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What to do if…
you realise you may have taken two medicines that should not be combined

Short answer

Pause any further doses and get urgent, personalised advice now: use NHS 111 (online if appropriate, or by phone). If there are severe symptoms, call 999.

Do not do these things

  • Do not “wait and see” if you have worrying symptoms (breathing trouble, fainting/collapse, seizures, severe chest pain, cannot be fully woken, severe confusion/agitation).
  • Do not take another dose “to cancel it out” or try to self-treat the interaction with other medicines, supplements, or alcohol.
  • Do not make yourself vomit or take “detox” products.
  • Do not throw away the packaging—details matter.
  • Do not drive, cycle, or operate machinery if you feel drowsy, dizzy, confused, or unwell.

What to do now

  1. Check for emergency red flags (right now). Call 999 if you (or the person who took the medicines) are struggling to breathe, collapsing/fainting, having a seizure, cannot be fully woken, have severe chest pain, or are rapidly getting worse.
  2. If it’s not immediately life-threatening, contact NHS 111 urgently.
    • Use 111 online if the person is aged 5 or over.
    • Call 111 if the person is under 5, or if you cannot use the online service. Tell them you may have taken a risky combination of medicines and follow their advice exactly.
  3. Gather the “interaction facts” before you call (or while you’re on hold). Put the medicines in front of you and note:
    • exact names (including strength, e.g., “20 mg”), and whether prescription or over-the-counter
    • how much you took (number of tablets / mL)
    • what time you took each one (and whether you took food or alcohol)
    • your age, approximate weight, and any kidney/liver problems, pregnancy, or major conditions
    • any symptoms you feel right now.
  4. Pause further doses until you’ve spoken to 111 (unless told otherwise). If you’re on a medicine where missing a dose may be risky (for example, for seizures), tell 111 what it is and when the next dose is due so they can advise safely.
  5. If symptoms start while you’re waiting, escalate. If you develop breathing difficulty, severe drowsiness, chest pain, severe confusion/agitation, or you feel you might pass out, call 999.
  6. If you’re told to attend urgent care/A&E, bring everything. Take the medicine packets/blister strips, any patient information leaflets, and a written list of what you took and when.

What can wait

  • You do not need to figure out “which medicine is to blame” right now.
  • You do not need to permanently stop a long-term prescription today—focus on urgent advice and what to do about the next dose.
  • You do not need to report anything formally unless a clinician advises it.

Important reassurance

Mix-ups and accidental overlaps happen, especially with similar packaging and multi-symptom cold/flu remedies. Getting advice quickly is the safest move, and acting early (including not taking more doses) can prevent avoidable harm.

Scope note

This is first-steps guidance for the next hour or two. Later decisions (restart timing, monitoring, or changes to your medicines) should be based on advice from NHS 111, a pharmacist, or your prescriber.

Important note

This guide is general information, not a diagnosis or personalised medical advice. If you feel seriously unwell or symptoms are escalating, treat it as an emergency and call 999.

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