Anyone using the Follistim Pen should look closely at the needle after applying it to the pen and after removing it from your skin following your injection. I found that after a few injections the spring on mine was not working properly and I was losing medication. As soon as I applied the needle (before dialing the dose) I noticed medicine coming out into the cap of the needle. If you notice a bead of medication on the tip of the needle before you have done anything there is a chance the spring is bad and you may need to ask the pharmacist for a new one. I haven't counted how many units I have lost. I am sure I haven't lost more than 15 units of medication but when the units are as expensive as Follistim you want to keep as much of it as possible from becoming waste.
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