Some will say it's just a way to get another drug on patent, but since people do have very different reactions to Celexa vs
. Lexapro, there probably are differences here, too. Second, Cymbalta isn't an ssri, it's an snri like Pristiq. Third, snris can be very stimulating because they target norepinephrine. Fourth, you haven't been on the med long enough to get used to it; some are very hard in the beginning. Fifth, you didn't say why you're on these meds.