A single vial holding more than one compound, already mixed by whoever produced it, so every dose draws all of them in a fixed ratio. Blends are a supplier product rather than a studied formulation, and the ratio is chosen by the seller. Once reconstituted, a blend is one liquid whose components can no longer be separated.

Why it matters here

Because the ratio is fixed inside the vial, you cannot adjust one component without moving the others, which makes titration and troubleshooting guesswork. If something goes wrong there is no way to identify which compound caused it, and if something goes right there is no way to know which one to keep.

Also called

• blend
• blends
• blended
• pre-mixed vial
• premixed vial
• pre mixed
• premix
• combo vial
• combination vial
• mixed vial
• dual vial
• all-in-one vial
• 2-in-1

Pre-mixed vial and combo vial describe the same product from the buyer's side. Suppliers often name a blend by running the component names together, which makes it look like a single compound to anyone searching.

Compounds carrying this term

None on file yet. This term is in the controlled vocabulary but no compound record currently uses it — which is a statement about our coverage, not about the term.

See also

• Stack — Dosing and scheduling
• Co-administration — Dosing and scheduling
• Dose — Dosing and scheduling
• Subcutaneous — Route of Administration