^a Both ampul and vial formulations tested.

^b Mixed in equal quantities. Final concentration is one-half the indicated concentration.

^c Mixed in varying quantities to yield the final concentrations noted.

^d Diluted with sterile water for injection.

^e Mixed in equal quantities for testing.

^f Vial formulation tested.

^g Ampul formulation tested.

^h Both preserved (benzyl alcohol 0.9%; benzalkonium chloride 0.01%) and unpreserved sodium chloride 0.9% were used as a diluent.

ⁱ Test performed using the formulation WITHOUT edetate disodium.

^j Diluted in sodium chloride 0.9%.

^k Hydromorphone HCl powder dissolved in ziconotide acetate injection.

^l Extemporaneously compounded.