Can lamotrigine cause a rash after being on it a year or so?

Uncommon, but maybe: Lamotrigine (lamictal) can (rarely) cause serious, even life-threatening, rashes, but these usually occur within 2 to 8 weeks of starting treatment, but very rarely can occur later. Risk of serious (eg stevens johnson syndrome) is roughly 0.8% in kids and 0.3% in adults. If you develop a rash while taking Lamotrigine you should see a doctor to see if the rash can be attributed to something else.

Drug reactions: While most medication reactions will occur fairly early in the course of treatment an allergic reaction can happen at any point in therapy. Any suspicious reaction should be evaluated.

Lamotrigine rash: Apparently most rashes associated with this drug occur within 2 - 8 weeks after starting it. (note these rashes may be life-threatening: stevens-johnson-syndrome/toxic epidermal necrolysis and drug reaction with eosinophilia and systemic symptoms (dress)). One source states that stopping the drug at any point & restarting at the same dose can trigger a rash. So, it's possible, even after a year.

YES, STOP NOW.: Lamotrigine (brand lamictal) is used for certain seizure disorders, bipolar disease, part of pain management and other off-label uses. You can develop a rash any time after starting the drug. And it can be very serious, even a life-threatening disease called steven-johnson syndrome. Always call your physician or the specialist who prescribed a drug that u think ur getting a rash from.