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Fentanyl use can cause unusual drowsiness, small pupils, confusion, dizziness, nausea, constipation, and slowed breathing. These signs do not prove fentanyl exposure. A person who cannot wake up or is breathing slowly may be overdosing. Call 911 immediately and give naloxone if available, even when you are unsure.

This guide explains what to notice, how withdrawal differs from overdose, and what to discuss with a clinician in New Mexico. It offers general education, not a diagnosis. Choice Recovery Path offers outpatient care and intensive outpatient programming, or IOP, at its Albuquerque and Las Cruces locations.

What are symptoms of fentanyl use that you might notice?

Fentanyl is a powerful opioid. Some effects may be visible, while others are things a person reports feeling. You might notice someone becoming unusually sleepy during a conversation, losing track of what you said, or feeling sick after taking an unknown pill.

Possible signs and symptoms include the following:

  • The person may seem unusually drowsy or repeatedly drift off while sitting or talking.
  • Their pupils may look smaller than usual, although pupil size alone cannot identify a drug.
  • They may feel dizzy, confused, or less alert than they normally do.
  • They may report nausea, vomiting, constipation, or difficulty urinating.
  • Their breathing may become slow or shallow, which requires immediate attention.

The NIH's Fentanyl 101 guide describes these physical effects. Someone does not need to show every symptom for the situation to be serious.

Appearance can be misleading. A person may have taken an opioid without obvious changes that a family member can spot. Another person may show similar symptoms because of a different medication or illness. Avoid treating a symptom checklist as a test that proves or rules out fentanyl use.

If someone is awake but unusually sleepy, stay nearby while arranging medical guidance. Do not have them drive. If they become difficult to wake or their breathing slows, call 911. Waiting to see whether they sleep it off can delay lifesaving care.

Dunes a few miles into White Sands National Park, New Mexico — how can you recognize fentanyl use

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Which symptoms mean a possible fentanyl overdose?

An overdose can suppress breathing enough to deprive the brain and body of oxygen. The most urgent questions are whether the person responds and whether they are breathing normally.

  • The person cannot be awakened or loses consciousness.
  • Their breathing is slow, shallow, irregular, or absent.
  • They make choking, gurgling, or unusual snoring sounds and cannot be awakened.
  • Their lips or nails appear discolored, including blue or gray changes.
  • Their pupils may be extremely small.

Do not wait for all these signs. Unresponsiveness or abnormal breathing is enough to seek emergency help. An unfamiliar noise from someone who cannot wake up should not be dismissed as ordinary snoring.

You also do not need to know what the person took. Someone may believe they used another substance, or a bystander may have no information about drug use. Tell the dispatcher what you can observe rather than trying to name the drug with certainty.

For example, saying, “They are not waking up, and their breathing is very slow,” gives the dispatcher useful information. Provide the exact address, apartment number, or a clear description of your location. Follow their instructions while help is on the way.

Burnham Badlands, New Mexico — how can you recognize fentanyl use

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What to do while emergency help is coming

Call 911 immediately for a suspected overdose and give naloxone if available. If another person is present, one person can call while the other gives naloxone. Do not delay either step to search for proof of fentanyl use.

  1. Call 911, explain that the person is unresponsive or breathing abnormally, and give your location.
  2. Administer naloxone according to the product instructions if you have it.
  3. If normal breathing has not returned after two to three minutes, give another dose according to the instructions and dispatcher guidance.
  4. Support breathing with rescue breaths or CPR as directed by the dispatcher or your training.
  5. If the person is breathing normally but remains unconscious, place them on their side to reduce choking risk.
  6. Stay with them until emergency responders arrive, even if they wake up.

Naloxone can reverse an opioid overdose, including one involving fentanyl, but its effect is temporary. The FDA explains that overdose symptoms can return after someone improves. Emergency evaluation remains necessary.

Do not leave the person alone, give them food or drinks, or assume waking up means the danger has passed. A treatment admissions call can wait until the immediate emergency has been addressed.

How fentanyl withdrawal differs from recent use

Withdrawal can occur when someone who has become physically dependent on an opioid stops or reduces use. It often looks different from the sedation associated with recent opioid use.

Possible withdrawal symptoms include the following:

  • The person may feel anxious, restless, or unable to sleep.
  • They may yawn repeatedly, sweat, or have watery eyes and a runny nose.
  • They may experience muscle aches, chills, or goosebumps.
  • They may have stomach cramps, nausea, vomiting, or diarrhea.
  • Their pupils may become larger, and cravings may make it difficult to focus.

MedlinePlus describes these opioid withdrawal symptoms and possible complications, including dehydration. A clinician can help assess symptoms and discuss treatment. Do not use an online timeline to decide when it is safe to start or change medication.

Withdrawal symptoms overlap with infections and other health problems. Repeated vomiting, inability to keep fluids down, or severe weakness calls for prompt medical evaluation. Pregnancy or other medical conditions also make professional guidance especially important.

Reduced tolerance after a period without opioids can increase overdose risk if someone returns to use. Feeling better after withdrawal does not mean the risk has ended. Ongoing treatment and an overdose prevention plan remain important.

If alcohol or sedatives are also involved, tell the clinician. Different substances can require different withdrawal precautions. Unresponsiveness or abnormal breathing should always be treated as an emergency rather than assumed to be withdrawal.

Why symptoms cannot confirm what someone took

Many people searching for fentanyl symptoms want a clear yes or no answer. Physical signs cannot provide that certainty. They can tell you when to seek help, but they cannot reliably identify the contents of a pill or powder.

Fentanyl test strips can help detect its presence in drug products, but a negative result does not establish safety. They also do not replace emergency care when a person has concerning symptoms.

Clinical testing has limits as well. The American College of Medical Toxicology explains that many standard opiate screens do not reliably detect fentanyl without a separate assay. A positive urine result also does not establish the dose taken or current impairment.

If you have questions about a test, ask which substances it covers and whether confirmatory testing is needed. Do not delay an overdose response while waiting for a result.

For a medical visit, share what is known: medications, possible substances, approximate timing, observed symptoms, and any naloxone given. “I am not sure what was in the pill” is useful information. You do not need a perfect account before seeking care.

When patterns suggest a need for an opioid assessment

A single symptom does not diagnose opioid use disorder. A clinician considers how opioid use affects a person's health, responsibilities, relationships, and ability to control use.

  • The person may use more often or for longer than they intended.
  • They may want to stop but find repeated attempts difficult.
  • Cravings or time spent obtaining and recovering from opioids may disrupt daily life.
  • They may continue using despite problems at home, school, or work.
  • They may use in dangerous situations or continue despite known health problems.

These patterns deserve assessment even when someone looks well between episodes. You do not have to wait for an overdose, job loss, or another crisis to raise a concern.

Physical dependence and opioid use disorder are related but different concepts. Tolerance or withdrawal during appropriate prescribed treatment does not, by itself, establish opioid use disorder. A person taking prescribed opioids should discuss concerns with their prescriber rather than change treatment based on a blog post.

Families can focus on what has changed without assigning a diagnosis. Write down a few specific observations, such as repeated episodes of falling asleep during conversations or missed commitments. Share them with the person and encourage a professional evaluation.

How to talk with someone you are worried about

If the person is alert and there is no immediate emergency, choose a quiet time to talk. Describe what you noticed and why it concerns you. A calm conversation can make it easier to discuss an assessment.

You might say, “You have seemed very sleepy lately, and yesterday you were hard to wake. I am worried about your safety. Would you be willing to talk with a clinician?” Keep the focus on health and a manageable next step.

  • Ask whether they have felt sick, had trouble breathing, or taken an unfamiliar substance.
  • Listen to their answer without turning the conversation into an interrogation.
  • Offer practical help, such as making a call together or arranging a ride.
  • Discuss where naloxone is kept and who knows how to use it.
  • Set clear boundaries about driving, childcare, or other tasks when someone is impaired.

A person may feel embarrassed, frightened, or unsure how to describe their use. Leave room for uncertainty. Asking for help does not require them to explain everything in one conversation.

If they decline an assessment, you can still learn overdose response steps and ask a healthcare professional about your concerns. Avoid arguing with someone who is intoxicated. Return to the conversation when they can participate safely.

For suicidal thoughts or an emotional crisis, call or text 988 for the 988 Suicide & Crisis Lifeline. A suspected overdose or immediate physical danger requires 911.

Finding the right next step in New Mexico

For families in Albuquerque, Las Cruces, or elsewhere in New Mexico, the next step depends on the person's current condition. A breathing emergency requires emergency responders. Possible withdrawal or ongoing opioid concerns require a clinical assessment.

Once immediate safety concerns are addressed, treatment planning should consider medical needs, mental health, substance use patterns, and support at home. Ask how the proposed plan addresses opioid cravings and overdose risk.

Medications for opioid use disorder are an important part of evidence-based care. SAMHSA describes buprenorphine, methadone, and naltrexone as approved treatment options. Medication choice and timing require a qualified clinician. Ask any prospective provider what they offer directly and what requires a referral.

Some people need withdrawal management or a more supervised setting before outpatient care. Detoxification, residential treatment, and partial hospitalization are separate services to discuss with a clinician when appropriate. These are educational and referral considerations, not services being represented as available at Choice Recovery Path.

Talking with Choice Recovery Path about outpatient care

Choice Recovery Path offers outpatient care and IOP at its verified Albuquerque and Las Cruces locations in New Mexico. An assessment helps determine whether an outpatient setting is appropriate for the person's needs.

IOP generally provides more scheduled treatment contact than standard outpatient care while a person continues living outside the program. It does not provide the continuous supervision of residential care or replace emergency treatment. You can learn more about this level of care on the intensive outpatient program page.

If you are worried about fentanyl use and the person is medically stable, call Choice Recovery Path at (505) 526-3649 or review the admissions information. You can describe what you have noticed and ask about an assessment without having a diagnosis.

If someone cannot wake up or is breathing abnormally, call 911 immediately and give naloxone if available. Address the emergency first.