11.   The banned drug may mask the use of steroids and other performance-enhancing substances.

12.   The IOC decided Tuesday to upgrade diuretics to the same status as a steroid because of its ability to mask the use of the harder drugs.

13.   The list of banned substances includes stimulants, steroids, hormones and diuretics, which are commonly used to mask the use of other banned substances.

14.   The substance, acetazolamide, also can be used to mask the use of performance-enhancers.

15.   Triamterene can be used to mask the use of anabolic steroids.

16.   Triamterene is a banned diuretic which can be used to mask the use of anabolic steroids.

17.   It is a stimulant that can also mask the use of other substances.

18.   Probenecid can relieve fatigue, the eternal problem of Tour riders, and can also mask the use of steroids.

19.   The drug which world breaststroke recordholder Samantha Riley tested positive for could not mask the use of bodybuilding steroids, a drug testing expert said here Thursday.