OK.
We are thinking to use the pen needles instead of drawing the dose out into a syringe — sorry, should have specify. Does it make any difference then?
If I might jump in here with my personal experiences with the Solostar pen injection system? (It's only my personal experience and research so, please take other's into consideration as well and make the determination on which method YOU feel best with).
At this moment in time, I am using whole units. Morrigan is on a full unit so, I decided to use the pen injector system this time. I had a previous diabetic cat over a decade ago and only used syringes as there wasn't an option. In short, I have used both.
Of course, the pen injector only works if your cat is on a whole unit (it does not do increments, half or quarter unit doses). *IF* you are planning on using the Tight Reign Protocol, there will be times when you're going to have to adjust up or down by .25U so, getting used to using a syringe is likely your best bet.).
Having said that, there ARE advantages to using the pen (which was difficult for me to get used to at first, having used a syringe with my previous diabetic cat) but, I did get used to it and frankly, I like it. It's easy to dial up the number and not make big mistakes with it. (Of course, any method *can* produce a mistake but, if you're double checking...either one will be fine).
1) I find that syringes take practice in drawing up the dose and some in here use "callipers" which I just found out about the other day but, don't worry about that right now.
2) I found syringes frustrating in getting out bubbles, getting accurate lines to see and the stopper to the line as well as each brand, measures somewhat differently (which is pretty much only an issue when you're dosing at .25U or less). In my experience, unless using callipers, NO dosing method is 100% accurate and every method has inaccuracies so, unless you're going to go this tiny increment doses...it's not really all that worrisome.
3) when you're frustrated, rushed for time...the pen injector allows you to dial up, shoot and not fiddle with the above.
*IF* you are planning on trying the Tight Reign Protocol where you might get into tiny doses, go with the syringes so that you can get used to using it.
You will likely hear about the pen injector system not being accurate being cold from the fridge etc.. That is not true. I called the manufacturer on several occasions to find that there is NO "harm to the dosing mechanism by keeping it in the fridge. It is a comfort thing only as cold insulin in *larger doses* can sting." Keep in mind...the manufacturer does NOT acknowledge pet usage even though they know that it is being used on pets. Their clinical trials have been on humans only who used a higher dose than our cats would. If you are only using 1 to 2 units, the "sting factor" (unless you have an unusually sensitive cat) is usually NOT an issue so, no need to keep the pen out of the fridge. Keeping it in the fridge and out of light (meaning cover over the pen as much as possible) means that you can continue using the pen until it's pretty much used up or when the pen reaches the expiry date on the box. Generally, you will get a couple of months out of a pen unless your car is a "high dose cat".
You may also hear about the doses "not being accurate" under any circumstances. Well, I have also done experiments where I've drawn up insulin in a syringe and using the pen injector, putting the drops onto a surface side by side and repeating that at least several times. If anything, even being careful to measure the syringe properly (NOT using callipers), the syringe was the least accurate as the human eye, bubbles, steady hand, etc., were in play here. In general though, the amounts were always about the same from the pen injector system.
Now,
the one downside to the pen while using whole units....is that you DO have to hold it in place for a count of 6 to 10 before withdrawing. This wasn't a problem for me as she is usually eating treats while I inject and she could care less what I'm doing back there as long as she's occupied with those treats.

But, as others have mentioned, it can take a bit for the last droplet to get in there unless you do hold it in. The cat really doesn't feel anything much even with the poke, let alone, once it's in. If you don't believe me, take the pen needle (a fresh one with no pen attached) and just poke yourself as a human would do by rolling up the stomach area and poke yourself. Trust me...even knowing I was going to do it...I didn't feel it. I've had far more noticeable mosquito bites than this!

)
So, there you have it from someone else who has used both and is currently using the pen injector system. If I have to go to half units....I will have to go back to using syringes but, for now...I have been enjoying the injector pen and have been liking it (once I got used to using it). Again, it's purely your personal preference.
By the way, I'm editing to add...that I THINK..once you have been using the pen with a syringe instead of the injector tips you screw on, you CANNOT go back to using the injector tips because you will likely be injecting some air which will throw off the dosing mechanism. So, if you've already used the pen with a syringe, don't go backwards and try the injector tips. If you choose to change...wait until you're starting a new pen to use the injector tips.
Hope this helps.
