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Real Life Pharmacology - Pharmacology Education for Health Care Professionals

Lamotrigine Pharmacology

Real Life Pharmacology - Pharmacology Education for Health Care Professionals

Eric Christianson, PharmD; Pharmacology Expert and Clinical Pharmacist

Education, Health & Fitness, Medicine

5716 Ratings

🗓️ 29 October 2020

⏱️ 12 minutes

🧾️ Download transcript

Summary

On this episode of the Real Life Pharmacology podcast, I discuss the ins and outs of lamotrigine pharmacology.



Lamotrigine has a very slow dose titration schedule due to the risk of drug induced rash.



Sedation, GI upset, and CNS changes are the most common adverse effects associated with lamotrigine.



Lamotrigine concentrations can be increased by valproic acid, so we tend to use lower starting doses.



Phenytoin and carbamazepine can lower concentrations of lamotrigine.

Transcript

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0:00.0

Hey all, welcome back to the Real Life Pharmacology podcast.

0:04.0

I'm your host, Eric Christensen, pharmacist, board certified in pharmacotherapy and geriatrics.

0:10.3

Thanks so much for listening today.

0:12.5

You can track me down at LinkedIn and connect me there.

0:15.4

That's probably the easiest way to do it.

0:17.2

I'm fairly active there, as well as email me at Med Education 101 at gmail.com.

0:25.5

If you have any suggestions, comments, anything like that, definitely don't hesitate to reach out like

0:32.4

the gentleman that did it the other day, and he suggested I do the podcast on Lomotrogyne, which is

0:40.7

definitely a medication I see in clinical practice from time to time. So this drug is classified

0:49.8

primarily probably as an anticonvulsant. I would say the two most common indications I see it

0:57.9

used for are seizures or anti-convulsant activity there. The other one is in bipolar disorder

1:06.8

and particularly probably more common in bipolar depression in those type of patients.

1:14.9

Mechanistically, how does this medication work?

1:18.7

Okay, Lamotrogen or Lamictal by brand name works primarily by blocking glutamate release in the central nervous

1:27.3

system. And if you remember glutamate and what it does in the central nervous system.

1:28.3

And if you remember glutamate and what it does in the CNS, it's actually an excitatory

1:33.3

neurotransmitter, which makes a lot of sense if we're going to block something, we'd want to, and prevent seizures, for example,

1:41.3

we'd want to block an excitatory neurotransmitter,

1:45.2

which might increase the risk for seizures.

1:48.3

So ultimately, what Lomotrogen does from a 30,000-foot view is it really kind of settles down

1:57.0

or calms down the central nervous system.

2:04.1

So again, those indications, seizures, bipolar disorder, rarely. I have seen it used in headache prophylaxis, but that's an off-label use,

...

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