lamictal xr

How long does Lamotrigine stay in your body?

The elimination half-life of lamotrigine is about 25 to 33 hours in healthy adults taking no other medications — the label reports a mean elimination half-life of 32.8 hours after a single dose (individual range 14 to 103 hours) and 25.4 hours with repeat dosing (range 11.6 to 61.6 hours), since lamotrigine induces its own metabolism — the time it takes the body to clear about half of it. As a rule of thumb, a medicine is mostly gone after roughly 4 to 5 half-lives, though this varies from person to person with age and kidney or liver function. These are the terminal (elimination) half-life values from Table 14 of the label; lamotrigine is not a prodrug and has no active metabolite that outlasts it — the label states the major metabolite, the 2-N-glucuronide, is inactive. The half-life shifts a lot with other drugs and with organ function. Other seizure medicines that induce liver enzymes (carbamazepine, phenytoin, phenobarbital, primidone) shorten it to roughly 13 to 14 hours, while valproate roughly doubles it (about 48 hours single-dose, about 70 hours with repeat dosing in healthy volunteers); lopinavir/ritonavir cuts it by roughly half. Older adults: essentially unchanged — mean 31.2 hours (range 24.5 to 43.4) in volunteers aged 65 to 76. Kidney impairment: prolonged — mean 42.9 hours in chronic renal failure and 57.4 hours between hemodialysis sessions, versus 26.2 hours in the healthy controls in that same study (13 hours during a dialysis session, which removes about 20% of drug in the body over 4 hours). Liver impairment: markedly prolonged — mean half-life 46 hours (mild), 72 hours (moderate), 67 hours (severe without ascites) and 100 hours (severe with ascites). This is pharmacokinetic information, not dosing guidance and not a drug-test detection window.

This is general information, not medical advice. It doesn’t tell you when a drug test would read negative (tests detect substances for different, often longer, windows) or when it’s safe to take another dose — ask your pharmacist or prescriber. Source: Lamotrigine tablet — FDA label (DailyMed SPL, Par Health USA, LLC), Section 12.3 Pharmacokinetics.

Frequently asked questions

What does Lamictal XR treat?

Lamictal XR (Lamotrigine) may be used to treat bipolar disorder, partial epilepsies, seizures, lennox gastaut syndrome, based on NIH RxClass drug-classification data (conditions a drug may treat — not a verbatim copy of the FDA-approved label). This is general reference, not medical advice.

How does Lamictal XR work?

Lamictal XR is a anti-epileptic agent. Anti-epileptic (anticonvulsant) drugs calm the abnormal, excessive electrical activity that triggers seizures. They do this by stabilizing overactive sodium or calcium channels in nerve cells, boosting the brain's natural calming chemical GABA, or dampening excitatory signals, which makes nerves less likely to fire uncontrollably.

How much does Lamictal XR cost?

Nobody can tell you what you will pay — your price is set by your insurer's formulary, your deductible and the pharmacy's markup, and none of those are published. What IS published is what the pharmacy paid to acquire it: about $4.39 for 30, per the CMS NADAC survey. Treat that as the floor, not the quote — ask the pharmacist for the cash price as well as your copay, because for cheap generics the cash price often wins.

Is there a coupon or discount for Lamictal XR?

pharmaranks is an independent ratings site, not a pharmacy — we don't issue coupons or sell Lamictal XR. To pay less, ask your prescriber or pharmacist whether a generic equivalent exists, check the manufacturer's copay/savings card and patient-assistance program, and compare a pharmacy discount card against your insurance copay. Prices vary by pharmacy, insurance, and location, so always confirm at the counter. This is general reference, not medical or financial advice.

Who makes Lamictal XR?

Lamictal XR is marketed by Smithkline Beecham. You can see Smithkline Beecham's full profile, rating, and other products on pharmaranks.

Is Lamictal XR a brand-name or generic drug?

Lamictal XR is a brand-name product with the active ingredient Lamotrigine. Lower-cost generic equivalents containing Lamotrigine are available — ask your pharmacist.

Is Lamictal XR available over the counter?

No. Lamictal XR is a prescription (Rx) medication in the US — you need a prescription from a licensed clinician (in person or via telehealth); it isn't sold over the counter. For some conditions there are OTC alternatives — ask your pharmacist.

What forms does Lamictal XR come in?

Lamictal XR is currently marketed as tablet, extended release and kit, per the FDA's National Drug Code Directory.

What class of drug is Lamictal XR?

Lamictal XR is classified as anti-epileptic agent, mood stabilizer, per the FDA's Established Pharmacologic Class.

Is Lamictal XR FDA-registered?

Lamictal XR is on record with the U.S. FDA under application number NDA022509. You can verify this on its official FDA label.