Huh? You want to use 40iu's.. Geezus... You'd be dead. With Humulin-r i'd start off with 6iu's but make sure you have eaten fast acting carbs before hand and sip on some grape juice after your injection and make sure to have a carb drink or Glucose tabs on hand just in case. since Humulin - r stays in your stystem for 6 hours.
sebastion