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What to do if…
you start a new medicine and feel faint, unusually restless, or severely sweaty

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

Short answer

Sit or lie down now, do not drive, and do not take another dose until you have been told what to do by Poison Control, your prescriber, a pharmacist, or emergency clinicians. Call 911 now if you pass out, have trouble breathing, have swelling of the face, lips, tongue, or throat, have a seizure, cannot be awakened, or symptoms are rapidly worsening.

Do not do these things

  • Do not drive, stand on a ladder, cook over heat, or operate anything risky while you feel faint, shaky, sweaty, restless, confused, or unsteady.
  • Do not take another dose “to test it” until a qualified professional tells you what to do.
  • Do not abruptly stop a prescribed medicine unless Poison Control, your prescriber, a pharmacist, or emergency clinicians tell you to.
  • Do not mix alcohol, cannabis, sedatives, or other drugs to calm yourself down.
  • Do not stay alone if you feel like you might faint, collapse, become confused, or get worse.

What to do now

  1. Get into a safer position immediately.

    • If you feel faint, lie flat and raise your legs if you can.
    • If breathing feels hard, sit upright instead.
    • Keep the room cool, loosen tight clothing, and ask someone nearby to stay with you.

  2. Check for “call 911 now” signs. Call 911 if any of these are present, especially soon after a first dose or dose increase:

    • Trouble breathing, wheezing, throat tightness, or swelling of the lips, face, tongue, or throat
    • Widespread hives or rash with swelling, breathing trouble, faintness, or rapid worsening
    • Fainting, collapse, seizure, severe confusion, or cannot be awakened
    • Severe chest pain, blue or gray lips, or new one-sided weakness

  3. If you have epinephrine for anaphylaxis and you think this is a severe allergic reaction, use it and call 911. Bring the injector with you and tell responders what you used and when.

  4. Watch for a serious medicine reaction, not just “anxiety.” If sweating or restlessness comes with fever, shaking, tremor, muscle stiffness, diarrhea, confusion, very fast heartbeat, fainting, or symptoms that are quickly worsening, seek urgent medical help now or call 911.

  5. If you are stable and awake, call Poison Help now for medication-reaction triage. Call 1-800-222-1222. It is the U.S. Poison Help line and routes to poison specialists. Tell them:

    • the medicine name, dose, and time taken
    • whether this was the first dose, a dose increase, or a restarted medicine
    • your symptoms: faintness, restlessness, sweating, shaking, rash, breathing symptoms, confusion, chest pain, fever, vomiting, diarrhea, or fast heartbeat
    • all other prescription medicines, over-the-counter medicines, supplements, alcohol, cannabis, or other substances taken today

  6. Use webPOISONCONTROL only if it fits your situation. The online tool may help for some poison or medicine exposures, but call Poison Help instead if the person is pregnant, younger than 6 months, older than 79, exposed to more than one product or substance, or the situation involves self-harm.

  7. Contact the prescriber or pharmacist the same day. Ask directly: “Should I take the next dose?” and “Could this be a serious side effect, allergy, or interaction?” If they tell you to go to urgent care or the ER, go.

  8. If you have diabetes or known low blood sugar episodes, check your glucose now. Treat low blood sugar using your usual plan, and still seek advice if symptoms persist, return, or do not clearly match your usual low blood sugar pattern.

  9. Make a quick timeline and keep the packaging. Write down when you took the medicine, when symptoms started, and whether symptoms are getting better or worse. Keep the bottle, box, medication guide, and any pill organizer with you.

What can wait

  • You do not have to decide now whether you will stay on this medicine long-term.
  • You do not need to figure out by yourself whether this is a side effect, allergy, interaction, low blood sugar, panic, or another cause.
  • Formal side-effect reporting can wait until you are stable and have medical guidance.
  • Non-urgent messages, internet searching, and detailed medication research can wait until the immediate safety question is settled.

Important reassurance

These symptoms can feel intense and frightening, especially after starting or increasing a medicine. Getting help quickly is a sensible safety step, not an overreaction, and it can help you get clear instructions about the next dose.

Scope note

These are first steps only for the first hours after symptoms begin. Medication reactions and interactions vary widely, and later decisions may need help from a prescriber, pharmacist, poison specialist, urgent care clinician, or emergency department.

Important note

This is general information, not medical advice, diagnosis, treatment, or professional advice. If breathing is hard, you collapse, you have a seizure, you cannot be awakened, or symptoms are rapidly worsening, call 911.

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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