| 21220-119 | Oxygen | Oxygen | Gas | Respiratory (inhalation) | Human Prescription Drug | ACTIVE |
| 21220-120 | Nitrogen | Nitrogen | Gas | Respiratory (inhalation) | Human Prescription Drug | ACTIVE |
| 21220-122 | Nitrous Oxide | Nitrous Oxide | Gas | Respiratory (inhalation) | Human Prescription Drug | ACTIVE |
| 21220-123 | Carbon Dioxide | Carbon Dioxide | Gas | Respiratory (inhalation) | Human Prescription Drug | ACTIVE |
| 21220-130 | Oxygen Nitrogen Mixture | Oxygen Nitrogen Mixture | Gas | Respiratory (inhalation) | Human Prescription Drug | ACTIVE |
| 21220-152 | Air | Air | Gas | Respiratory (inhalation) | Human Prescription Drug | ACTIVE |
| 21220-155 | Helium/oxygen Mixture 80/20 | Helium/oxygen Mixture 80/20 | Gas | Respiratory (inhalation) | Human Prescription Drug | ACTIVE |
| 21220-156 | Carbon Dioxide Oxygen Mixture | Carbon Dioxide Oxygen Mixture | Gas | Respiratory (inhalation) | Human Prescription Drug | ACTIVE |
| 21220-157 | Carbon Dioxide Air Mixture | Carbon Dioxide Air Mixture | Gas | Respiratory (inhalation) | Human Prescription Drug | ACTIVE |
| 21220-158 | Helium/oxygen Mixture 70/30 | Helium/oxygen Mixture 70/30 | Gas | Respiratory (inhalation) | Human Prescription Drug | ACTIVE |
| 21220-200 | Helium | Helium | Gas | Respiratory (inhalation) | Human Prescription Drug | ACTIVE |
| 21220-121 | Helium | | | | | |
| 21220-124 | Air | | | | | INACTIVATED |
| 21220-125 | Carbon Dioxide Air Mixture | | | | | INACTIVATED |
| 21220-127 | Helium/oxygen Mixture 80/20 | | | | | INACTIVATED |
| 21220-128 | Helium/oxygen Mixture 70/30 | | | | | INACTIVATED |
| 21220-129 | Carbon Dioxide Oxygen Mixture | | | | | INACTIVATED |