I have a rash that is spreading from my back to other areas! The doctor gave me an antibiotic doxycycline mono, substitute for monodox! It has some side effects that scare me because I already have some of these symptoms without taking the medication! I take several other medications as well! They are :. Synthroid, HYZAAR(losartin), carvedilol, plavix, asprin, Ms contain (15 mg 2x/day), MIROLAX (2x/ day), (as needed: hydroclorochiacide, morphine sulfate(1/4 tablet as needed) about every 8 days when the pain gets severe)., Lydocaine to apply for pain, vitamins: C, D3, Calcium Citrate, (potassium & magnesium as needed)! I have a heart condition, am 80 yrs old, have severe arthritis, Is there an antibiotic that would work without all the side effects! I am allergic to yellow dye, cipro, & a few others. What would you recommend?