They're just different from person to person. Did they start you with a low dose of Lexapro and
work up, or just start you out on a high dose? And are you seeing psychiatrist or just a doctor -- psychiatrists are pretty clueless about these meds, but primary doctors are completely clueless. Whatever, if the symptoms persist, then this may not be the med for you. Only time will tell. Meanwhile, therapy is essential for any cure, though no guarantee. Meds just treat the symptoms.