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Hi, I am an American Board Certified Neurologist; the expert to whom this question was originally addressed is not available now so the company has made this question available to other experts too and I am very glad to help you with your health concerns.
Coming to the discussion;
12.5 mg of lamictal is not at all going to help as an anticonvulsant. You will require much higher dose than that for it to become effective against seizures. I see that higher dose of lamictal causes bad side effect in you so you cannot go back to the higher dose again. So this essentially means either avoid being on any seizure meds or use another seizure med in place of lamictal. It is true lamictal is among the seizure meds with lowest sedative side effect so when you use some other seizure med there is still a chance of developing sedation however individual responses may vary so you may not develop as severe sedation as you had with lamictal with some other seizure med. Other effective seizure meds with overall not too high sedative property include Topiramate, Levetiracetam, Oxcarbazepine etc.
Once again to your main question, no, lamictal at 12.5 mg is not going to be of any help as an anticonvulsant; so your options are either to switch to another seizure med or being off any seizure med.
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