this is all the info i could get [quote="Drugsdotcom"]What other drugs will affect Singulair? Before using Singulair, tell your doctor if you are using any of the following drugs: phenobarbital (Luminal, Solfoton); or rifampin (Rifadin, Rifater, Rifamate, Rimactane). f you are using any of these drugs, you may not be able to use Singulair, or you may need dosage adjustments or special tests during treatment. There may be other drugs not listed that can affect Singulair. 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.
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