Are sedatives downers?

Not necessarily. "Downers" is vernacular -- slang -- and as such isn't very specific. I've heard sedatives, hynotics, narcotics and antihitimines all called downers (and pot too, which is...

Something that relaxes you, like a Valium

A sedative is a medication used to put you to sleep for rest.

Yes

(prescription painkillers, sleeping pills, tranquilizers, heroin and opium) are dangerous because too much of any of these drugs may cause a coma or death. Mixing sedatives with each other or with...