My 18 year old daughter has been on this medication over 2 years, at dinner she was eating, took a drink of water, and put her hand over her chest and she just dropped to the table. she aroused with in 10 seconds,. my husband grabbed her arm and i grab bed her face. could this be a side effect. i did check her pulse after about 5 minutes, we were really shaken up and it was about 68, i am a nurse, and did not know if she had an arrythmia d/t medication.