Combined syringe planner
Plan a multi-compound draw, see the fill level compound by compound, and get told when two things should not share a syringe. 56 injectables, free, no account.
Two separate questions get run together when people combine compounds in one draw, and only one of them is arithmetic. The arithmetic is easy: a dose divided by the vial's concentration is a volume, volumes add, and the total either fits the barrel or does not. The other question is whether the two solutions should be in the same barrel at all — and that one is about chemistry, not capacity.
Worked through: 60 mg of a 200 mg/ml oil is 0.3 ml, 250 mcg of a 2,500 mcg/ml aqueous peptide is 0.1 ml, and 0.4 ml fits a 1 ml syringe comfortably. The planner will still stop you — because one is oil-based and one is water-based, and mixing those two phases in a barrel makes the dose of each unreliable.
The compatibility rules, and why each one exists
Established clinical use These are formulation rules rather than clinical ones — they are about what the solutions do, and they are the same three the app enforces.
Oil and water do not share a syringe
An oil-based injectable and an aqueous one are immiscible. In a barrel they separate, and because they separate you cannot know what proportion of each you are actually delivering — including at the end of the push, where whatever settled last goes in first. The arithmetic says 0.4 ml; the syringe delivers an unknown split of it. The planner blocks this combination rather than warning about it.
Aqueous suspensions draw alone
A suspension is solid particles held in a liquid, not a dissolved solution. Drawn with anything else, the particles distribute unevenly and can also be filtered unevenly by the needle. There is no reliable way to co-draw a suspension, so it is a block too.
You will not be able to trigger that one here, and it is worth saying so rather than leaving you to wonder. The rule is real and the planner enforces it, but every suspension in the app's reference belongs to a class this site does not publish pages for, so the list above contains none. The rule is documented because you may meet a suspension outside this list; it is not demonstrable on this page.
Fragile proteins are not blended
Some peptides — growth hormone and IGF-1 among them — are large, structurally delicate proteins that lose activity when they are agitated, exposed to a different pH, or left in contact with another solvent. Mixing them into a shared draw risks degrading them into something inert. The planner flags these rather than blocking them, because the risk is loss of potency rather than an unmeasurable dose.
What the planner knows about
- Injectables listed
- 56 — 3 oil-based, 53 aqueous, 0 suspensions
- Syringe sizes
- 0.3 ml insulin (30u) · 0.5 ml insulin (50u) · 1 ml insulin (100u) · 3 ml (drawn in ml)
- What it computes
- Volume per compound from dose ÷ vial concentration, the total against the barrel, and the fill shown as a stacked diagram coloured per compound.
- What it does not do
- Decide a dose, check a clinical interaction, or vouch for what is in a vial. The combination question about your body rather than your syringe is a different page.
Compatibility in a barrel is not the same as safety in a person. Two compounds that co-draw perfectly well can still be a combination worth thinking twice about, and two that cannot share a syringe may be entirely reasonable injected separately. For the pharmacological question — whether these two should be taken together at all — see can you take these together, and take anything you are unsure about to your prescribing clinician or pharmacist.
Questions people actually ask
Can I mix two water-based peptides in one syringe?
Usually yes as far as the formulation goes, and the planner will let you — CJC-1295 and ipamorelin drawn together is the common example. What it still checks is the total volume against the barrel, and whether either one is a fragile protein. Whether the combination makes sense is a separate question from whether it draws.
Does drawing two compounds together change the dose of either?
Not if both are true solutions and the total fits — you are delivering the same milligrams, in more liquid. That is exactly why the oil-and-water case is a block rather than a warning: there, the delivered amount of each becomes genuinely unknown.
Why does the diagram matter if I have the numbers?
Because a volume in millilitres is abstract and a fill line is not. Seeing that a planned draw reaches the top of a 1 ml barrel tends to prompt the right question — is this one injection or two — before the syringe is in your hand rather than after.
Is this list every injectable?
No. It is every entry in the app's compound reference that has an injectable formulation recorded, minus the ones this site does not publish pages about. A vial in front of you that is not on the list is not thereby unusual; the list is what the app models, not a formulary.
Related: the reconstitution calculator for the concentration each of these draws depends on, and units and millilitres.
In the app the planned draw logs as one injection across every compound in it, with the site rotation and the vial counts kept up to date.
Save this dose to your logThis calculator does the arithmetic you typed and nothing else. It does not know what is actually in your vial, whether the label is accurate, or anything about you. Confirm the vial strength and the diluent volume on your own label before you draw, and take dosing decisions to a qualified provider.