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What to do if…
you think you took a double dose of a prescription medicine by mistake

Produced and maintained by PanicStation.org Published: Last reviewed: Editorial policy UK guide

Short answer

Do not take another dose until you have checked what to do. Get urgent advice through the right route for where you are in the UK, and call 999 now if there are severe symptoms.

Do not do these things

  • Do not take another dose “to be safe” while you are unsure what happened.
  • Do not try to “balance it out” by taking extra later, skipping several doses, or changing the schedule yourself.
  • Do not add over-the-counter medicines that may overlap with your prescription, including cold and flu products, until a pharmacist or clinician has checked them.
  • Do not take home remedies, antidotes, or anything meant to make you sick.
  • Do not drink alcohol, drive, cook, use tools, or do risky tasks if you feel drowsy, dizzy, confused, shaky, faint, or unwell.
  • Do not stop a medicine suddenly if the label or leaflet says not to stop suddenly; get urgent advice on the next dose instead.

What to do now

  1. Pause the medicine.
    Put the packet, bottle, blister strip, or pill organiser in front of you. Do not take more of that medicine until you have specific advice.

  2. Check what probably happened.
    Count the tablets or capsules left, check the blister strip, look at your pill organiser, and check any alarm, app, diary, or text reminder. If you still cannot tell, treat it as a possible double dose.

  3. Write down the key details before you call.
    Note the medicine name, strength, how many tablets or capsules you may have taken, the time or times taken, what else you took today, your age, and any symptoms. Keep the packaging with you.

  4. Get urgent dosing advice.
    Use the urgent medical advice route for where you are in the UK: NHS 111 in England and Wales, NHS 24 111 in Scotland, or GP out-of-hours routes in Northern Ireland. If a community pharmacy is open, a pharmacist can also help with medicine-specific advice, but use urgent medical help if symptoms are present or the medicine may be high risk.

  5. Call 999 now if any red flags appear.
    Call 999 if there is trouble breathing, chest pain, a seizure, collapse, fainting, severe drowsiness, severe confusion, blue or very pale skin, severe allergic swelling of the face, lips, tongue, or throat, or if the person cannot be woken normally. Do not drive yourself to hospital.

  6. Act faster for medicines where an extra dose can matter even before symptoms start.
    Get urgent advice immediately, especially for medicines for blood sugar, blood thinning, heart rhythm, blood pressure, seizures, strong pain relief, sleep, anxiety, sedation, or if the leaflet says overdose may be serious.

  7. Do not be alone if drowsiness or confusion is possible.
    Ask someone to stay with you or check on you until you have advice. If you become hard to wake, very confused, or your breathing changes, they should call 999.

What can wait

  • You do not need to decide today whether to change your long-term routine or switch medicines.
  • You do not need to work out the whole dosing schedule yourself; wait for clear advice about the next dose.
  • You can sort prevention later, such as alarms, a tick-list, a different pill organiser, or storing medicines separately.

Important reassurance

Medication double-dose mistakes are common, especially when routines change or you are tired, distracted, or worried. The safest next step is not to guess; it is to pause, keep the packaging nearby, and get medicine-specific advice.

Scope note

These are first steps only. The safest plan depends on the exact medicine, dose, timing, symptoms, and your health conditions, and later decisions may need a pharmacist, prescriber, or urgent care clinician.

Important note

This guide is general information only. It is not legal, medical, financial, therapeutic, or other professional advice, and it is not a substitute for advice from a pharmacist, prescriber, NHS urgent care service, or emergency service.

Additional Resources

Closely connected guides that may be useful during the same situation or its immediate aftermath.

About this guide

This guide was produced and is maintained by PanicStation.org using its published editorial process. Official and specialist sources are checked where relevant, and AI-assisted tools may be used for drafting, organisation, and consistency checks. The site operator remains responsible for publication, revision, and removal decisions.

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