Diazepam is sometimes used with other drugs to take care of muscle spasms and stiffness, or seizures.verapamil will enhance the stage or effect of diazepam by influencing hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.The anticonvulsant Houses of diazepam and also other benzodiazepines could be partly or fully due to binding to vo