Which tetracycline can be used in the treatment of SIADH (syndrome of inappropriate antidiuretic hormone)? Why? Why should tetracyclines be taken on an empty stomach? Do tetracyclines work...

Which tetracycline can be used in the treatment of SIADH (syndrome of inappropriate antidiuretic hormone)? Why? Why should tetracyclines be taken on an empty stomach? Do tetracyclines work synergistically with penicillins? What is the risk from taking expired

tetracyclines? How do bacteria usually become resistant to tetracyclines?