Ephedra alkaloid content varied considerably among products. Total alkaloid content ranged from 0.0 to 18.5 mg per dosage unit. Ranges for (-)-ephedrine and (+)-pseu-doephedrine were 1.1-15.3 mg ...

Natural products that have been reported to interact with drugs in humans include coenzyme Q 10, dong quai, ephedra, Ginko biloba, ginseng, glucosamine sulfate, ipriflavone, melatonin, and St.