LAMICTAL XR vs SESQUIENT

Independent side-by-side comparison.

Rated against independent regulatory sources·Last updated August 11, 2026·How we rate

Possible drug interaction. LAMICTAL XR and SESQUIENT are different prescription medicines. Combining or switching between them can cause interactions — talk to a pharmacist or prescriber before making changes. This page is not medical advice.

Attribute	LAMICTAL XR	SESQUIENT
Rating	New	64/100
Pharmacy pays	~$4.39 /30	—
Type	RX	RX
Active ingredient	LAMOTRIGINE	FOSPHENYTOIN SODIUM
Manufacturer	Smithkline Beecham	Lupin
Dosage forms	Tablet, extended release, Kit	Solution
Drug class	Anti-Epileptic Agent	Anti-Epileptic Agent
Boxed warning	None	None
Half-life	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	—
Treats	Bipolar Disorder, Partial Epilepsies, Seizures	Seizures, Status Epilepticus

lamictal xr sesquient

Rating

New

64/100

Pharmacy pays

~$4.39 /30

—

Type

Active ingredient

LAMOTRIGINE

FOSPHENYTOIN SODIUM

Manufacturer

Smithkline Beecham

Lupin

Dosage forms

Tablet, extended release, Kit

Solution

Drug class

Anti-Epileptic Agent

Boxed warning

None

Half-life

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

—

Treats

Bipolar Disorder, Partial Epilepsies, Seizures

Seizures, Status Epilepticus

Frequently asked questions

What is the difference between Lamictal XR and Sesquient?

Lamictal XR contains Lamotrigine, while Sesquient contains Fosphenytoin Sodium — they have different active ingredients.

Ratings are based on FDA regulatory (recall-safety) data. This comparison is for general reference only — not medical advice. Always consult a licensed professional before choosing or switching a medication.