Table 2.
NAC clinical trials registered at ClinicalTrials.gov [48]. The number of studies is displayed according to the study status, tested medical conditions of currently active studies, tested medical conditions in completed studies, study phase and tested medical conditions of currently active studies, study phase, and tested medical conditions of completed studies.
| Status | Count |
| Completed | 159 |
| Not yet recruiting | 14 |
| Active | 54 |
| Withdrawn/terminated/suspended | 24 |
| Unknown status | 40 |
| Grand Total | 291 |
| Medical Conditions (Active Studies) | Count |
| Addiction | 12 |
| Cancer/chemotherapy side effects | 5 |
| Cardiovascular diseases | 5 |
| Gastrointestinal diseases | 4 |
| Genetic disorders | 1 |
| Graft/stem cell complications/trauma | 4 |
| Infectious diseases | 1 |
| Metabolic diseases | 1 |
| Neuro/psychiatric disorders | 12 |
| Obstetrics | 2 |
| Poisoning antidote | 1 |
| Pulmonary diseases | 1 |
| Surgery complications/trauma | 5 |
| Grand Total | 54 |
| Medical Conditions (Completed Studies) | Count |
| Addiction | 17 |
| Blood disorders | 4 |
| Cancer/chemotherapy side effects | 2 |
| Cardiovascular diseases | 10 |
| Dermatologic disorders | 2 |
| Gastrointestinal diseases | 15 |
| Genetic disorders | 1 |
| Infectious diseases | 3 |
| Metabolic diseases | 8 |
| Muscle disorders | 1 |
| Neuro/psychiatric disorders | 24 |
| Obstetrics | 11 |
| Ophthalmological diseases | 5 |
| ORL | 5 |
| Other | 4 |
| Poisoning antidote | 2 |
| Pulmonary diseases | 13 |
| Renal disorders | 31 |
| Surgery complications/trauma | 1 |
| Grand Total | 159 |
| Phase/Medical Conditions (Active Studies) | Count |
| Early Phase 1 | 5 |
| Addiction | 2 |
| Metabolic diseases | 1 |
| Neuro/psychiatric disorders | 1 |
| Pulmonary diseases | 1 |
| Not Applicable | 10 |
| Cardiovascular diseases | 2 |
| Gastrointestinal diseases | 1 |
| Graft/stem cell complications/trauma | 1 |
| Neuro/psychiatric disorders | 4 |
| Obstetrics | 1 |
| Surgery complications/trauma | 1 |
| Phase 1 | 4 |
| Addiction | 1 |
| Cancer/chemotherapy side effects | 1 |
| Neuro/psychiatric disorders | 1 |
| Poisoning antidote | 1 |
| Phase 1|Phase 2 | 3 |
| Cancer/chemotherapy side effects | 2 |
| Gastrointestinal diseases | 1 |
| Phase 2 | 13 |
| Addiction | 6 |
| Cancer/chemotherapy side effects | 1 |
| Gastrointestinal diseases | 1 |
| Genetic disorders | 1 |
| Graft/stem cell complications/trauma | 1 |
| Infectious diseases | 1 |
| Neuro/psychiatric disorders | 2 |
| Phase 2|Phase 3 | 3 |
| Addiction | 1 |
| Graft/stem cell complications/trauma | 1 |
| Obstetrics | 1 |
| Phase 3 | 8 |
| Cancer/chemotherapy side effects | 1 |
| Cardiovascular diseases | 3 |
| Neuro/psychiatric disorders | 2 |
| Surgery complications/trauma | 2 |
| Phase 4 | 8 |
| Addiction | 2 |
| Gastrointestinal diseases | 1 |
| Graft/stem cell complications/trauma | 1 |
| Neuro/psychiatric disorders | 2 |
| Surgery complications/trauma | 2 |
| Grand Total | 54 |
| Phase/Medical Conditions (Completed Studies) | Count |
| Early Phase 1 | 3 |
| Addiction | 1 |
| Blood disorders | 1 |
| ORL | 1 |
| Not Applicable | 18 |
| Cardiovascular diseases | 1 |
| Gastrointestinal diseases | 3 |
| Metabolic diseases | 3 |
| Neuro/psychiatric disorders | 2 |
| Obstetrics | 2 |
| Pulmonary diseases | 2 |
| Renal disorders | 5 |
| Phase 1 | 22 |
| Addiction | 3 |
| Cancer/chemotherapy side effects | 1 |
| Cardiovascular diseases | 1 |
| Gastrointestinal diseases | 2 |
| Neuro/psychiatric disorders | 4 |
| Ophthalmological diseases | 4 |
| ORL | 1 |
| Other | 4 |
| Pulmonary diseases | 1 |
| Renal disorders | 1 |
| Phase 1|Phase 2 | 12 |
| Addiction | 2 |
| Blood disorders | 1 |
| Infectious diseases | 1 |
| Metabolic diseases | 3 |
| Neuro/psychiatric disorders | 2 |
| Obstetrics | 2 |
| Renal disorders | 1 |
| Phase 2 | 47 |
| Addiction | 8 |
| Blood disorders | 1 |
| Cancer/chemotherapy side effects | 1 |
| Cardiovascular diseases | 4 |
| Dermatologic disorders | 1 |
| Gastrointestinal diseases | 2 |
| Genetic disorders | 1 |
| Infectious diseases | 1 |
| Metabolic diseases | 1 |
| Muscle disorders | 1 |
| Neuro/psychiatric disorders | 14 |
| Obstetrics | 1 |
| Ophthalmological diseases | 1 |
| ORL | 1 |
| Pulmonary diseases | 2 |
| Renal disorders | 7 |
| Phase 2|Phase 3 | 8 |
| Gastrointestinal diseases | 1 |
| Obstetrics | 1 |
| ORL | 1 |
| Renal disorders | 5 |
| Phase 3 | 20 |
| Addiction | 2 |
| Blood disorders | 1 |
| Cardiovascular diseases | 2 |
| Dermatologic disorders | 1 |
| Gastrointestinal diseases | 4 |
| Infectious diseases | 1 |
| Obstetrics | 2 |
| Pulmonary diseases | 2 |
| Renal disorders | 5 |
| Phase 4 | 29 |
| Addiction | 1 |
| Cardiovascular diseases | 2 |
| Gastrointestinal diseases | 3 |
| Metabolic diseases | 1 |
| Neuro/psychiatric disorders | 2 |
| Obstetrics | 3 |
| ORL | 1 |
| Poisoning antidote | 2 |
| Pulmonary diseases | 6 |
| Renal disorders | 7 |
| Surgery complications/trauma | 1 |
| Grand Total | 159 |
ORL: Otorhinolaryngology.