curiousone

Fiber, fiber and yes more fiber. Oh, and my morning coffee! If I need more, Fibercon.

I'm answering your question as a nurse who works with both bariatric patients and diabetic patients.
First, these are two completely different meds, two different classes, two different ways of affecting the body.
Phentermine is an anoerectic medication and is an amphetamine that decreases the appetite.
Tirzepatide (generaic name for zepbound) is GLP-1 agonist and GIP agonist (it's a dual agonist vs typical single GLP-1 agonist like Ozempic) which stimulates insulin production with the purpose of lower blood sugar levels and helps someone feel full longer.
Second, there is a nationwide shortage of Zepbound since early April because of it's popularity. Patients have started choosing compound pharmacies to create this formula for them instead of discontinuing or changing to different medication. With that being said, the FDA doe NOT regulate compound pharmacies. Historically, compound pharmacy are popular with patients needing hormone replacement therapy and these pharmacies abilities to customize said medications.
Third, medically speaking, the only medication interaction of concern between the two would be once a patient lost considerable weight, that hypoglycemia would be an issue.
In my own experience, yes medical providers will write scripts for dual medications like this for various reasons, circumstances and medical conditions.

I loved it. I was able to drop between 60 and 80 pounds (minimum) every time I used it.
The problem was, I would regain between 75 and 90. It worked wonderfully for me in the short term - and honestly, I don't know what long term damages I may have done to my body.

I had my sleeve done nine months ago, aged 62. I walked with a stick, had severe shortage of breath, high blood pressure and was told 11 months before surgery that I was diabetic. I am a carer for my husband and there were times when he was having to care for me. Things had to change.
I never realised that loosing weight would have made such a huge difference. I gallop through chores, walk miles and have endless energy. The diabetes and blood pressure went within a few months. The only pills I take now are for Fibromyalgia.
The only downside to being overweight and being my age is the loose skin. I will need more surgery .