Newer (and more expensive) doesn’t mean better. Sudafed performs about the same as Singulair:

The research, published in the Archives of Otolaryngology — Head & Neck Surgery, is based on a small sample and focuses exclusively on two specific drugs: a 240-milligram dose of pseudoephedrine hydrochloride (sold over the counter under the brand name Sudafed 24 Hour) and a 10-mg dose of montelukast sodium (prescription brand name Singulair). “When we compared them head-to-head, we found that for treatment of allergic rhinitis, these drugs at these doses were virtually identical,” said Dr. Fuad Baroody, associate professor of surgery at the University of Chicago and the study’s director. “This came as a genuine surprise.”

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