Syringes are labeled based on how much liquid they can hold. Some syringes measure medication in milliliters (ml), others use cubic centimeters (cc). The good news is, 1 cc is equal to 1 ml, so you don't have to worry about confusing conversions when matching a syringe to your dosage. You just need to make sure you select a syringe that will hold the amount of medication you've been prescribed. It sounds intuitive, but if you aren't used to drawing up injectable medications it's worth pointing out. For example, if you're supposed to give yourself 3 cc of a drug, don't use a syringe that holds only 2 cc.