It's a bad idea to use your interrupt in a macro, save it for when it's needed. As the interrupts no longer do damage yet can still be used at anytime.
A macro i use alot on my war22/pali38/champ0 lvl 45.
cast shield throw cast face slam cast aggressive block cast retaliation
another one i use is
cast power strike cast paladin's reprisal
make sure when you put these in that you type them exactly as they appear or they wont work. i use a mouse taht is programible and this is basicly the page forward and page back on my mouse. so can just spam it when retaliation lights and basicly do alot of damage as a pali tank.