"took 5 mg on a friday, it put me to sleep for 12 hours. took another 5 mg the next day and my chest seized up and my left arm lost sensation. i then started having heart arrhythmia every minute to the point where my entire left side of my chest hurt. i had no energy for the entire weekend. i felt depressed and miserable and in pain. i tried one more time sunday night before bed and it woke me up from a dead sleep with chest pain and arrhythmia.  i still have chest pain and arrhythmia and i&#039;ve been off of it for 1 week. my energy levels are still low and i get out of breath easily. i have never had any problems cardio wise in the past."