However, depending on the context, you could use:
* Course: This emphasizes a structured series of treatments, like "a course of antibiotics."
* Regimen: This implies a carefully planned set of treatments, like "a treatment regimen for cancer."
* Therapy: This is a more general term, often used for medical or psychological treatment.
* Program: This can be used for a comprehensive set of treatments and services.
You could also use more descriptive phrases, like:
* A range of treatments
* A series of therapies
* A variety of medical interventions
Ultimately, the best collective noun to use will depend on the specific context of your writing.