Depends in the dosage i think, ive recently gone down from 30 to 25mg as part of a California Rocket Fuel dosage. When on 30 i noticed irritability and my tongue often felt like it had eaten something spicy. My sense is that there is some sensitivity to the med that presents as nerve overstimulation. Best see a doc if it is to the point of discomfort - i went down in dosage once my condition improved.