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What to do if…
you accidentally take someone else’s prescription medication

Short answer

Do not take any more medication. Call Poison Control now (1-800-222-1222) for fast, expert instructions — and call 911 immediately if there are severe symptoms.

Do not do these things

  • Do not try to “sleep it off” if you feel unusually drowsy, confused, faint, or worse than expected.
  • Do not take another dose of your medication to compensate.
  • Do not induce vomiting unless Poison Control or a clinician specifically tells you to.
  • Do not drink alcohol or use recreational drugs to cope — it can intensify effects and complicate care.
  • Do not drive yourself to urgent care or the ER.
  • Do not throw away the bottle/packaging — identifying the exact drug and strength matters.

What to do now

  1. Check for emergency danger signs. Call 911 if any apply.
    Call 911 now if the person collapses, has a seizure, has trouble breathing, can’t be awakened, has severe chest pain, or shows signs of a severe allergic reaction (face/lip/tongue swelling, widespread hives with breathing problems).
  2. If stable, contact Poison Control immediately: 1-800-222-1222.
    Tell them you accidentally took someone else’s prescription medication and you want urgent guidance. (This connects you to your local poison center anywhere in the U.S.)
  3. Get the key details in front of you (while you’re on the phone).
    • medication name and strength (from the label/box)
    • how much was taken and when
    • age and approximate weight
    • existing health conditions
    • other meds taken today (including OTC), plus alcohol or drugs
  4. Keep the person safe while you wait for instructions.
    • Stay with someone if possible; sit or lie down somewhere safe.
    • Avoid stairs, showers, cooking, and anything that could cause a fall if dizziness or drowsiness starts.
    • If symptoms worsen at any point, switch to 911.
  5. If opioids might be involved, treat slowed or stopped breathing as an emergency.
    • Call 911 now and stay with the person until help arrives.
    • If naloxone is available, give it as quickly as possible and follow the product instructions.
    • Naloxone can wear off; more than one dose may be needed. Keep following 911/dispatcher instructions.
  6. If you’re told to go to the ER/urgent care, bring the container.
    Take the pill bottle/blister pack/box with you so clinicians can identify the medication quickly and accurately.

What can wait

  • You do not need to self-diagnose by Googling side effects — Poison Control can tell you what matters for this specific drug and dose.
  • You do not need to decide right now whether to file complaints, reports, or insurance paperwork — focus on immediate safety first.
  • You do not need to solve the “how did this happen” problem until the medical risk is addressed.

Important reassurance

Medication mix-ups happen to careful people — especially when bottles look similar or routines are disrupted. Calling Poison Control quickly is a strong, normal step that often prevents complications.

Scope note

This covers first actions for the next hour or two. After you’ve gotten Poison Control guidance or medical assessment, you can handle follow-up (pharmacy/doctor review, preventing a repeat mix-up).

Important note

This is general information, not medical diagnosis or personalized treatment. If there are severe, sudden, or worsening symptoms, call 911. For immediate, tailored poisoning/medication exposure guidance in the U.S., call Poison Control at 1-800-222-1222.

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