The diuretic effects of horsetail may enhance the toxic effects of certain medications, such as digoxin (used to treat congestive heart failure), phenytoin (for seizures), anticoagulants, and others. For this reason, people taking prescription medications should not take horsetail without first consulting a health care provider.
Alternative Names: Equisetum arvense; Horsetail; Scouring Rush; Shave Grass
Review Date: 1/17/2007 Reviewed By: Ernest B. Hawkins, MS, BSPharm, RPh, Health Education Resources; and Steven D. Ehrlich, NMD, private practice specializing in complementary and alternative medicine, Phoenix, AZ. Review provided by VeriMed Healthcare Network.