I can't sleep at night because of allergies. I take zyrtec and singulair, (montelukast) together, but still have symptoms, primarily an itchy throat at night.?

Allergy/poor sleep. Do try prilosac for gerd as dr. Bansal suggested. You may also try one of the older antihistamines like Benadryl (diphenhydramine) or chlortrimeton which may help you sleep. You can still take zyrtec in the day time. Singulair can still be taken at night. It has no effect on sleep. If medicines are not helpful, allergy evaluation and immunothrapy may be helpful.
GERD? You may have gastroesophageal reflux disease (gerd) or heartburn. Especially at night, symptoms can get worse because acid will travel up the esophagus in the recumbent position and irritate the throat. If you have asthma, this can aggravate the asthma then. See your doctor about this. A trial of prilosec, for example, may help.

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I'm a type 2 diabetic also im positive on all skin allergy test im on zrytec and singulair (montelukast) I still have itchy entire body usung diabetic lotion why?

Dry Skin. Generalized itching without primary skin rash most commonly caused by dry skin. Most severe during the winter months and in older people, characterized by itching in areas of dry, scaly skin. Lab work can check if there is an underlying cause: CBC/diff, liver/renal function tests, and thyroid workup. Treat with daily moisturzation and better skin hygiene. Non-sedating antihistamines for itch. Read more...