"it sometimes works when i take 50mg and sometimes i have to take 100mg. i am allergic to tylenol and there are not many options. this medication makes me feel like i have a buzz and i can&#039;t drive when i take it. if i do drive i feel hot, heart starts racing and i almost black out. so i take it in the evening when i am home. i also itch all over. no rash or hives just itching. sometimes it makes me sleepy and other times i can not sleep. to me as long as it helps i can deal with the itching and buzz feeling. "