200 mg/mL to 100 mg/mL

[raichu]

so I recently got a refill on my testosterone and while I've been taking the 200 mg/mL strength injection until now, my endocrinologist for some reason ordered me the 100 mg/mL. she didn't realize this at all and just told me to take the same dose until I pointed out that the new vial is a weaker strength. I think she just ordered the wrong one on accident? anyways, since the 100 mg/mL solution is presumably half the strength as the 200 mg/mL, do I now double the amount of solution I inject??

my endocrinologist told me to just double it

[jasoncowl17]

Okay first off mg's and ml's are different. So if you measuring milligrams and millilitres as the same you dosing is way off. If the type of testosterone is different than your okay.  Delatestryl is two times more potent than depot testosterone. If your in doubt just get your ends to order you a whole new bike of testosterone


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[raichu]

I'm not measuring them as the same, and they're both depo testosterone, I'm saying my old vial has a solution of 200 mg of testosterone per each mL of solution and the new one has 100 mg of t per each mL. here's a picture since you seem to be confused:

[Sophia Sage]

Yes, if you were taking 1cc before, you'd need 2cc to get the same dose (which also means you'll finish the vial in half the time).  "Dose" refers to the number of mg you pull into the syringe, not the number of millilitres. 

[JoanneB]

You are correct. The dilution, or proof, is 1/2 of what you were using so you need to inject 2x of what you were doing in order to get the same number of milli-grams of T into you. It takes twice the liquid volume to do that because it is more watered down, so to speak.

[Magnus]

I go through this every damn time I go in for a new script. Always wrong, despite my giving them the damn National Drug Code (specifically so that errors like these don't happen; but these people still manage to get it wrong anyway). If it's not the concentration (100mg instead of 200mg), then it's 1mL vials instead of the 10mL vial (I can't get my full dose out of 1mL vials - they also cost a LOT more). Once they even put down Enanthate ($158) instead of Cypionate ($104); I don't even know if I have allergies to Enanthate! Now it's BS FDA controlled crap they're pulling with me... don't want you to have "more than a three month supply", damn the consequences (translation: we don't care if it's far more costly, and that your dose amount can't be derived from 1mL vials; HA-HA!). Absolutely ridiculous. Exactly why government has no business being involved in healthcare. And funny that NOW it's suddenly a concern, more than four years in.

Anyway... yes, you would have to double your dose volume to still get your full dose amount out of the 100mg concentration. HOWEVER, you will finish your vial in half the time you normally do (of the 200mg concentration vial). That could be a real problem if your doc decides to be a jerk and not give you a refill to carry you over to your next, typical, script issuance. In that scenario, it would actually be best to keep your normal volume but at half the dose concentration... some T is better than none, and, because it's really not good to start, stop, start, etc. T during the first five years or so. Puberty doesn't happen like that naturally... there could be physiological consequences (e.g. larynx development).

So, IN EXAMPLE, if you're at 1mL @ 200mg per 1mL then for 100mg @ 1mL you'd have to draw up 2mL to equate the dosage concentration of 1mL @ 200mg. AND NO, THIS IS NOT A DOSAGE, THIS IS A, AND RELEVANT, EXAMPLE OF CONCENTRATION/POTENCY X VOLUME (no other way to clearly explain it).

P.S. When, rather than if, this happens again you need to NOT pay for it. Get the pharmacy to call your doctor and request a correction - tell the pharmacist EXACTLY what it should be too, so they can tell the doc. If you pay for the incorrect med, you're stuck with it. And you don't need to be - and I'll clarify that further, IF this was a genuine error (not FDA BS being needlessly pulled over on you).