Phentermine - no go for GA?

Just wanted peoples' opinions on this. I recently cancelled a case for an MRI in a claustrophobic patient with Stage 4 ESLD and CHF who was taking Phentermine as a diet drug. I've heard stories that it can lead to dysautonomia/intractable hypotension and I didn't want to risk it in an elective case in a sick patient. Anyone have experience dealing with this? I told the patient to stop taking it for a week and come back for the MRI. What are your thoughts on what to do with a patient... Phentermine - no go for GA?
Source: Student Doctor Network - Category: Universities & Medical Training Authors: Source Type: forums