Hi Doc, I have been prescribed Valaciclovir RBX (4 tablets a day) for shingle and I had a bone marrow transplant 5 years ago due to Leukemia. I currently take aspirin (astrix), ramipril, vitamin D, and pravachol daily. I,m concërned that this could cause my kidneys some harm. Do you think I should drop the dose to 3 tablets daily?? Or not take this medicine