| Histamine Receptor Antagonists | Not Available | 3 | 18 | Details |
| Histamine-3 (H3) Receptor Antagonists/Inverse Agonists | Not Available | 1 | 9 | Details |
| Histamine-3 Receptor Antagonist/Inverse Agonist | Not Available | 1 | 9 | Details |
| Histidine Decarboxylase, antagonists & inhibitors | Not Available | 0 | 0 | Details |
| Histocompatibility Antigens | A group of antigens that includes both the major and minor histocompatibility antigens.... more | 2 | 3 | Details |
| Histocompatibility Antigens Class I | Not Available | 1 | 1 | Details |
| Histone deacetylase (HDAC) inhibitors | Not Available | 7 | 38 | Details |
| Histone Deacetylase Inhibitors | Compounds that inhibit HISTONE DEACETYLASES. This class of drugs may influence gene exp... more | 27 | 133 | Details |
| HIV | Not Available | 2 | 0 | Details |
| HIV 1 Post-attachment Fusion Inhibitors | Not Available | 1 | 3 | Details |
| HIV Antibodies | Not Available | 1 | 1 | Details |
| HIV Antigens | Antigens associated with specific proteins of the human adult T-cell immunodeficiency v... more | 2 | 4 | Details |
| HIV Envelope Protein gp120 | Not Available | 0 | 0 | Details |
| HIV Envelope Protein gp41 | Transmembrane envelope protein of the HUMAN IMMUNODEFICIENCY VIRUS which is encoded by ... more | 1 | 3 | Details |
| HIV Fusion Inhibitors | Inhibitors of the fusion of HIV to host cells, preventing viral entry. This includes co... more | 9 | 24 | Details |
| HIV Integrase | Not Available | 1 | 4 | Details |
| HIV Integrase Inhibitors | Inhibitors of HIV INTEGRASE, an enzyme required for integration of viral DNA into cellu... more | 5 | 31 | Details |
| HIV Protease Inhibitors | Inhibitors of HIV PROTEASE, an enzyme required for production of proteins needed for vi... more | 15 | 169 | Details |
| HIV protease inhibitors, saquinavir derivatives | Not Available | 0 | 0 | Details |
| HIV Reverse Transcriptase | Not Available | 3 | 5 | Details |
| HIV Reverse Transcriptase, antagonists & inhibitors | Not Available | 3 | 4 | Details |
| HIV Wasting Syndrome | Not Available | 0 | 0 | Details |
| HLA-B7 Antigen | Not Available | 1 | 0 | Details |
| Homosteroids | Steroids whose structure has been expanded by the addition of one or more carbon atoms ... more | 1 | 1 | Details |
| Hormonal Contraceptives for Systemic Use | Chemical substances that prevent or reduce the probability of CONCEPTION. | 52 | 442 | Details |