- Use of amphetamines in the 2 days prior to screening or has a need to use these drugs during the course of the study. All stimulant prescription, and nonprescription products such as catecholamines (norepinephrine or epinephrine), ephedrine, pseudoephedrine and any other amphetamines in the 48 hours prior to screening or has a need to use these drugs during the course of the study. All herbal products except coffee, tea, or herbal tea are also prohibited within 48 hours prior to screening or if the subject has a need to use these drugs during the course of the study. Coffee, Tea, and Herbal Tea are not exclusionary criteria or prohibited medications as they are food products not prescription or nonprescription products.