Do not store unused mixtures of food, formula, or breast milk and the medication. GI Diarrhea, dyspepsia, gastroenteritis, laryngitis, nausea, tooth infection at least dental pain, infectious gastroenteritis pancreatitis, vomiting postmarketing. Tell your doctor if you are pregnant, plan to become pregnant, or are breast-feeding. Tell your doctor immediately if any of these unlikely but serious side effects occur: fever, persistent sore throat earache, flu symptoms. Nursing Mothers Studies in rats have shown that montelukast is excreted in milk. When montelukast is used to treat allergic rhinitis, it may be taken at any time of day. Why is this medication prescribed? Pending revision, jotta montelukast online the material in this section should be considered in light of more recently available information in the MedWatch notification at the beginning of this monograph.