My daughter takes vimpat, she has been for about 2 years now. The only side effect I know she had was dizziness.

I tried it for about 6 weeks but it reacted badly with one of my other medications. It's spelt Vimpat but I knew whatcha meant :)
Vimpat is a sodium based drug as is lamictal and that can either be a good thing or a bad thing. Meaning it was going to work really well or completely and totally fail for me. It failed, thanks doc.
I didn't notice any side effects until about 2 weeks after taking it (about the time I increased the dose) and that's when I started to get awful vertigo. To the point I couldn't get through classes and had to go to the nurse's office.
Please keep in mind that I am not a doctor and that I am not a doctor and each drug is different for each person.

I was put on vimpat last year and was on it for only a few months before I was taken off of it, it worked great for the few months I was on it the only side effect I experienced was cystic acne and it was horrible. I looked like I was 13 again and just hit puberty!