Made for heavy snorers, Theravent MAX offers double the EPAP resistance of Theravent REGULAR while remaining comfortable and effective. Theravent Advanced Nightly Snore Therapy is a new, clinically proven therapy that significantly reduces snoring. Theravent features a patented MicroValve Technology which uses the power of your own exhalation to open the airway and treat snoring. Theravent is available without a prescription.