Individuals with heart irregularities such as atrial fibrillation or flutter or intense clusters of premature ventricular contractions (PVC's), or children who are unable to sit still, may be unable to use the emWave system successfully.
Beta/calcium channel blockers will not interfere with emWave per se; in fact, since one of the effects of either of those medications is to widen the blood vessels, i.e. relaxing the muscle wall, etc., that will help the system read you, ultimately. Vasoconstrictors are another story; those will interfere with the reading of the emWave.
Use emWave and the exercises contained in the software as tools for individual balance, optimal performance and growth. Although this instrument and exercises are believed to be very safe and have potentially great benefit, no medical benefits or cures are expressed or implied. These programs and exercises are not to be used as, or used in lieu of, any course of medical or psychological treatment.