The fact is: there must not be such thing as "hypotension protocol". At all. Whatsoever. Under no circumstances.
"Hypotension" is too relative thing and it has too many possible causes to be managed under premise "one size fits most". My own normal working BP is 90/50, maybe less, with HR usually low 100th. I lost count of how many times I had to literally run AMA for my life because someone with accidental RN or MD after last name decided that these numbers alone justify every test, task and thing known to humankind to be done because "they satisfy criteria". I am also sick and tired of treating patients with known systolic CHF, ESRD, on 5+ hypotensives, etc. after they were given a liter or two bolus for "dehydration" and then tankload of Lasix for "elevated BNP".
Levophed is not "better" and not "worse" than dopamine, or vasopressine, or dobutamine, or any other pressor. They all work differently and therefore each of them has separate indications, contraindications, precautions and side effects. Study your pharm, pathophysiology and, first and foremost, know and access your patient. Then you will know what is the best choice in every clinical situation. Treat patient, not numbers, charts or monitor screen. Become a clinical expert and advocate for your patients if you see someone holding onto numbers for dear life instead of treating them. And, above it all, be a CLINICIAN, not a "task-oriented" protocol follower.
Sorry for not giving you what you want to hear. But it is for every single one of us, every single mouth, set of eyes and pair of hands to prevent substitution of various protocols for critical thinking. I am not against all protocol and guideline but hanging Levophed or dopamine on everybody whose BP is 90/50 or below doesn't matter why and what is just as "intelligent" and safe as bloodletting everyone first thing, like it was done 500 years ago.