Does " had to seek out alternative options to fill prescription blends" mean...?

Does " had to seek out alternative options to fill prescription blends" mean "had to find other ways to replace the custom herb blends (concoctions)"?

Context:

Changes to Ohio laws in 2012 opened the door for licensed Chinese herbal therapists to legally prescribe custom herb blends and traditional formulas within a clinical practice. The clinical expertise of the herbalist coupled with attentive vigilance from a practicing physician decreases the risk of drug-herb interactions, similar to drug-drug interactions patients experience while taking multiple prescription drugs.
The Chinese Herbal Therapy Clinic offers this new avenue for patients interested in a holistic approach to their care in a safe and effective manner.
“There is a general assumption that ‘natural’ means ‘safe,’” said Jamie Starkey, LAc, lead acupuncturist. “That’s not always the case. As both medical professionals and specialists in Traditional Chinese Medicine, it’s our responsibility to address our patients’ needs, but also prescribe safe, high quality herbs that will be effective and beneficial to their health.”
Prior to state law changes, patients interested in Chinese herbal therapy had to seek out alternative options to fill prescription blends which made them vulnerable to negative side effects.
Requiring physician referrals for Chinese herbal therapy encourages a collaborative effort between the patient’s doctor and herbalist and increases the likelihood of a positive patient experience while using herbs.

More:
http://my.clevelandclinic.org/media_relations/library/2014/2014-3-5-cleveland-clinic-among-first-in-the-us-to-open-hospital-based-chinese-herbal-therapy-clinic.aspx