The Synthetic Drug Control Act, H.R. 1254, was introduced by Rep. Charlie Dent (R-Pa.) as a way to control what he and other supporters say is a rise in the misuse of synthetic drugs that can be bought legally. Dent also said these drugs are being sold as "bath salts" or "plant food."
The bill would put 16 "cannabimimetic" and 15 hallucinogenic drugs that can now be bought legally on Schedule I of the Controlled Substances Act, which bans drugs that have a high potential for abuse and have no use in medical treatment.
Some Democrats argued this week that the ban would stifle medical research, but these arguments were not enough to prevent the 290 votes needed for passage.
House passage sends the bill to the Senate. The White House has not issued any statement on whether it supports or opposes the bill.