmonary edema or respiratory complications requiring oxygen support or mechanical ventilation.
Even when naloxone successfully reverses opioid-related breathing suppression, additional medical monitoring may be necessary.
Naloxone can wear off before the effects of some opioids have fully resolved, creating a risk of recurrent respiratory depression.
Kidneys: Acute Kidney Injury
The kidneys filter waste products, regulate fluid levels, and help maintain normal electrolyte balance.
Overdose complications such as low blood pressure, severe dehydration, oxygen deprivation, and muscle breakdown can interfere with these functions.
Acute kidney injury occurs when kidney function declines rapidly.
Possible signs include reduced urine output, swelling, weakness, nausea, or changes in mental status.
However, kidney injury may develop without obvious symptoms and may only be identified through laboratory testing.
Severe cases can require dialysis, while other patients recover with appropriate medical treatment.
Muscles: Rhabdomyolysis
Rhabdomyolysis is a condition involving the breakdown of damaged muscle tissue.
It can occur when someone remains unconscious in one position for an extended period, experiences seizures, becomes severely overheated, or develops significant muscle injury.
Damaged muscles release substances into the bloodstream that can contribute to kidney injury.
Symptoms may include muscle pain, weakness, swelling, and dark-colored urine, although the classic combination of symptoms is not always present.
Prompt medical treatment is important because severe rhabdomyolysis can cause dangerous electrolyte abnormalities and kidney complications.
What Are Common Symptoms After Surviving a Drug Overdose?
Symptoms after an overdose vary depending on the substances involved and whether medical complications developed.
Some people recover relatively quickly after receiving emergency treatment. Others require hospitalization, further testing, or ongoing medical care.
Possible symptoms during recovery include:
- Unusual fatigue or physical weakness
- Headaches or difficulty concentrating
- Nausea, vomiting, or reduced appetite
- Muscle soreness or weakness
- Dizziness or changes in balance
- Sleep disturbances
- Anxiety or emotional distress
- Breathing discomfort
- Changes in urination
- Confusion or memory difficulties
These symptoms are not specific to overdose complications and should not be used to diagnose organ damage.
Seek emergency medical care for chest pain, difficulty breathing, seizures, loss of consciousness, severe confusion, or other potentially life-threatening symptoms.
A person who has experienced a suspected overdose needs prompt emergency evaluation, even if they initially appear to improve.
What Happens in the Hospital After a Drug Overdose?
Emergency departments focus first on stabilizing breathing, circulation, consciousness, and other immediate threats to life.
The specific treatments depend on the suspected substances, symptoms, medical history, and examination findings.
Emergency Stabilization
Medical professionals assess breathing, oxygen levels, heart rate, blood pressure, and consciousness.
If opioid toxicity is suspected, naloxone may be administered to reverse opioid-related respiratory depression.
Other emergency interventions may include oxygen, airway support, intravenous medications, or treatment for seizures and abnormal heart rhythms.
Testing for Medical Complications
Depending on the clinical presentation, healthcare professionals may order blood tests, urine tests, an electrocardiogram, imaging, or other assessments.
Testing may evaluate kidney function, electrolytes, muscle injury, heart-related complications, or other concerns.
Not every patient requires the same tests.
Routine toxicology screens also have limitations and may not identify every emerging synthetic opioid or other unfamiliar substance.
Monitoring and Treatment
Some people require observation because symptoms may return after an initial improvement.
Others need hospitalization for complications such as respiratory failure, kidney injury, severe dehydration, heart problems, or prolonged changes in consciousness.
Treatment is individualized based on the person’s condition.
Discharge and Follow-Up Planning
Before discharge, clinicians may provide instructions concerning symptoms that require urgent care, medications, laboratory testing, and follow-up appointments.
For people with an opioid overdose, the medical team may also discuss naloxone access and medications for opioid use disorder.
An appropriate discharge plan should address both immediate medical risks and any continuing substance-use needs.
How Long Does the Body Take to Recover After an Overdose?
There is no universal recovery timeline.
Some people improve over several hours after receiving emergency treatment, while others experience complications that require days, weeks, or longer to address.
Recovery depends on the type of substance, severity of intoxication, duration of impaired breathing or circulation, existing health conditions, and whether organ injury occurred.
For example, someone who experienced temporary sedation without significant complications may recover differently from a person who developed acute kidney injury or prolonged oxygen deprivation.
Physical recovery may also occur alongside emotional challenges.
Some survivors experience fear, anxiety, guilt, depression, or concern about another overdose.
These feelings deserve attention, particularly when substance use has become difficult to control.
Follow-up medical appointments are important when clinicians have identified organ injury or recommended further testing.
Why Is Another Overdose a Concern After Surviving the First?
A previous overdose is an important warning sign for future overdose risk, particularly when substance use continues without effective treatment.
Several factors may increase the likelihood of another emergency.
Reduced Opioid Tolerance
After a period of reduced or stopped opioid use, the body’s tolerance may decline.
Returning to a previously tolerated amount can increase the risk of fatal respiratory depression.
This is one reason continued treatment and overdose-prevention planning are important following detoxification or hospitalization.
Unpredictable Drug Composition
Counterfeit pills and illicitly manufactured drugs may contain unexpected substances.
A person may not know whether a product contains fentanyl, another synthetic opioid, benzodiazepines, or multiple compounds.
Polysubstance Use
Combining opioids with alcohol, benzodiazepines, or other sedating drugs can increase overdose risk.
Using stimulants and opioids together can also create serious medical complications.
Untreated Substance Use Disorder
Cravings, withdrawal symptoms, stress, trauma, and co-occurring mental health concerns may contribute to continued use.
Treatment that addresses these underlying challenges can help reduce future risks.
Do You Need Medical Detox After Surviving an Overdose?
Not everyone who survives an overdose requires medical detox.
An overdose is an acute medical event. Detoxification is the process of managing withdrawal when physical dependence has developed.
A person can experience an overdose without having a substance use disorder, and someone with a substance use disorder may need ongoing treatment beyond detox.
Medical detox may be appropriate when a person experiences significant withdrawal symptoms, has difficulty stopping substance use, is dependent on alcohol or benzodiazepines, or requires medically supported stabilization.
The appropriate level of care depends on an individualized assessment.
For people experiencing dependence on opioids, alcohol, benzodiazepines, or other substances, drug detox in Tennessee can provide supervised withdrawal management and planning for continued care.
What Medical Detox Can Help Address
Medical detox may involve:
- Assessment: Reviewing substance-use history, previous overdoses, withdrawal symptoms, medications, and medical or mental health conditions.
- Monitoring: Observing withdrawal symptoms, vital signs, hydration, and overall stability.
- Symptom management: Providing appropriate medical support and medications when clinically indicated.
- Continuing-care planning: Coordinating addiction treatment, medication for opioid use disorder when appropriate, counseling, or other recovery services.
Medical detox is not a substitute for emergency treatment of active overdose complications or ongoing specialist care for organ damage.
For opioid use disorder, evidence-based medications such as buprenorphine or methadone may be appropriate and should be considered as part of treatment rather than relying on withdrawal management alone.
What Treatment Options Are Available After an Opioid Overdose?
Following an opioid overdose, treatment may help reduce the likelihood of continued harmful substance use and future overdose.
The appropriate approach depends on the person’s medical condition, substance-use history, withdrawal needs, and individual preferences.
Medically Supervised Opioid Detox
Individuals experiencing opioid dependence may benefit from opioid detox in Tennessee to address withdrawal symptoms and determine appropriate next steps.
Fentanyl Withdrawal Treatment
Fentanyl dependence can create complex withdrawal and medication-timing considerations.
Our fentanyl detox program in Tennessee provides individualized withdrawal management and treatment planning.
Residential Addiction Treatment
Some individuals benefit from a structured treatment environment after medical stabilization.
Residential treatment may include individual counseling, group therapy, relapse-prevention education, and coordinated mental health support.
Medication and Continuing Care
For opioid use disorder, ongoing medication treatment can be an important part of reducing overdose risk.
Outpatient counseling, psychiatric treatment, recovery support, and continued medical follow-up may also form part of a comprehensive plan.
The goal is to connect immediate medical stabilization with effective long-term treatment when appropriate.
Finding Medical Detox Near Nashville, Tennessee
Tennessee Detox Center provides medically supervised addiction detox services in La Vergne, Tennessee, near Nashville.
Our programs serve individuals from Murfreesboro, Smyrna, Brentwood, Franklin, Rutherford County, Davidson County, and surrounding Middle Tennessee communities.
For someone who has survived an overdose, determining the appropriate next step begins with understanding current medical stability, substance-use history, withdrawal risk, and treatment needs.
Our admissions team can discuss available detox services, insurance verification, and the process of entering treatment.
Anyone with active medical complications after an overdose should receive emergency or hospital-based care before entering a detox setting that cannot manage those complications.
Addiction recovery is not limited to managing withdrawal. An effective plan should also consider overdose prevention, mental health, continuing treatment, and support for long-term recovery.
Frequently Asked Questions About Surviving a Drug Overdose
Can a drug overdose cause permanent organ damage?
Yes. A severe overdose can cause lasting injury to the brain, kidneys, heart, lungs, or other organs. However, permanent damage does not occur in every case. The outcome depends on the substance, severity of the event, complications, and how quickly appropriate treatment begins.
Can you feel normal after an overdose and still have complications?
Yes. Some complications, including acute kidney injury, may not cause obvious early symptoms. Medical evaluation and recommended follow-up are important even if someone feels better after an overdose.
How long does it take to recover from an opioid overdose?
Recovery varies. Some immediate effects may improve within hours of emergency treatment, while complications involving breathing, brain function, or other organs may require longer monitoring or recovery.
What happens to your brain when you overdose?
An opioid overdose can slow or stop breathing, reducing oxygen delivery to the brain. Severe oxygen deprivation can cause brain injury. Stimulants and other substances may cause additional neurological complications, including seizures.
Can an overdose cause kidney failure?
Yes. Severe overdose complications may cause acute kidney injury, which can progress to kidney failure in some cases. However, many people with acute kidney injury recover some or all kidney function with appropriate medical treatment.
Should you go to the hospital after receiving Narcan?
Yes. Naloxone can temporarily reverse opioid-related respiratory depression, but emergency assessment is still necessary. Some opioids can outlast naloxone, and other medical complications may be present.
Does surviving an overdose mean someone needs rehab?
Not automatically. An overdose can occur without an established substance use disorder. However, an overdose is an important opportunity for medical assessment, substance-use screening, overdose-prevention planning, and discussing treatment when appropriate.
Can medical detox prevent another overdose?
Medical detox can help someone manage physical dependence and withdrawal, but detox alone does not guarantee prevention of future overdose. Ongoing evidence-based addiction treatment, medication for opioid use disorder when appropriate, naloxone access, and continuing recovery support are important.
Medical Sources
Centers for Disease Control and Prevention. (October 22, 2026). Acute Kidney Injury Among Patients with Drug Overdose–Involved Hospitalizations, United States, 2016–2025. Morbidity and Mortality Weekly Report. https://www.cdc.gov/mmwr/volumes/75/wr/mm7541a1.htm
Centers for Disease Control and Prevention. About Naloxone. https://www.cdc.gov/overdose-prevention/reversing-overdose/about-naloxone.html
National Institute on Drug Abuse. Naloxone DrugFacts. https://nida.nih.gov/publications/drugfacts/naloxone
Substance Abuse and Mental Health Services Administration. Medications for Opioid Use Disorder, Treatment Improvement Protocol 63. https://library.samhsa.gov/product/tip-63-medications-opioid-use-disorder/pep21-02-01-002
National Kidney Foundation. Acute Kidney Injury (AKI). https://www.kidney.org/kidney-topics/acute-kidney-injury-aki
This article is intended for educational purposes and does not replace diagnosis, emergency medical care, or treatment by a qualified healthcare professional. Clinical review is recommended before publication.
Recovery After an Overdose Starts With Medical Care and Support
Surviving a drug overdose is not always the end of the medical emergency.
Depending on the substances involved, the body may continue recovering from complications affecting breathing, circulation, kidney function, muscles, and other vital systems.
The CDC’s October 2026 research reinforces the importance of recognizing serious complications following overdose-related hospitalization.
For people experiencing substance dependence, addressing withdrawal and connecting with appropriate addiction treatment can be an important next step after medical stabilization.
Tennessee Detox Center provides medically supervised detox near Nashville, helping individuals understand their treatment options and develop a plan for continued recovery.
If you or someone you love is struggling with substance use, contact Tennessee Detox Center to discuss a confidential assessment and available treatment services.
If an overdose is suspected or someone is experiencing an active medical emergency, call 911 immediately.
