Combination with other drugs?

I haven't taken these medicines myself so I don't really know.

The known side effects of Letairis is:

Check with your doctor if any of these most COMMON side effects persist or become bothersome when using Letairis:

Constipation; flushing; nose or throat irritation; stomach pain or upset; stuffy nose.

Seek medical attention right away if any of these SEVERE side effects occur when using Letairis:

Severe allergic reactions (rash; hives; itching; difficulty breathing; tightness in the chest; swelling of the mouth, face, lips, or tongue; unusual hoarseness); dark urine; fever; fluid retention; irregular heartbeat; loss of appetite; nausea; pale stools; severe or persistent stomach pain; shortness of breath; sudden weight gain; swelling (eg, of the arms, legs, hands, feet); unusual bruising or bleeding; unusual tiredness or weakness; vomiting; yellowing of the skin or eyes.

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http://www.drugs.com/sfx/letairis-side-effects.html

As for taking these 3 medicines together - there are no known interactions between them.

http://www.drugs.com/drug_interactions.php