"when i first started this on 10mg, i had bad sides. insomnia, crawling skin, heart palpitations and shallow breathing. i think a lot of it was in my head and from reading too much about side effects. my doctor wanted me to go back on celexa but i had already been on lexapro 3.5 weeks so i asked my doc if i could stick with it. he bumped my dose up to 15mg and its now been 2 weeks on 15 mg and it has helped alot with my anxiety and panic attacks. i can now actually function at work. give it a chance. i&#039;m no doctor but for me it took over 4 weeks. it worked! hang in there."