Marshmallow root shouldn't interfere with your meds if taken 2 hours apart from meds, but will usually soothe an inflammed or irritated stomach. I used to take Nature's Way brand purchased at a local health food store - 1-2 caps 2-3x/day. This herb creates a coating that is soothing and healing to the gut lining...this is due to the herb's mucilagenous properties. Other herbs that do similar things are Slippery Elm Bark, Licorice Root (be sure to get the DGL form or else it could spike blood pressure), Burdock Root (warning: this herb can act as a laxative), and many others...but of all these herbs, marshmallow root is the most gentle and benign. For more info about Marshmallow root, see http://www.florahealth.com/flora/home/USA/HealthInformation/Encyclopedias/MarshmallowRoot.htm and http://www.umm.edu/altmed/articles/marshmallow-000265.htm (I have no financial connection with these websites/companies - I just found them using Google...).
Chronic Lyme Disease, Chronic Bartonella (clinical dx only), Gluten & Sulfite Sensitivity, Many Food/Inhalant/Medication/Chemical Allergies & Intolerances, Asthma, Gut issues (dysmotility, non-specific inflammation), UCTD ("Secondary Lupus-Like Syndrome"), Osteoporosis, chronic Lymphopenia, etc.; G-Tube; Currently weaning off TPN.
Meds: Pulmicort, IV Doxycycline, Heparin (to flush PICC line), Claritin, Singulair, Domperidone, Colloidal Silver (topically & nasally), probiotics, Liver support herbs, Ailanthus, digestive enzymes, homeopathy.