Hi - I've been diagnosed with epilepsy for about 15yrs (am now 43yrs). Until Christmas last yr I was seizure free for 7 yrs. We went on holiday for 2 weeks down to the coast and then returned to altitude in Johannesburg (6 000ft?) and 2 days later I had a seizure - my mediction was increased by 50% and was then found to be in the therapeutic range. Then 2 days ago it happened again after coming back from holiday at the same place. My meditation is Convulex (3x300mg/day) i.e. valproic acid. My pharmacist thinks there may be a link with haemoglobin level changes with altitude and medication effectiveness - any ideas?