"i have reviewed hydroxyzine before, but i am revising it. i suffer from anxiety, panic attacks &amp; paranoia. when i first started taking hydroxyzine it helped me. the only side effects i had were drowsiness &amp; dry mouth. all of a sudden i developed a tolerance to it. the doctor kept raising my dosage until he had me on 100 mg, which is the highest dosage you can take. it still didn&#039;t help me, so i stopped taking it."