PanicStation.org
UK USA
uk Health & medical scares double dose • took two doses • accidental extra dose • took medicine twice • prescription overdose worry • unsure if i took it • took my tablet twice • took pills twice • wrong dose by mistake • extra dose of meds • medication dosing mistake • double dosed my prescription • took another dose accidentally • mixed up my medicines • took dose too soon • swallowed extra capsule • pill organiser confusion • missed vs extra dose confusion

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

Short answer

Do not take another dose until you’ve checked what to do: contact NHS 111 or a community pharmacist with the medicine name/strength and the time you took it—call 999 if there are severe symptoms.

Do not do these things

  • Do not “balance it out” by taking extra later, skipping multiple doses, or changing your schedule without advice.
  • Do not take another dose “to be safe” while you’re unsure what happened.
  • Do not add over-the-counter products that might overlap (for example, cold/flu medicines containing paracetamol) until you’ve checked ingredients.
  • Do not take “antidotes” or home remedies, or try to make yourself sick.
  • Do not drink alcohol, drive, or do risky tasks if you feel drowsy, dizzy, confused, shaky, or unwell.
  • If your medicine label/leaflet says “do not stop suddenly”, do not make your own changes—get urgent advice on the next step.

What to do now

  1. Work out whether it’s likely you doubled (2 minutes).
    Check your blister pack/pill organiser, count what’s left, and check any reminder app/text you use. If you still cannot be sure, treat it as a possible double dose.
  2. Write down the essentials before you call.
    Medicine name, strength (mg/micrograms), how many tablets/capsules, the time(s) taken, other medicines/supplements taken today, your age (and approximate weight if you know it), and any symptoms.
  3. Get advice promptly from the right place.
    • Call NHS 111 for urgent advice if you might have taken a double dose.
    • If a community pharmacy is open, you can ask the pharmacist for immediate dosing-error advice (have the packaging in front of you).
  4. Call 999 (or go to A&E if you can get there safely) if any red flags appear.
    Call 999 if you/they have: trouble breathing, chest pain, seizures, collapse/fainting, severe drowsiness, severe confusion, you cannot be woken normally, or severe allergic swelling (face/lips/tongue), or you’re rapidly getting worse.
  5. Keep the packaging and avoid compounding the dose.
    Put the box/bottle and leaflet somewhere visible. Until you’ve had advice, do not take more of the same medicine and avoid common “double-ups” like paracetamol-containing products.
  6. Treat certain medicines as “act now” even if you feel okay.
    If the medicine is for blood sugar (e.g., insulin or sulfonylureas), blood thinning (e.g., warfarin/DOACs), heart rhythm/blood pressure, seizures, strong pain relief (opioids), or sedation (e.g., benzodiazepines), contact NHS 111 immediately rather than waiting for symptoms.
  7. If drowsiness is possible, don’t ride it out alone.
    If the medicine can cause sleepiness (for example, opioids, sedatives, some strong allergy medicines), ask someone to stay with you or check in regularly until you’ve had advice—and avoid going to sleep “to see if it passes”.

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 “make up” or “cancel out” doses—wait for clear, specific guidance.
  • You can sort prevention (alarms, a written tick-list, changing how you store medicines) after you’re safe and have the next-step plan.

Important reassurance

This is a common mistake, especially when you’re tired, distracted, or your routine changes. Getting advice early is the safest way to keep a small error from turning into a bigger problem.

Scope note

These are first steps for the next hour or two. The safest plan depends on the exact medicine, dose, and your health conditions.

Important note

This guide is general information, not a diagnosis or a substitute for a clinician’s judgement. If symptoms worsen, or you’re unsure at any point, seek urgent medical help.

Additional Resources
Support us