Taking Valium with other drugs that make you sleepy or slow your breathing can cause dangerous side effects or death. Ask your doctor before using opioid medication, a sleeping pill, a muscle relaxer, prescription cough medicine, or medicine for depression or seizures.
Other drugs may interact with diazepam, including prescription and over-the-counter medicines, vitamins, and herbal products. Tell your doctor about all your current medicines and any medicine you start or stop using.
 Valium drug interactions (more detail)
