Medications
Epilepsy Medicines Before Surgery
If you have epilepsy, the most important rule around surgery is simple: keep taking your medicines on time, including the morning of the operation. Here's why missing doses is risky, and what to remind your team.
Quick answer
Why it matters
Anti-epileptic medicines work by holding a steady, protective level in your bloodstream. Skip a dose and that level dips — which is exactly when a breakthrough seizure becomes more likely. Surgery itself adds extra triggers (stress, tiredness, a disturbed routine, missed sleep), so this is the worst possible time to fall behind. That's why your normal morning dose is usually taken even while fasting, with a sip of water.
The fasting rule before an anesthetic is about food and drink — it is not a reason to skip essential tablets. A small sip of water to swallow your medicines is allowed and expected. If you're worried about timing, the answer is to ask your team, not to leave the dose out. Many people miss doses because they assume 'nil by mouth' means no tablets — it doesn't.
If you might not be able to swallow tablets for a while after surgery, your team can plan ahead — some epilepsy medicines (such as levetiracetam, sodium valproate and phenytoin) can be given through a drip so you don't go without cover. Others, like lamotrigine, need careful handling because restarting at the wrong dose after a gap can be unsafe. This is all routine for the anesthesia and ward teams once they know you have epilepsy — so make sure it's on your record and said out loud. For the bigger picture on what's held versus continued, see medications before surgery (A–Z).
Do not stop without instruction
What to ask your doctor
- Should I take my normal epilepsy doses on the morning of surgery? (Usually yes, with a sip of water.)
- If I can't swallow tablets afterward, can my medicine be given through a drip so I don't miss a dose?
- Are any of the anesthetic or pain medicines you plan to use likely to interact with my epilepsy medication?
- How soon after surgery will I be able to restart my normal tablets and schedule?
Red flags — call your team
Red flags — call your team
- Any seizure before or after surgery, or seizures that come closer together or last longer than usual — tell staff straight away, as this can follow missed doses.
- A seizure lasting more than 5 minutes, or one seizure running into another without recovery in between — this is a medical emergency (status epilepticus); call for help immediately.
- Realising you've missed a dose, or being told to stay 'nil by mouth' with no plan for your epilepsy medicines — flag it at once and ask how you'll be covered.
References
- Epilepsy Action and the Association of Anaesthetists — people with epilepsy are advised to continue anti-epileptic medication through the perioperative period, including the day of surgery. epilepsy.org.uk
- BJA Education / British Journal of Anaesthesia — perioperative management of patients with epilepsy. bjaed.org. As always, your own anesthesia team's instruction takes precedence over any general guidance.
Frequently asked questions
Do I take my epilepsy medicine on the morning of surgery?
Usually yes. Anti-epileptic medicines such as levetiracetam (Keppra), valproate, carbamazepine, lamotrigine and phenytoin are normally taken right up to and including the morning of surgery, with a small sip of water — even while fasting. Missing a dose lets the protective drug level drop and makes a seizure more likely. Always confirm with your own team, but the default is don't miss a dose.
Does the no-food fasting rule mean I skip my tablets?
No. The fasting (nil by mouth) rule is about food and most drinks, to keep your stomach empty for anesthesia. It is not a reason to skip essential medicines. A small sip of water to swallow your epilepsy tablets is allowed and expected. If you're unsure about timing, ask your team rather than leaving the dose out — skipping is the riskier choice.
What if I can't swallow tablets after the operation?
Your team can plan for this. Several epilepsy medicines — including levetiracetam, sodium valproate and phenytoin — can be given through a drip so you stay protected until you can take tablets again. Others, like lamotrigine, need careful dose handling after any gap. This is routine once the team knows you have epilepsy, so make sure it's clearly on your record.
Is it dangerous to stop epilepsy medicine before surgery?
Yes. Stopping anticonvulsants suddenly can cause breakthrough seizures or a prolonged, life-threatening seizure state called status epilepticus. This is why epilepsy medicines are almost always continued rather than held. Never pause them on your own to 'prepare' for surgery — if any timing change is needed, your neurologist and anesthesia team arrange it together.