The Food and Drug Administration (FDA) issued a new warning this week about mixing medication to treat opioid addiction with anti-anxiety drugs. Both types of drugs slow breathing and brain activity.

Combining opioid addiction medications with anti-anxiety drugs can lead to difficulty breathing, coma or death, the agency said. In addition to anti-anxiety drugs such as Valium and Xanax, other drugs that should not be combined with opioid addiction medication include Ambien and Lunesta for insomnia, muscle relaxers Soma and Zanaflex, and antipsychotic drugs Abilify, Invega, and Saphris, the Associated Press reports.

Buprenorphine and methadone, also known as medication-assisted treatment, reduce opioid cravings and withdrawal without producing a high. The FDA is requiring changes to medication-assisted treatment drug labels. The new labels recommend that health care providers develop a treatment plan that closely monitors any simultaneous use of these drugs.