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Classification of lethal injection drug protocols_
| Classification | Characteristics | Examples |
|---|---|---|
| Barbiturate combination | Sodium thiopental or pentobarbital in combination with a paralytic and a heart-stopper | Sodium thiopental, pancuronium bromide, and potassium chloride (traditional three-drug protocol) |
| Barbiturate overdose | Sodium thiopental or pentobarbital on their own | Sodium thiopental alone |
| Sedative combination | Midazolam, etomidate, or diazepam in combination with other drugs | Midazolam and hydromorphone |
Drug protocols used between 2010 and 2013_
| One-drug | Three-drug | |
|---|---|---|
| Sodium thiopental | Ohio, Washington | Texas, Louisiana, Oklahoma, Florida, Mississippi, Virginia, Alabama, Georgia, Arizona |
| Pentobarbital | Ohio, Arizona, Idaho, Texas, South Dakota, Georgia, Missouri | Oklahoma, Texas, South Carolina, Mississippi, Alabama, Arizona, Georgia, Delaware, Virginia, Florida, Idaho |