| Title, Format | Label | Cat# | Country | Year | |
|---|---|---|---|---|---|
| Tranquilizer EP (12", EP) | Axis | AX-001 | US | 1991 | |
| Tranquilizer EP (12", EP) | Axis | AX-001 | US | 1991 | |
| Tranquilizer EP (12", EP) | Axis | AX-001 | US | 1991 | |
| Tranquilizer EP (12", Promo, EP) | Axis | AX-001 | US | 1991 | |
| Tranquilizer EP (12", EP) | Network Records, Axis | NWKT 62, AX-001 | UK | 1992 | |
| Tranquilizer EP (12", EP, RP) | Axis | AX-001 | US |