What other drugs will affect Singulair (Montelukast)?
Before using montelukast, tell your doctor if you are using any of the following drugs: • phenobarbital (Luminal, Solfoton); or • rifampin (Rifadin, Rifater, Rifamate, Rimactane). This list is not complete and there may be other drugs that can interact with montelukast. Tell your doctor about all the prescription and over-the-counter medications you use. This includes vitamins, minerals, herbal products, and drugs prescribed by other doctors. Do not start using a new medication without telling your doctor.