Antiepileptic medicines (Epilim, Lamictal, Keppra and others) — patient guide

This page covers the eight antiepileptic medicines most commonly used in Australia. This is your page if your medicine is one of these. Sodium valproate (Epilim, Valpro). Lamotrigine (Lamictal). Levetiracetam (Keppra). Carbamazepine (Tegretol). Phenytoin (Dilantin). Topiramate (Topamax). Oxcarbazepine (Trileptal). Or lacosamide (Vimpat). Gabapentin and pregabalin live on a separate page. See the gabapentinoids guide.

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Find your medicine

Generic name	Common brand names	Strengths	How often
Sodium valproate	Epilim, Epilim EC, Epilim Crushable, Epilim Liquid, Valpro, Valpro EC, generics	100 / 200 / 500 mg	Twice daily; modified-release once daily
Lamotrigine	Lamictal, generics	25 / 50 / 100 / 200 mg	Twice daily at maintenance; slow titration at start
Levetiracetam	Keppra, Keppra liquid, generics	250 / 500 / 750 / 1000 mg	Twice daily
Carbamazepine	Tegretol, Tegretol CR, suspension, generics	100 / 200 / 400 mg	Twice to three times daily; CR twice daily
Phenytoin	Dilantin, Dilantin Infatabs, Phenytoin Sandoz, generics	30 / 100 mg	Once or twice daily
Topiramate	Topamax, Topamax Sprinkle, generics	25 / 50 / 100 / 200 mg	Twice daily
Oxcarbazepine	Trileptal, generics	150 / 300 / 600 mg	Twice daily
Lacosamide	Vimpat, generics	50 / 100 / 150 / 200 mg	Twice daily

All eight are Schedule 4 (S4) — prescription-only medicines. None are controlled drugs in Australia. Sodium valproate carries an extra layer: a TGA-endorsed Pregnancy Prevention Programme that applies to any female of reproductive potential — see the section below.

Closely related families. Gabapentinoids (gabapentin and pregabalin) are also AEDs, used mainly for nerve pain and anxiety. SSRIs and SNRIs overlap as bipolar-depression and trigeminal-neuralgia alternatives. DOACs, MHT/HRT, and statins have major interactions with the enzyme-inducer AEDs on this page.

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What these medicines treat

Your reason for being on one of these medicines is likely one of the following:

• Epilepsy — focal (partial-onset) seizures, generalised seizures, or a specific epilepsy syndrome. The choice of AED depends on several factors. Seizure type. Your age. Your sex. Your reproductive plans. Your other medicines. Your other medical conditions.
• Bipolar disorder — sodium valproate for acute mania (TGA-approved). Lamotrigine for bipolar depression maintenance (TGA-approved). Carbamazepine as an alternative mood stabiliser.
• Trigeminal neuralgia — carbamazepine (TGA-approved). Oxcarbazepine is a common specialist alternative.
• Migraine prevention — topiramate (TGA-approved for migraine prophylaxis in adults).
• Status epilepticus and acute seizure emergencies — IV levetiracetam, phenytoin, sodium valproate. Hospital and emergency-department territory.

Your AED was chosen by your treating specialist. Neurologist for epilepsy. Psychiatrist for bipolar use. Pain specialist for trigeminal neuralgia. The integrative GP supports that plan day-to-day. We watch for side effects and interactions. We coordinate care across your other prescribers.

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The basics — read these first

1. Take your AED at the same times every day. Most are twice daily; phenytoin and modified-release valproate are once daily; carbamazepine immediate-release may be three times daily. Missing doses and erratic timing both raise seizure risk.
2. Never stop suddenly. Abrupt cessation of any AED can trigger breakthrough seizures, status epilepticus, or rebound mood episodes in bipolar use. Any taper is planned with your specialist and is typically slow.
3. Tell every prescriber and pharmacist what AED you take before any new medicine — prescription, over-the-counter, herbal, or supplement — is added. AED interactions are common and clinically important.
4. Carry medical identification — a card, bracelet, or phone lock-screen note that names your AED and your specialist. Useful for ambulance crews, ED staff, and travel.
5. Call 000 for a seizure lasting over 5 minutes, repeated seizures without recovery in between, a first-ever seizure, injury during a seizure, breathing difficulty, or any sign of a serious skin reaction (widespread rash, blistering, fever, mouth or eye involvement).

Everything else — pregnancy planning, pharmacogenomic testing, drug interactions, the integrative angle — is below.

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The pregnancy block — read this if you are female and could become pregnant

This is the single most important safety conversation for sodium valproate. It is also a serious conversation for several other AEDs.

Sodium valproate (Epilim, Valpro) — TGA Pregnancy Prevention Programme is mandatory

Sodium valproate carries the highest pregnancy harm of any medicine on this page. The risk numbers are stark. About 1 in 10 babies exposed to valproate in pregnancy develop a major congenital malformation. That includes spina bifida, heart defects, craniofacial defects, and limb defects. About 30 to 40 percent have a neurodevelopmental impact. That includes autism spectrum, ADHD, and lower IQ (Tomson EURAP 2018, Meador NEAD 2013).

The TGA-endorsed Valproate Pregnancy Prevention Programme is mandatory. It applies to any female of reproductive potential on sodium valproate. The components are:

• Annual specialist review to reconfirm valproate is still the best choice. The review checks no safer alternative fits your epilepsy or bipolar condition.
• Effective contraception documented. An IUD or implant is more reliable than the combined oral contraceptive pill. The pill can be less effective with several AEDs.
• A co-signed risk-acknowledgement form. The form confirms the foetal-harm signal has been explained and understood.

Are you on valproate? Is pregnancy on the table in the next year — even if not currently planned? Book a dedicated appointment with your specialist. Discuss the PPP and pre-conception transition options. Lamotrigine and levetiracetam are generally the pregnancy-safer AED options. But this is true only where the seizure type permits. The call is specialist-led. It is not a switch you make yourself.

If you discover you are pregnant while on valproate, DO NOT stop it suddenly. Call your specialist or epilepsy nurse the same day. They will plan an urgent transition (RANZCOG epilepsy in pregnancy, NPS valproate). Sudden valproate cessation in pregnancy can trigger status epilepticus. That carries its own serious risks to mother and baby.

Other AEDs — known but lower pregnancy signals

• Topiramate — increased risk of cleft lip and cleft palate. Pre-conception specialist review is essential.
• Carbamazepine and phenytoin — known teratogenicity (neural-tube defects, foetal hydantoin syndrome). Pre-conception planning is needed.
• Lamotrigine and levetiracetam — generally the pregnancy-safer AEDs where seizure type permits (Tomson EURAP 2018). Lamotrigine levels fall sharply during pregnancy. Dose increases are often needed.
• Oxcarbazepine and lacosamide — less pregnancy-exposure data than the older AEDs. Specialist call.

Folate before conception

Are you a female of reproductive potential on an enzyme-inducing AED? That covers carbamazepine, phenytoin, oxcarbazepine, and topiramate. You should be on folate 5 mg/day for at least 3 months pre-conception and through the first trimester. This is higher than the standard 0.5 mg. The reason is twofold. The neural-tube-defect risk is increased on these drugs. Phenytoin also depletes folate. This is in addition to specialist pre-conception planning. It is not a replacement for it (RACGP drugs in pregnancy).

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The HLA-B*1502 block — read this if you are of Asian or Indigenous ancestry

Pharmacogenomic testing for HLA-B*1502 is required before starting carbamazepine (Tegretol) or oxcarbazepine (Trileptal) in patients of Han Chinese, Thai, Malaysian, Indonesian, Filipino, Vietnamese, Hong Kong, Singaporean, or Indigenous Australian ancestry. HLA-B*1502 carriers have approximately 80-fold increased risk of Stevens-Johnson syndrome (SJS) and toxic epidermal necrolysis (TEN) when exposed to these medicines (Chung Nature 2004).

The test is a single blood sample. If positive, an alternative AED is chosen. If negative, the medicine can be considered on this score (the slow-titration and rash-watch rules still apply to lamotrigine separately).

HLA-A*3101 is an expanding indication for additional populations — Japanese, Korean, and some European-descent patients (McCormack NEJM 2011). Discuss with your specialist whether HLA-A*3101 testing is appropriate in your individual context.

Ask your specialist whether the test has been arranged before you fill the first script.

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The rash block — Stevens-Johnson syndrome, TEN, and DRESS

Any new rash on any AED — but particularly carbamazepine, lamotrigine, phenytoin, or oxcarbazepine — is a same-day medical conversation. The serious reactions to know:

• Stevens-Johnson syndrome (SJS) and toxic epidermal necrolysis (TEN) — severe skin and mucous-membrane reactions; begin as a flu-like illness with fever, then a painful rash, then blistering and skin peeling. Often involves the mouth, eyes, and genitals. Medical emergency.
• DRESS (drug reaction with eosinophilia and systemic symptoms) — rash with fever, swollen face, swollen lymph nodes, and internal-organ involvement (liver, kidneys). Medical emergency.

The pattern to recognise:

• A new rash — even mild — in the first 8 weeks of starting any AED.
• Plus fever, mouth ulcers or sores, eye redness or pain, swelling of the face or lymph nodes, blistering, or skin peeling.

Stop the medicine and seek urgent assessment. Emergency department if widespread or systemically unwell; same-day GP review if early and limited. Most rashes turn out to be benign — but the cost of waiting on a real SJS or DRESS reaction is high, so the rule is err on the side of stopping and asking.

Lamotrigine slow titration — the critical initiation move

Lamotrigine (Lamictal) carries a real SJS/TEN signal that rises sharply with fast titration and with valproate combination (valproate roughly doubles lamotrigine levels). The standard titration is:

• 25 mg daily for 2 weeks, then
• 50 mg daily for 2 weeks, then
• escalate by 50-100 mg every 1-2 weeks until target dose.

If you are also on sodium valproate, the starting dose is halved (often 25 mg every other day) and every step is slower. The specialist will set the exact schedule for you. Follow it exactly — do not speed it up to “catch up” missed doses, and contact your prescriber the same day if you have missed multiple doses or stopped for any reason.

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The suicidality block — antiepileptic-class warning

The FDA and the TGA have issued an antiepileptic-class warning for new or worsening thoughts of self-harm or suicide. The absolute risk increase is small (approximately 1 additional case per 500 patients treated), but it is real and applies across the class — switching to a different AED does not remove it.

What to do:

• Tell your prescriber immediately if you notice new low mood, persistent thoughts of self-harm, or thoughts of suicide.
• Ask a partner, family member, or close friend to watch with you in the first weeks of starting or changing an AED, particularly with levetiracetam (which has the strongest mood-side-effect signal of the eight medicines here).
• Lifeline 13 11 14 is available 24 hours for crisis support.
• Call 000 or go to your nearest emergency department if safety is at risk right now.

The conversation with your GP about mood on an AED is non-judgemental and routine. Mood changes on an AED do not mean you are doing anything wrong — they are a known medication effect, and a switch or dose adjustment is often possible.

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The drug-interaction block — tell every prescriber

This is the conversation that gets missed most often when a new prescriber adds a new medicine. The patterns to know:

Enzyme-inducer AEDs reduce the levels of many other medicines

Carbamazepine, phenytoin, and (at higher doses) oxcarbazepine and topiramate speed up the body’s clearance of many co-prescribed medicines. The ones that matter most:

• The combined oral contraceptive pill (OCP) and progestogen-only pill — real OCP failure has been documented. Use a non-hormonal back-up (condoms). Or switch to a copper IUD. Or use a hormonal IUD (Mirena, Kyleena). The progestogen in those acts locally and is not affected.
• Warfarin — INR more variable. Closer monitoring is needed. Dose increases are likely.
• Direct oral anticoagulants (DOACs — apixaban, rivaroxaban, dabigatran) — levels reduced. They can drop into a sub-therapeutic range. Carbamazepine + apixaban is a flagged combination.
• Statins (atorvastatin, rosuvastatin, simvastatin) — levels reduced. Cholesterol management may need adjustment.
• MHT/HRT (oestradiol patches, oral oestradiol, tibolone) — oral HRT efficacy is reduced. Transdermal patches bypass first-pass liver metabolism. They are generally preferred on enzyme-inducer AEDs.
• Immunosuppressants (ciclosporin, tacrolimus, sirolimus, mycophenolate) — significantly reduced. Specialist co-management is essential.
• Other psychotropics, other AEDs, and many other medicines — always cross-check.

Sodium valproate inhibits enzymes

The most clinically important pair is valproate + lamotrigine. Valproate roughly doubles lamotrigine levels. The lamotrigine dose must be halved when combined. The slow titration becomes even slower. Topiramate + valproate increases hyperammonaemia risk. Phenytoin + carbamazepine causes bidirectional level changes.

Levetiracetam and lacosamide are the cleanest

Both have minimal drug interactions. They do not significantly reduce OCP, warfarin, statin, or MHT efficacy. This is one reason they are often first-choice modern AEDs.

Antibiotics, antifungals, and herbal interactions

• Macrolide antibiotics (clarithromycin, erythromycin) and azole antifungals (fluconazole, itraconazole, ketoconazole) raise carbamazepine levels. Toxicity risk. Choose alternatives where possible.
• Grapefruit and grapefruit juice — raises carbamazepine levels. Switch to other citrus.
• St John’s wort — strong enzyme inducer. Reduces AED levels. Can trigger breakthrough seizures. Avoid on any AED.
• Tramadol, tapentadol, and high-dose codeine — lower the seizure threshold. Discuss with your prescriber.
• Antacids containing aluminium or magnesium (Mylanta, Gaviscon) — reduce phenytoin absorption. Separate doses by 2 hours.

Always tell every doctor, dentist, surgeon, anaesthetist, and pharmacist what AED you are on. Do this before any new medicine is added.

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The driving block — Austroads standards and self-reporting

Driving on AEDs is governed by the Austroads “Assessing Fitness to Drive” standards. The key points for patients:

• Private vehicle — the standard seizure-free period after a seizure is typically 6-12 months. The exact period varies. It depends on seizure type. It depends on whether warning symptoms were present. It depends on whether the seizure was provoked (for example by sleep deprivation, alcohol withdrawal, or a missed dose). It also depends on the specific epilepsy syndrome.
• Commercial vehicle (heavy vehicle, taxi, rideshare, bus) — significantly stricter. Usually 5-10 years seizure-free, depending on category.
• Self-reporting is your legal responsibility. You must report a seizure to your state or territory driver-licensing authority (VicRoads, Service NSW, Service Qld, Service WA, and so on). In most jurisdictions, your doctor’s role is to assess fitness to drive. Your doctor does not report on your behalf.
• Conditional licences are sometimes available for specific seizure types. Examples include seizures only during sleep, or seizures with consistent warning symptoms that allow safe stopping.

Driving against the Austroads standard is a real medico-legal risk for you. You can face criminal charges. You can lose insurance cover if a crash occurs. It is also dangerous for everyone on the road. Discuss your situation with your treating specialist. Confirm the current Austroads requirements before resuming driving.

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Tap any section below to expand the detail.

How do AEDs work?

Antiepileptic medicines work by quietening over-active electrical activity in the brain. Different medicines reach the same goal through different mechanisms:

• Sodium-channel blockers (lamotrigine, carbamazepine, phenytoin, oxcarbazepine, lacosamide) reduce the rapid firing of brain cells by slowing the recovery of voltage-gated sodium channels.
• Sodium valproate is a broad-spectrum agent — sodium-channel effect, GABA enhancement (the brain’s main calming neurotransmitter), and T-type calcium-channel modulation. The breadth of its mechanism is why it covers more seizure types than any other AED.
• Levetiracetam binds a unique target — SV2A (synaptic vesicle protein 2A) — modulating neurotransmitter release.
• Topiramate acts through multiple mechanisms — sodium channels, GABA enhancement, glutamate reduction, and carbonic anhydrase inhibition (which is why it can cause kidney stones, metabolic acidosis, and glaucoma).

The mechanism explains why each AED has its own personality — its spectrum (which seizure types it covers), its side-effect profile, and its drug-interaction pattern.

For mood-stabilising uses in bipolar disorder, the working theory is that the same calming effect that prevents seizures also dampens the over-active circuits that drive mania and rapid mood swings.

How the eight medicines compare — intra-class differentiation

The differences between AEDs that matter for patients are spectrum (which seizure types each covers), pharmacogenomic testing, enzyme induction vs inhibition, mood-stabiliser overlap, and pregnancy profile. Not whether one AED is “better” at controlling seizures in general — that comparison is meaningless without your specific seizure type, sex, reproductive plans, and other medicines.

Medicine	Spectrum	Mood stabiliser?	Enzyme effect	Notable safety signal
Sodium valproate	Broad (focal, generalised, absence, myoclonic)	Yes — acute mania	Inhibitor (doubles lamotrigine)	Highest pregnancy harm; hepatotoxicity (under 2s); hyperammonaemia
Lamotrigine	Broad (focal, generalised, Lennox-Gastaut)	Yes — bipolar depression	Minimal	SJS/TEN at fast titration; halved with valproate
Levetiracetam	Broad (focal, generalised, JME myoclonic)	No	Minimal	Mood and behavioural change (‘Kepprage’)
Carbamazepine	Narrow (focal, tonic-clonic)	Yes — alternative agent	Strong inducer (reduces OCP, warfarin, DOAC, statin, MHT)	HLA-B*1502 testing required; hyponatraemia
Phenytoin	Narrow (focal, tonic-clonic)	No	Strong inducer	Narrow range; gingival hyperplasia; folate depletion
Topiramate	Broad (focal, generalised)	No	Moderate inducer at higher doses	’Dopamax’; kidney stones; glaucoma; cleft palate
Oxcarbazepine	Narrow (focal only)	Off-label only	Moderate inducer at higher doses	HLA-B*1502 testing required; hyponatraemia
Lacosamide	Narrow (focal only)	No	Minimal	PR-interval prolongation on ECG

Important: do not change, swap, or stop your AED based on this comparison. Any change is a planned conversation with your treating specialist. The choice for you was deliberate.

Side effects in detail

Common across the class — usually mild, often improve with time or dose adjustment

• Drowsiness, sedation, slowed thinking — most marked in the first 2 weeks and after every dose increase. Do not drive until you know how the medicine affects you.
• Dizziness and unsteadiness — particularly important in older adults because of fall risk.
• Cognitive blunting and word-finding difficulty — worst with topiramate (‘dopamax’), phenytoin at the upper therapeutic range, and high-dose valproate. Often dose-related and often reversible on dose reduction. Tell your prescriber if foggy thinking is affecting work, study, driving, or safety.
• Mood change — irritability, anxiety, low mood. Most prominent with levetiracetam. Tell your prescriber.
• Mild gastrointestinal upset — usually settles. Take with food if needed.
• Headache — often early; usually settles.

Common with specific medicines

• Sodium valproate — weight gain, hair thinning, tremor, menstrual irregularity (in some women); rare but serious hepatotoxicity (especially children under 2), pancreatitis, hyperammonaemic encephalopathy (worse when combined with topiramate), thrombocytopenia.
• Lamotrigine — SJS/TEN at fast titration (see the rash block above); generally well-tolerated long term.
• Levetiracetam — mood and behavioural effects (irritability, anxiety, low mood, sometimes aggression — colloquially ‘Kepprage’); typically first weeks; pyridoxine B6 sometimes used to soften.
• Carbamazepine — hyponatraemia (especially older adults), DRESS, aplastic anaemia (rare), agranulocytosis (rare), drug-interaction load.
• Phenytoin — gingival hyperplasia (gum overgrowth — meticulous dental hygiene + 6-monthly dental review), hirsutism, coarsening facial features, folate depletion, peripheral neuropathy, cerebellar atrophy at chronic high levels.
• Topiramate — kidney stones (1-2% — hydration essential, especially in warm climates and during exercise), metabolic acidosis (low bicarbonate — check baseline), word-finding difficulty, weight LOSS (the opposite of valproate), paraesthesia in fingers and toes, RARE acute angle-closure glaucoma.
• Oxcarbazepine — hyponatraemia (10-25% — sodium check at baseline, at 1 month, and any time symptoms appear); SJS/TEN signal at HLA-B*1502 (testing as above).
• Lacosamide — PR-interval prolongation on ECG (baseline ECG before starting if known conduction disease or other PR-prolonging agents); dizziness, headache, diplopia, nausea (dose-related).

Rare but serious — act quickly

• New rash + fever + mouth or eye involvement + blistering or skin peeling — stop the medicine; emergency department if widespread, same-day GP if early. SJS, TEN, or DRESS.
• New or worsening thoughts of self-harm or suicide — tell your prescriber immediately. Lifeline 13 11 14. Call 000 if safety is at risk right now.
• Sudden eye pain, blurred vision, halos around lights, headache on topiramate — stop the medicine and seek urgent ophthalmology. Acute angle-closure glaucoma.
• Unexplained severe abdominal pain on valproate — pancreatitis. Urgent assessment.
• Confusion, drowsiness, vomiting on valproate (especially with topiramate combination) — hyperammonaemic encephalopathy. Urgent assessment.
• Easy bruising, bleeding gums, petechiae on valproate — thrombocytopenia. Same-day blood test.
• Marked tiredness, headache, nausea, confusion on oxcarbazepine or carbamazepine — hyponatraemia. Same-day blood test.

Monitoring — what blood tests and when

What needs checking depends on which AED you take and how long you have been on it.

For all AEDs

• Mood and suicidality screening at every review.
• Seizure control review with your specialist on the specialist’s schedule (typically 3-6 monthly at start, then less often as stable).
• Driving discussion at every review and after any seizure.

Sodium valproate

• Liver function at baseline and as clinically indicated (especially first 6 months; not routine annual screen in stable adults).
• Full blood count for platelets if bruising, bleeding gums, or unexplained tiredness.
• Ammonia level if confusion, drowsiness, vomiting (especially when combined with topiramate).
• Pregnancy Prevention Programme annual review for any female of reproductive potential.

Lamotrigine

• No routine blood-test monitoring in stable users. Levels are sometimes checked at specialist discretion.

Levetiracetam

• Kidney function at baseline and annually (renally cleared; dose reduction needed in reduced kidney function).

Carbamazepine and oxcarbazepine

• Sodium at baseline, at 1 month, and any time tiredness, headache, nausea, confusion, or falls suggest hyponatraemia.
• Full blood count at baseline and periodically (carbamazepine — rare aplastic anaemia signal).
• Carbamazepine level sometimes used at specialist discretion.

Phenytoin

• Phenytoin level — therapeutic drug monitoring is standard, given the narrow therapeutic range.
• Folate if megaloblastic anaemia, fatigue, or planning pregnancy.
• Vitamin D + DEXA scan for bone density (more frequent than the class baseline).

Topiramate

• Bicarbonate at baseline (metabolic acidosis screen).
• Same-day ophthalmology for any new eye pain, blurred vision, or halos (rare acute angle-closure glaucoma).

Lacosamide

• ECG at baseline if known cardiac conduction disease or on other PR-prolonging agents.
• Kidney function at baseline and annually.

All AEDs after 5 years of use

• Vitamin D check; supplement to 75-100 nmol/L target.
• DEXA scan every 2-3 years for bone density, or sooner with other osteoporosis risk factors.

Tell your GP if you start any new medicine (prescription, over-the-counter, or supplement), notice a change in mood, have a near-miss or a fall, or notice any of the red-flag symptoms above.

Stopping or pausing — the taper

Never stop an AED suddenly. Abrupt cessation can trigger:

• Breakthrough seizures (in epilepsy use) — sometimes status epilepticus.
• Rebound mood episodes (in bipolar use) — sometimes severe.
• Withdrawal symptoms (anxiety, insomnia, nausea, restlessness).

Any taper is specialist-guided and slow — typically months, not weeks. The decision to attempt cessation is made by the treating neurologist or psychiatrist based on seizure-free interval, type of epilepsy, EEG pattern, and the individual risk picture.

If you have run out of medicine, missed multiple doses, or want to come off, contact your prescriber the same day. Do not let prescriptions lapse. Order repeats at least a week before you run out.

Sick day rules — if vomiting prevents you keeping the medicine down, contact your GP or specialist for a bridging plan. For some AEDs an IV or rectal alternative is available for short-term cover.

Surgery or general anaesthetic — tell the anaesthetist and surgeon in advance that you are on an AED. Most are continued through surgery; some are given parenterally if you cannot take oral medicine for a period.

The taper conversation is a planned appointment, not an improvised one.

The integrative view — nutrition, sleep, and the broader plan

The AED is one lever. The strongest epilepsy and mood-stability plans use several together — medicine, sleep, nutrition, stress regulation, and where appropriate movement and mind-body work. The integrative angle does not replace the AED. It supports the body that is doing the work.

Two principles. First: AEDs work, they are reasonable to use, and for many people they are non-negotiable. Second: AEDs have predictable side-effect and nutrient-depletion patterns, and addressing those patterns improves quality of life and long-term health.

Strong evidence — these reliably matter

• Sleep optimisation. Sleep deprivation is a well-established seizure trigger. Consistent sleep timing within 1 hour each night, 7-9 hours total, dark cool bedroom, screen taper before bed, and treatment of obstructive sleep apnoea where suspected.
• Alcohol moderation. Additive sedation with AEDs. Binge drinking followed by abstinence lowers the seizure threshold during withdrawal. Adds hepatic load with valproate. Safest is abstinence in the first 6-12 months after a seizure; moderate intake (around 1 standard drink most days at most) may be acceptable in stable epilepsy — discuss with your specialist.
• Vitamin D 75-100 nmol/L target. Bone density loss is a class-level concern after years of AED use, particularly with enzyme-inducer AEDs (carbamazepine, phenytoin). Calcium 1000-1200 mg/day from diet first (dairy, sardines, leafy greens, fortified soy or almond), supplement to target if blood test shows deficiency.
• Folate 5 mg/day pre-conception for any female of reproductive potential on an enzyme-inducer AED — for at least 3 months before conception and through the first trimester.
• Stress regulation. Chronic stress lowers seizure threshold. MBSR, ACT, and structured CBT all have evidence in chronic conditions. Vagal-tone work (slow nasal breathing at around 6 breaths per minute, cold-water face immersion) supports general nervous-system stability.

Moderate evidence — likely helpful

• B-complex (B1 / B6 / B12). Particularly relevant on enzyme-inducer AEDs. Phenytoin depletes folate. Pyridoxine (B6) 50-100 mg/day is sometimes used as an adjunct to soften levetiracetam-related irritability — discuss with your specialist before adding. Avoid very high-dose B6 long term (can itself cause peripheral neuropathy).
• Omega-3 (EPA + DHA), 1-2 g/day. General anti-inflammatory and brain-health support. Not a seizure-control claim.
• Magnesium. Adequacy supports neuronal stability and bone health. Food-first (leafy greens, nuts, seeds, whole grains, legumes).
• L-carnitine 1-3 g/day — specialist consideration in valproate users with fatigue, weight gain, or hyperammonaemia. Valproate inhibits hepatic carnitine biosynthesis. Discuss with your neurologist before starting — not self-medication.
• Graded movement. Consistent gentle exercise supports mood, sleep, bone density, and weight management on AEDs (particularly valproate, which causes weight gain). Build slowly. Avoid swimming alone or high-risk solo activities until seizure control is established.

Limited or emerging evidence

• Ketogenic diet (medical-grade, not general low-carb). Specialist epilepsy-clinic territory for selected treatment-resistant epilepsy, particularly in children. Requires a credentialled dietitian and specialist supervision; not a self-trial — particularly on valproate or topiramate (metabolic-acidosis considerations).
• Gluten-elimination trial. Reasonable in selected drug-resistant epilepsy with positive coeliac antibodies (anti-tTG, anti-EMA) or biopsy-confirmed coeliac disease. Specialist territory.
• Magnesium supplements specifically for seizure control. Limited evidence in non-deficient adults. Food-first.

Avoid or use with care

• Grapefruit and grapefruit juice — raises carbamazepine levels (CYP3A4 inhibition). Switch to other citrus.
• St John’s wort (hypericum) — strong enzyme inducer; reduces AED levels; can trigger breakthrough seizures. Avoid on any AED.
• Other herbal supplements — many are unstudied in combination with AEDs. Discuss with your prescriber before starting any herbal product.
• Tramadol, tapentadol, and high-dose codeine — lower the seizure threshold. Discuss with your prescriber for pain relief alternatives.

Specific to being on an AED

• Pregnancy planning for any female of reproductive potential — see the pregnancy block above. Specialist pre-conception review.
• Bone-density work after 5 years on an AED — vitamin D, calcium, weight-bearing exercise, DEXA scan.
• Dental review 6-monthly on phenytoin — gingival hyperplasia is preventable with meticulous hygiene.
• Driving and machinery — do not drive until you know how the medicine affects you, and follow the Austroads standard for seizure-free intervals.
• Carry medical identification that names your AED and your specialist.

Pregnancy and breastfeeding — the longer version

The pregnancy block above covers the headline message. This section expands.

The framing principle. For most people of reproductive potential on an AED, the planning conversation is started before trying to conceive — typically a dedicated specialist appointment 3-6 months before. Last-minute medicine swaps in early pregnancy are higher-risk than planned transitions, because every AED switch carries the risk of breakthrough seizures during the changeover.

Sodium valproate. Highest pregnancy harm (see above). The TGA-endorsed Pregnancy Prevention Programme is mandatory. Where seizure type and individual control permit, transition to lamotrigine or levetiracetam is usually attempted pre-conception. If valproate is genuinely the only AED that controls seizures, the conversation becomes about minimising the dose, splitting the dose (to reduce peak levels), and detailed obstetric and paediatric follow-up.

Topiramate. Cleft lip and palate signal. Pre-conception specialist review essential. Migraine-prevention use in particular has lower-risk alternatives.

Carbamazepine and phenytoin. Known teratogenicity (neural-tube defects, fetal hydantoin syndrome). High-dose folate (5 mg/day) for 3 months pre-conception and through first trimester. Pre-conception specialist review.

Lamotrigine and levetiracetam. Generally the pregnancy-safer AED options where seizure type permits. Lamotrigine levels fall significantly during pregnancy (often by half), so the dose is increased during pregnancy and reduced again after delivery to avoid maternal toxicity once placental clearance ends.

Oxcarbazepine and lacosamide. Less pregnancy-exposure data than older AEDs. Specialist call.

Breastfeeding. Most AEDs transfer into breast milk in small to moderate amounts. The decision to continue or switch is made case by case, weighing the infant exposure against the benefits of breastfeeding and the maternal seizure-control picture. Many women breastfeed safely while on an AED under monitoring. Watch for excessive sleepiness, poor feeding, or unusual irritability in the infant — discuss with your specialist and your child’s paediatrician.

Contraception while on enzyme-inducer AEDs. The combined OCP and progestogen-only pill are less reliable. A copper IUD or hormonal IUD (Mirena, Kyleena) is the most reliable option and is not affected by enzyme induction. The contraceptive injection is an alternative. Condoms as a non-hormonal back-up to the pill are reasonable if the pill is being continued for other reasons.

Cost

All eight medicines on this page are listed on the PBS for their on-label indications. From 1 January 2026, the PBS co-payment is:

• General patient — up to $25.00 per script.
• Concession card holder — up to $7.70 per script.

Authority requirements. Most AEDs require PBS Authority — either Streamlined Authority or Authority Required — for the epilepsy indication. The exact requirements vary by AED, by indication, and by line of therapy. Your prescriber arranges the Authority. Lacosamide historically has had a more restrictive Authority listing; confirm with your pharmacist at the time you fill the script.

Generic versions cost the same as brand-name versions at PBS pricing and work the same — the active drug, the strength, and the dosing are identical. The pharmacist may offer a generic; it is fine to take.

If a particular brand has worked well for you (this matters most with phenytoin and carbamazepine, where small bioavailability differences between brands can affect blood levels), tell the pharmacist you prefer to stay on the same brand. PBS rules allow for “brand-substitution-not-permitted” prescriptions where clinically indicated.

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The 7-day starter map — what to track between now and your next visit

The first month on a new AED (or a dose change) is the highest-yield observation window. Bring the answers to your next review.

• Seizures or mood episodes — what, when, how long, what was happening just before. A simple paper diary or phone notes is enough.
• Sleep — quality, hours, any consistent disruption.
• Drowsiness, dizziness, or unsteadiness — when in the day, how marked, any near-misses or falls.
• Mood — note any change, particularly any new low or any thought of self-harm. If safety is at risk, contact Lifeline 13 11 14 or call 000.
• Skin — any new rash, particularly in the first 8 weeks. Photograph if it appears, and contact your prescriber the same day if combined with fever, mouth involvement, or blistering.
• For valproate users — weight, hair, energy. For phenytoin users — gums. For topiramate users — fingers and toes, vision, hydration. For oxcarbazepine and carbamazepine users — energy, headache, any sense of confusion.
• For females of reproductive potential — any change in cycle pattern, any contraception issue.
• Anything new you have started — over-the-counter medicines, supplements, alcohol changes, other prescribers’ prescriptions.

Bring the list to your review appointment.

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This is general information, not personal medical advice. Every patient is different. Decisions about your medicines — which one, what dose, when to stop, what to combine with — are made with the doctor who prescribed them. If anything on this page appears to contradict advice from your treating specialist, follow your specialist; they have context about your situation that this page cannot.

Reading this page does not establish a doctor-patient relationship with Dr Hoebing Lo. If you are not a current patient, please discuss your medicines with your own GP, treating specialist, or pharmacist.

About the integrative content. The lifestyle, dietary, and complementary recommendations on this page summarise current published research. Effect sizes are approximations from clinical studies — your individual response will vary, and real-world results are commonly smaller than trial results because day-to-day life differs from study conditions. Supplements and herbal products are not interchangeable with prescribed medication and can interact with it. Talk to your specialist and pharmacist before starting any new supplement, herbal product, or significant change in diet — particularly on an AED, where interactions can trigger breakthrough seizures.

Currency. This page reflects clinical practice as of the last-reviewed date. Medicine evolves; specific details may date between reviews. Pricing shown is indicative; confirm with your pharmacist. The TGA-endorsed Valproate Pregnancy Prevention Programme, Austroads driving standards, HLA-B*1502 testing recommendations, and PBS Authority criteria evolve over time — confirm current wording with your prescriber.

No commercial relationships. Dr Hoebing Lo has no financial or commercial relationship with the manufacturer of any medicine, brand, or supplement mentioned on this page.

Emergencies. A seizure lasting over 5 minutes, repeated seizures without recovery in between, a first-ever seizure, breathing difficulty, marked drowsiness with slow breathing, sudden swelling of face or throat, widespread rash with fever, sudden eye pain with vision change, severe abdominal pain on valproate, or thoughts of suicide or self-harm — call 000 or go to your nearest emergency department. For mental-health crisis support, Lifeline 13 11 14 is available 24 hours.