What are the street names for it?

Valium( candy, downers, sleeping pills, and tranks) , Diazepam, Lexotan, Veronal, Glutetimid, Parkizan, Temazepam ( Wobbly eggs), Temazepam ( temazzies ) , Nitrazepam, etc.

What type of drug is it?

As the name implies, depressants interact to depress the activities of the central nervous system.  There are three categories of depressants:  hypnotics - which induce sleep;  sedatives - which do not induce sleep but produce a relaxing effect;  and tranquilizers, such as Valium and Xanax.  Depressants can be synthetic (barbiturates) or occur naturally in plants.

What does it look like?

Tranquilizers come in tablet, capsule and injectable liquid forms.

How is it used?

Tranquilizers are prescribed by the GPs as short-term treatment for anxiety, depression, and sleep problems. They are misused by some people to counter the effects of stimulant drugs, or taken in combination with alcohol or heroin. Tranquilizers can be supplied lawfully only by a pharmacist to someone with a doctor's prescription.

What are the effects?

Tranquilizers calm users and slow them down mentally. They relieve tension and anxiety. Higher doses can make users drowsy and forgetful. Tranquilizers slow down reactions, making accidents more likely. They are extremely dangerous if mixed with alcohol. Tolerance can develop. Users can become dependant, especially if they rely on the drug to calm them or help them to sleep. Users trying to quit may suffer panic attacks.
Injecting crushed tablets or the contents of capsules is very dangerous and can be lethal.

Physical Dependence:

strong

Psychical Dependence:

strong

Tolerance:

moderate