Electrocardiographic and blood pressure effects of the ephedra-containing TrimSpa thermogenic herbal compound in healthy volunteers.

Study Objective: To determine the effect of an ephedra-containing thermogenic herbal compound (TrimSpa) on rate-corrected QT (QTc) interval duration and systolic blood pressure.

Design: Randomized, double-blind, placebo-controlled, crossover, intent-to-treat study.

Setting: Student laboratory at a college of pharmacy.