I Am On Many Medications Including Januvia, Azathioprine(Imuran), Lialda, Alendronate(Fosamax),

I am on many medications including Januvia, Azathioprine(Imuran), Lialda, Alendronate(Fosamax), Mirtazapine, Flovent, and Ventolin. My liver function tests have come back as slightly elevated. Can any of these medications be the cause? What is interesting is my husbands liver function tests have been very high for the last 3-4 years. Ultrasound tests finds the liver to be OK. Enviromental????