What other drugs affect Singulair (Montelukast)?
Tell your doctor about all other medicines you use, especially: phenobarbital (Luminal, Solfoton); or rifampin (Rifadin, Rifater, Rifamate, Rimactane) This list is not complete and other drugs may interact with montelukast. Tell your doctor about all medications you use. This includes prescription, over-the-counter, vitamin, and herbal products. Do not start a new medication without telling your doctor.