I am on several medicines and I am curious if Sambucus (Elderberry) can have any adverse reactions to my medicines. Metformin, atorvastatin calcium, Lisinopril, tamsulosin, allopurinol. I ve been told that the elderberry extract in Sannbucus could boost my immune system to keep me from getting the flu, but I don t want any adverse reaction with my other medicine. I recently was diagnosed with diabetes type II and I had multiple heart by pass surgery. The last two are to help alter my urine ph to stop the formation of kidney stones. All are prescribed by my GP doctor, cardiologist, and urologist.