A meq is a milliequivalent which is an expression of concentration of substance per liter of solution, calculated by dividing the concentration in milligrams per 100 milliliters by the molecular weight.    From Wordnik.com.  [Articles of Health] Reference

IU = international unit mEq = milliequivalent mmol = millimol ml = millilitre (1 cc = 1ml) tsp = teaspoon (= 5ml).    From Wordnik.com.  [Chapter 3] Reference