Lamotrigine is one of the cheapest prescriptions in America and one of the most expensive, depending entirely on which version of it the label says. Medicare Part D covered 4.15 million ordinary lamotrigine claims for 639,247 people in 2024 at an average of $14.25 each. In the same year it paid $1,262.88 per claim for the green generic starter dose pack and $3,123.97 per claim for brand Lamictal XR.
Same molecule, same pharmacies. The difference is form and packaging, not milligrams. If you searched for Lamictal and landed here, the brand costs 30 to 70 times the generic tablet. Every figure was researched on September 4, 2026.
What Does Lamotrigine Cost Without Insurance?
Acquisition costs come from the CMS National Average Drug Acquisition Cost survey, which is what a pharmacy pays a wholesaler and never what a patient pays at the counter. Every generic and brand row cited here is effective August 19, 2026, with one exception noted later. Cash prices come from Drugs.com and Cost Plus Drugs, both read September 4, 2026. The middle column shows a mid-range example, not a computed average.
| Option | Low | Average | High |
|---|---|---|---|
| Generic tablets, 30-day supply | $6.31 (Cost Plus, 100 mg) | $9.00 (Walmart program) | $10.80 (Drugs.com, 100 mg) |
| CMS NADAC acquisition cost, one generic tablet | $0.02705 (25 mg) | $0.04874 (100 mg) | $0.08404 (200 mg) |
| Generic chewable dispersible, 100 tablets | $31.44 (5 mg) | $33.84 (25 mg) | $33.84 (25 mg) |
| Generic orally disintegrating, 30 tablets | $95.57 (50 mg) | $101.95 (100 mg) | $119.51 (200 mg) |
| Generic extended-release, 30 tablets | $45.76 (25 mg) | $52.54 (200 mg) | $74.19 (300 mg) |
| Generic starter dose pack, one pack | $502.70 (blue, 35 tablets) | $728.10 (orange, 49) | $1,393.80 (green, 98) |
| Brand Lamictal starter dose pack, one pack | $323.54 (blue, 35 tablets) | $435.45 (orange, 49) | $816.34 (green, 98) |
| Generic ODT starter kit, 35 tablets (Cost Plus) | $261.93 | $261.93 | $710.00 (retail Cost Plus cites) |
| Brand Lamictal tablets | $711.64 (150 mg, 60) | $1,056.89 (25 mg, 100) | $1,123.78 (100 mg, 100) |
| Brand Lamictal XR, 30 tablets | $443.15 (25 mg) | $1,002.12 (200 mg) | $1,499.26 (300 mg) |
| Medicare Part D average per claim, 2024 | $14.25 (generic tablets) | $262.50 (generic ER) | $3,123.97 (Lamictal XR) |
The cheap end is about as settled as retail drug pricing gets. Cost Plus Drugs listed 30 of the 100 mg tablets at $6.31 and said other pharmacies charge $41.10 for the same bottle. Drugs.com listed $10.80 for 30. Walmart’s program charges $9 flat. Three reads inside a $5 band, against a pharmacy acquisition cost of $1.46 for those 30 tablets.
Everything above that line is a packaging decision. The 100 mg tablet costs a pharmacy 4.9 cents; the 100 mg orally disintegrating version of the same 100 mg costs $1.79896, which is 37 times more. Extended-release at 100 mg costs $0.62186, about 13 times more. That is the actual subject of this page.
What Drives the Price
Which of the five forms it is. Lamotrigine is sold as a plain tablet, a chewable dispersible tablet, an orally disintegrating tablet, an extended-release tablet and a pre-packaged dose pack, and CMS carries each as its own separate acquisition-cost row. At 25 mg, one plain tablet costs a pharmacy $0.02705, one chewable dispersible costs $0.14973, one orally disintegrating tablet costs $1.26684 and one tablet inside an orange starter kit costs $9.47558. That is a 350-fold range within a single milligram strength.
Starter packs, which are the biggest single bill most people meet. The three generic dose packs listed at $502.70, $728.10 and $1,393.80 on Drugs.com work out to $14.22 to $14.86 per tablet, against roughly 15 to 36 cents for the same molecule in a bottle. Medicare Part D’s 2024 data corroborates this from a completely different direction, paying $505.56, $652.49 and $1,262.88 per claim for those same three packs. Two sources, two years apart, agreeing on a 40-fold to 90-fold premium for packaging. The packs exist because the starting schedule is a prescriber’s call, so the useful move is to ask about the cost before the prescription is written, not after it is filled.
The generic starter pack costs more than the brand one. Drugs.com priced the brand Lamictal orange pack at $435.45 for 49 tablets and the generic orange pack at $728.10 for the same 49. The blue packs are $323.54 brand against $502.70 generic, and the green packs are $816.34 against $1,393.80. Part D shows the same inversion in 2024, at $415.15 per Lamictal (Orange) claim against $652.49 per generic. If a pack is what you are filling, it is genuinely worth asking the pharmacy to price both.
Strengths that no longer exist. FDA’s Drugs@FDA record for NDA 020241 lists the brand Lamictal 50 mg and 250 mg plain tablets as discontinued, with a Federal Register determination that neither was withdrawn for safety or effectiveness reasons, while the 25, 100, 150 and 200 mg stay on the market. The 100 mg chewable dispersible is discontinued too. CMS carries no generic acquisition-cost row for any of those three, which is exactly what an absent reference product looks like from the pricing side.
The one stale figure on this page. Every CMS row quoted above is effective August 19, 2026 except one. The plain-tablet orange starter kit was last priced in the February 11, 2026 file at $14.39490 per tablet, effective February 19, 2025, and has since dropped out of the survey, leaving the orally disintegrating kit at $9.47558 as the only current CMS kit row. That retired figure still matches the $14.86 per tablet Drugs.com charges for the generic orange pack today.
Prices that do not rise with dose. Three rows break the pattern you would expect and are worth naming rather than smoothing over. The 200 mg orally disintegrating tablet costs a pharmacy $1.46569 against $1.79896 for the 100 mg. The 200 mg extended-release tablet costs $0.61803 against $0.62186 for the 100 mg. And the 5 mg chewable costs $0.16123 against $0.14973 for the 25 mg. Thin supply, not dose, is setting those prices, so a higher strength is not reliably a higher bill.
Brand versus generic on the ordinary tablet. Brand Lamictal costs a pharmacy $10.29023 to $12.05753 per tablet against $0.02705 to $0.08404 for the generic. Drugs.com listed 100 brand 25 mg tablets at $1,056.89 against $15.02 for 100 generic, and Part D paid $1,381.73 per Lamictal claim in 2024 against $14.25 per generic claim.
Cash Price vs. Insurance
For ordinary lamotrigine tablets this is one of the clearest cash-beats-copay cases on the site. A $6.31 mail-order price or a $9 Walmart program price undercuts most generic copays outright and never touches your pharmacy benefit. Our Seroquel cost guide and gabapentin cost guide reach the same conclusion for the same reason.
The standard tradeoff applies. Money spent outside a plan does not count toward a deductible or an out-of-pocket maximum, and a discount card cannot be combined with insurance on the same fill. On a $9 prescription that lost credit rarely matters.
It matters completely on the expensive presentations. A $1,499.26 fill of brand Lamictal XR or a $1,393.80 starter pack is exactly the kind of charge you want counting toward a deductible, and exactly the kind that gets denied first. Extended-release and orally disintegrating forms are common prior-authorization targets precisely because a much cheaper form of the same molecule exists, which is a billing argument rather than a clinical one.
If a pharmacy quotes you a three-figure number for something the label calls a tablet, run it through our fair price checker before you pay, and check the form on the label first.
How to Pay Less
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Read the form on the prescription before you price anything. Plain tablet, chewable dispersible, ODT, XR and dose pack are five different products at five different prices, and a pharmacy quote that looks absurd is usually a correct price for a form you did not realise you were filling. Which form is appropriate is a prescriber question, so raise the cost at the visit rather than changing anything at the counter.
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Use Walmart’s prescription program, and know it is not the $4 tier. Walmart’s drug list, effective March 24, 2025 and read September 4, 2026, puts lamotrigine in the $9 per 30 days and $24 per 90 days tier under Mental Health. The 100 mg and 200 mg are covered at 30 tablets per 30 days and the 25 mg and 150 mg at 60 tablets per 30 days, which reflects twice-daily quantities. Extended-release, ODT, chewable and starter packs are not on the list at any tier, so this only helps for ordinary tablets.
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Price the mail-order pharmacies, especially for the expensive forms. Cost Plus Drugs listed 30 of the 100 mg tablets at $6.31 against the $41.10 it says other pharmacies charge, and a 35-tablet generic orally disintegrating starter kit at $261.93 against the $710.00 it cites elsewhere. Those listed prices already include a $5 pharmacy fee, and Cost Plus states that your final cost will also include shipping and taxes, which vary by location, so budget a few dollars more rather than a fixed amount.
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Run a free discount card before every fill. The spread between a card price and an unhelped counter price is wider on this drug than any decision except the form itself, and card prices move. Our comparison of GoodRx vs. SingleCare explains how to price the same prescription both ways and why an online quote can shift between visits.
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Ask GSK about the brand versions specifically. The GSK Patient Access Programs Foundation lists Lamictal chewable dispersible tablets, Lamictal orally disintegrating tablets, Lamictal starter kits, Lamictal ODT patient titration kits and Lamictal XR among its covered products, and provides them at no cost to patients who meet its financial criteria, are uninsured or on Medicare, live in the United States or Puerto Rico and are treated by a US-licensed provider. The foundation does not publish an income cutoff, so the application is the only way to find out. This is the single most useful call available to anyone facing a four-figure Lamictal XR bill.
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Budget for the prescriber visit, not just the pills. Lamotrigine requires an ongoing prescribing relationship and regular follow-up, and on the generic tablet the appointment costs many times the medication. Our psychiatrist cost guide covers what those visits run, a free or sliding-scale clinic can often handle refills at little or no cost, and our Latuda cost guide and antidepressant cost guide cover the neighbouring prescriptions people are frequently filling at the same time.
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If a four-figure pharmacy bill has already landed, treat it as negotiable. A $1,393.80 charge for a titration pack is the kind of line item that gets reviewed on request. Our guide to negotiating medical bills covers the call and our itemized bill guide covers what to ask for first.
Bottom Line
Budget $6 to $11 a month for ordinary generic lamotrigine tablets, or $9 flat at Walmart, or $24 for 90 days if you fill long. Anything above roughly $40 for plain tablets is a reason to shop rather than a fact about the drug.
Everything else on this molecule is a packaging premium: $31 to $34 per 100 chewable dispersible tablets, $46 to $74 per 30 extended-release, $96 to $120 per 30 orally disintegrating, $503 to $1,394 for a single generic starter dose pack, and $443 to $1,499 per 30 for brand Lamictal XR. The two moves that actually change those numbers are asking the prescriber about the form before the prescription is written, and applying to GSK’s foundation if the brand is what you need. A different pharmacy will not close a 40-fold gap.