I'm interested in Ultherapy for my turkey neck. I am on an immunosuppressant. Will Ultherapy work for me?

ultherapy works in all people regardless of immunosuppression but it will NOT reverse a sagging neck if anything it only will slow the process of sagging down.
post photos to get a comprehensive evaluation, morpheus likely will be better for you but sounds like you may need surgery.

at home peels like cosmelan, enlighten and aerify along with dermarolling (EmerageSkin roller with anteage AERIFY MD ampules weekly, see link) should be started now to prevent further aging.

For facial rejuvenation, I would suggest a combination approach of
1) skin care with products and PRP/microneedling
2) PDT light therapy few times a month with growth factors
3) laser treatments like clear and brilliant regularly and a few times a year Fraxel/halo Viva, Co2/Erbium
4) Sculptra injections a few times a year for collagen production with fillers like juvederm/restylane/belotero/radiesse/bellafill
5) thermage/ultherapy for yearly skin tightening with or without PDO or cone based instalift threads for lifting
6) botox every 2-3 months to stop movement lines and prevent lines at rest
7) deep microneedling RF like Fractora/morpheus8 for tightening of the skin
8) Vascular laser like vbeam/excel V or BBL forever young treatment every quarter (3-4 months)

Best, Dr. Emer.

Preventing facial flaccidityIt's an innovative concept that combines different technologies, preventing facial and body fluids. This treatment innovator logs on to the deepest capabilities of the microcontrolled ultrasound skin, even though our patients are completely natural rejuvenating, producing a skin retraction to maintain the firmness and optimize production ; additional this treatment produces a major hydration increasing the quality and tonality of the skin How long can it last the effect?The duration of the result depends on the age, quality and type of skin, life style and metabolism of each patient, without embarrassment the results can last 12 months or more.
How long does it take to complete this procedure?The duration is about one hour or more depending on the characteristics of each patient and the zones to be treated.
Do you need anesthesia?Depending on the umbrella of pain in each patient, without embarrassment it is recommended to perform local anesthesia for greater comfort and convenience of our patients.
What sessions are required?The results of this procedure are reflected in one session. additional treatments.
Is Incapacity Required?Once the procedure has been completed, the patient can reintegrate into his or her day-to-day activities without any kind of incapacity, without embarrassment following some basic and uncompromising recommendationsbrindadas by the specialist.
How long will it take to see the results?Ultherapy has results that can be seen in short, median and wide space, so its results are progressive, without embarrassment the final effect will be between the quarter or the sixth month.