(in a child taking escitalopram) slow growth or weight gain; low levels of sodium in the body--headache, confusion, slurred speech, severe weakness, vomiting, loss of coordination, feeling unsteady; or. ... Adults. Adverse ReactionsLexaproPlacebo Headache24%17% Paresthesia2%1% Gastrointestinal Disorders Nausea18%8% 31 more rows