. This primes the bottle for when you withdraw the insulin later. Pull back the plunger of the syringe to the dose of the shorter acting clear insulin in this example 10 units. You now have 10 units of air in the syringe. Check the insulin bottle to ensure you have the correct clear type of insulin. With the insulin bottle held firmly on a counter or tabletop, insert the needle through the rubber cap into the bottle. Push the plunger down so that the air goes from the syringe into the ...