The purpose of this study is to improve tolerance of treatment of pulmonary Mycobacterium avium Complex disease via the use of therapeutic drug monitoring and the addition of anti-nausea medication or dietary supplements to the patients' daily drug regimen. The aims of this study are to use (1) Zofran® (Ondansetron 8mg), an anti-nausea medication or (2) a dietary supplement to decrease medication related gastrointestinal side effects of medications used to treat Mycobacterium avium Complex.