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lexapro or escitalopram is a drug in SSRI group and it is one of most commonly used medicine for depression
disorders in present times.
It is one of safest antidepressant drugs with only negligible side effects.
In some people during initiation of therapy with escitalopram rebound increase in anxiety may occur, which may manifest as Increased heart rate
, palpitations, nausea, restlessness
, some times dizziness
But fortunately the side effects subside after time and you need not to discontinue drug.
Yeah if its very intolerable then you can start with low dose and gradually escalate the dose.
Thanks hope I cleared your doubt.