• If you are a diabetic, your blood sugar levels need to be monitored to help prevent fluctuation, according to the American Diabetes Association. Medications that cause blood sugar levels to fluctuate must be approved and monitored by a doctor.

    What is Singulair?

    Singulair, whose active ingredient is montelukast sodium, is a prescription medicine for the treatment of asthma and allergic rhinitis symptoms and the prevention of exercise-induced asthma, according to Singulair's patient information website.

    Side Effects of Singulair

    Singulair's patient information website lists no side effects pertaining to blood sugar levels. However, a website on Singular and Weight Gain contains anecdotal evidence that some patients experienced weight gain with Singulair. Weight gain can be a factor in fluctuating blood sugar levels, according to the American Diabetes Association.

    What is Flomax?

    Flomax, whose key ingredient is tamsulosin hydrochloride, is a medicine prescribed to treat urinary problems caused by an enlarged prostate, or BPH, according to the Flomax patient information website.

    Side Effects of Flomax

    The Flomax patient information website lists no blood sugar level or weight gain side effects. However, November 2008 research issued by the Netherlands Pharmacovigilance Centre reported that three diabetic patients who were taking tamsulosin for an enlarged prostate experienced hyperglycemia and increased blood sugar levels while on the medication.

    Talk With a Doctor

    While research is still insufficient to prove a connection between Singulair or Flomax and fluctuation in blood sugar levels, if you are diabetic and need to take either medication, you should discuss the medications, your diabetes and possible changes to your blood sugar levels with your doctor.


    American Diabetes Association website Singulair patient information website FLomax patient information website

    More Information: Singulair and Weight Gain Tamsulosin and Hyperglycemia research

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