How do different brands of the same drug differ? in Anticonvulsants / Mood Stabilizers - Bodies A-Twitchin', Moods A-Switchin' Posted Friday at 11:14 AM So I think a branding change happened here right before I started taking lamotrigine. I was given Logem and my psychiatrist was surprised by the brand change (he had prescribed Lamictal). He expressed no concerns about this though. Today I saw this article in the daily news: https://www.stuff.co.nz/national/health/115711290/taranaki-man-fearful-drug-funding-change-will-bring-back-a-life-of-seizures Basically this epilepsy sufferer has been taking Lamictal, which was previously funded by the govt here, but the change to Logem means that only Logem will be funded and Lamictal will now cost hundreds of dollars for anyone to get. What I don't understand is why is it a problem to change to Logem when both Logem and Lamictal are just different brands of the same drug? The article makes it sound like pharmac are now funding an entirely different drug. Are there differences between different brands of the same medication? I suppose if one brand is cheaper then it must be made up of some different ingredients?