Editing (section) Cartridge 0 You are not logged in. The rich text editor does not work with JavaScript switched off. Please either enable it in your browser options, or visit your preferences to switch to the old MediaWiki editor <h2>Disposable pen with a syringe</h2> <ul data-rte-empty-lines-before="1"><li data-rte-spaces-before="1">If you are stuck with a disposable pen (e.g. <a data-rte-meta="%7B%22type%22%3A%22internal%22%2C%22text%22%3A%22Novo%20Nordisk%22%2C%22link%22%3A%22Novo%20Nordisk%22%2C%22wasblank%22%3Atrue%2C%22noforce%22%3Atrue%2C%22wikitext%22%3A%22%5B%5BNovo%20Nordisk%5D%5D%22%7D" data-rte-instance="50134-12679747295df0e2d652f8e" href="/wiki/Novo_Nordisk" title="Novo Nordisk" class="mw-redirect">Novo Nordisk</a>'s <b>Flexpen</b>), and need the extra precision of a syringe, things get a little tricker. You must inject extra air BEFORE you draw out the insulin. </li></ul> <ul data-rte-empty-lines-before="1"><li data-rte-spaces-before="1">Fill the syringe with air, empty it into the pen, then (with pen above syringe), suck the same amount of insulin back out. Do it this way whether you're transferring to a vial, extracting 1ml at a time, or just using the pen every day as a vial. </li></ul> <ul data-rte-empty-lines-before="1"><li data-rte-spaces-before="1">Here's why -- as you remove the insulin from the Flexpen, the pressure inside the cartridge will drop, which will pull on the pen's screw-and-plunger mechanism, which doesn't expect to be pulled. (Just pushed). </li></ul> <ul data-rte-empty-lines-before="1"><li data-rte-spaces-before="1">Eventually, the screw-and-plunger will break, possibly contaminating the insulin. So you must try to keep the pressure inside the pen about neutral or a bit positive (pushing back on the screw). </li></ul> <ul data-rte-empty-lines-before="1"><li data-rte-spaces-before="1">Finally, don't ever try actually using the Flexpen again as a pen once you've begun this process! It is practically guaranteed to break eventually. Possibly spectacularly. </li></ul> <ul data-rte-empty-lines-before="1"><li data-rte-spaces-before="1">Using a pen some days, and a syringe other days, has caused problems for some users. The dosages on the pen are not exactly the same as those shown on the syringe. If you must do it, keep one pen for syringe use, and another for pen use, and mark them clearly. </li></ul> <p data-rte-fromparser="true" data-rte-empty-lines-before="1">Until the advent of the <a data-rte-meta="%7B%22type%22%3A%22internal%22%2C%22text%22%3A%22Caninsulin%20VetPen%22%2C%22link%22%3A%22Insulin_pen%23VetPen%22%2C%22wasblank%22%3Afalse%2C%22noforce%22%3Atrue%2C%22wikitext%22%3A%22%5B%5BInsulin_pen%23VetPen%7CCaninsulin%20VetPen%5D%5D%22%7D" data-rte-instance="50134-12679747295df0e2d652f8e" href="/wiki/Insulin_pen#VetPen" title="Insulin pen">Caninsulin VetPen</a>, Lente-type insulins (<a data-rte-meta="%7B%22type%22%3A%22internal%22%2C%22text%22%3A%22Semilente%22%2C%22link%22%3A%22Semilente%22%2C%22wasblank%22%3Atrue%2C%22noforce%22%3Atrue%2C%22wikitext%22%3A%22%5B%5BSemilente%5D%5D%22%7D" data-rte-instance="50134-12679747295df0e2d652f8e" href="/wiki/Semilente" title="Semilente">Semilente</a>, <a data-rte-meta="%7B%22type%22%3A%22internal%22%2C%22text%22%3A%22Ultralente%22%2C%22link%22%3A%22Ultralente%22%2C%22wasblank%22%3Atrue%2C%22noforce%22%3Atrue%2C%22wikitext%22%3A%22%5B%5BUltralente%5D%5D%22%7D" data-rte-instance="50134-12679747295df0e2d652f8e" href="/wiki/Ultralente" title="Ultralente">Ultralente</a>, <a data-rte-meta="%7B%22type%22%3A%22internal%22%2C%22text%22%3A%22Lente%22%2C%22link%22%3A%22Lente%22%2C%22wasblank%22%3Atrue%2C%22noforce%22%3Atrue%2C%22wikitext%22%3A%22%5B%5BLente%5D%5D%22%7D" data-rte-instance="50134-12679747295df0e2d652f8e" href="/wiki/Lente" title="Lente" class="mw-redirect">Lente</a>) were not able to be dispensed in pen or cartridge form because the glass ball used to mix the insulin in these devices shattered the Lente crystals. <span data-rte-instance="50134-12679747295df0e2d652f8e" data-rte-meta="%7B%22type%22%3A%22ext%22%2C%22wikitext%22%3A%22%3Cref%3E%7B%7Bcite%20web%7Curl%3Dhttp%3A%5C%2F%5C%2Fwww.childrenwithdiabetes.com%5C%2Fdownload%5C%2Fhanas_insulin.pdf%20%7Ctitle%3DInsulin-Dependent%20Diabetes-Page%2010%7Cauthor%3DHanas%2C%20Ragnar%7Cyear%3D1999%7Cpublisher%3DChildrenWithDiabetes%7D%7D%3C%5C%2Fref%3E%22%2C%22lineStart%22%3A%22%22%2C%22placeholder%22%3A1%2C%22extName%22%3A%22ref%22%7D" class="placeholder placeholder-ext" contenteditable="false"><sup data-rte-washtml="1" id="cite_ref-0" class="reference" data-rte-attribs=" id=cite_ref-0 class=reference"><a 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