Is an Adaptogen. It is commonly used for its ability to prevent anxiety. It also is helpful in relieving insomnia. It's name means "Smell of Horse" due to its smell and the traditional belief that ingesting the this herb will give you the strength and virility of a horse.
Depressants are drugs which reduce arousal and stimulation in the user, characterised by a depressing of mental and physical functions.Read more on TripSit Wiki...
Common drugs are those which are well known and widely used among the drug community. This doesn't necessarily mean they are safe, but it usually comes with a longer relative history of use in humans with which to establish a safety profile.
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No interaction information for Ashwagandha