My dr gave me a prescription for Flexiril. I have lower back pain due to a bulging disk, and also have arthritis in my right hip and knee. I have rheumatoid arthritis also. I am a dialysis patient and also have an enlarged liver, from previous Hep C, but liver is stable now and Hep C is dormant. I have an ICD defibrillator and take Amiodorone, Metoprolol, Diltiazem, and Warafin. I am worried the Flexiril will affect my heartrate and maybe make my bp too low. I haven t filled the prescription yet. What do you think? Is it safe to take a muscle relaxant like this before bed if needed? I do have sleep apnea too but don t use a CPAP.