The AIDSinfo Drug Database provides HIV/AIDS drug fact sheets describing the drug's use, pharmacology, side effects, and other information. The database includes:

This page is designed to help you locate trials studying HIV/AIDS. This is a database, produced by the NLM (National Library of Medicine).
http://aidsinfo.nih.gov/ClinicalTrials/Default.aspx?MenuItem=ClinicalTrials

The Alzheimer's Disease Clinical Trials Database is a joint project of the U.S. Food and Drug Administration (FDA) and the National Institute on Aging (NIA) maintained by the NIA's Alzheimer's Disease Education and Referral (ADEAR) Center.
http://www.alzheimers.org/trials/index.html

Excellent and clinically relevant guide to antibiotics, produced by the John Hopkins Division of Infectious Diseases. Different versions for handhelds are available.
http://www.hopkins-abxguide.org/

Swiss pharmacopoeia.
http://www.kompendium.ch

British National Formulary is the database of drugs used in Great Britain.
http://www.bnf.org

This british database is maintained by BioMedCentral and it contains two registries:

The table contains lists of drugs in columns under the designation of specific cytochrome P450 isoforms.
http://drug-interactions.com

Database for Anti-HIV Compounds, made by the NIH, National Institutes of Health, Division of Aids.
http://www.niaid.nih.gov/daids/dtpdb/

A database for facilitating the search for drug adverse reaction target. It contains information about known drug adverse rection targets, functions and properties.
http://xin.cz3.nus.edu.sg/group/drt/dart.asp

List of drugs, causing lung diseases. Provided by the Department of Pulmonary Diseases and Intensive Care Unit. University Hospital. Dijon, France.
http://www.pneumotox.com/

The DrugBank database is a unique bioinformatics and cheminformatics resource that combines detailed drug (i.e. chemical, pharmacological and pharmaceutical) data with comprehensive drug target (i.e. sequence, structure, pathway) information.
http://www.drugbank.ca/

Detailed information about drugs, approved by the European Agency for the Evaluation of Medicinal Products.
http://www.emea.europa.eu/index/indexh1.htm

Registry of cancer trials in Germany.
http://www.studien.de/

The database is a compilation of mutations in HIV genes that confer resistance to anti-HIV drugs.
http://hivdb.stanford.edu/

Receptor Nomenclature DAtabase by the International Union of Pharmacology (IUPHAR).
http://www.iuphar-db.org/iuphar-rd/index.html

Medscape DrugInfo utilizes data from First DataBank, the American Society of Health-System Pharmacists and the FDA's Drug Alert service.
http://www.medscape.com/druginfo

Medicinal materials from natural sources have been used for centuries in China and other countries. They have been recognized as particularly suitable for treating modern diseases such as cardiovascular diseases, asthma and other long-term illnesses. Substitutes and adulterants are often introduced intentionally or accidentally, thus seriously interfering with their therapeutic effects, even leading to life-threatening poisoning. Medicinal materials are traditionally identified by their organoleptic characteristics and other physical properties. However, the differences among related species are sometimes too minute. Chemical analyses may be affected by the physiological and the storage conditions. With the advancement of molecular biology, DNA barcoding has now become a popular means for identification and authentication of plant and animal species. We have established this DNA barcode database for users to retrieve and analyze DNA sequences of medicinal materials. This website includes DNA sequences and information and key references of the medicinal materials recorded in the Pharmacopoeia of the People’s Republic of China, American Herbal Pharmacopoeia and other related references. Relevant information of common adulterants and substitutes are also listed. This database provides a web-based platform for storage, retrieval, comparison and analysis of DNA sequences, for distinguishing medicinal materials from their common substitutes and adulterants.
http://137.189.51.24/mherbsdb/

The NCCN Drugs & Biologics Compendium™ is an important source of information for case managers, managed care decision-makers, and other health care professionals who authorize treatment for patients. Based on the NCCN Clinical Practice Guidelines in Oncology™, the compendium delineates uses of drugs and biologics in the care of cancer patients, listing FDA-approved disease indications and specific NCCN recommendations for use, as well as defining levels of evidence and categories of consensus supporting recommendations.
http://www.nccn.org/professionals/default.asp

A database about investigational drugs, provided by the NCI.
http://dtp.nci.nih.gov/docs/idrugs/chemdata.html

Clinical trials by the Natioanl Cancer Instiute (NCI).
http://cancer.gov/search/clinical_trials/search_clinicaltrialsadvanced.aspx

Website, made by the Pharmaceutical Research and Manufacturers of America (PhRMA); it provides an overview about new drugs in development.
http://newmeds.phrma.org/

This excellent website, made by the Abramson Cancer Center of the University of Pennsylvania, provides a database of clinical cancer trials.
http://www.oncolink.com/treatment/trials.html

Compilation of information on orphan diseases.
http://www.orpha.net

Clinical Trials on the field of oncology.
http://www.cancer.gov/clinicaltrials/

Peptaibol (antibiotic peptide) sequences - a bioinformatics resource from the School of Crystallography, Birkbeck College, University of London.
http://www.cryst.bbk.ac.uk/peptaibol/home.shtml

PharmGKB is a publicly available Internet research tool developed by Stanford University with funding from the National Institutes of Health (NIH) and is part of the NIH Pharmacogenetics Research Network (PGRN), a nationwide collaborative research consortium. Its aim is to aid researchers in understanding how genetic variation among individuals contributes to differences in reactions to drugs. The PharmGKB database is a central repository for genetic and clinical information about people who have participated in research studies at various medical centers in the PGRN. In addition, genomic data, molecular and cellular phenotype data, and clinical phenotype data are accepted from the scientific community at large.
http://www.pharmgkb.org

PsiTri is a database on published and unpublished controlled clinical trials, reporting on treatments and interventions for a wide range of conditions within the field of mental health.
http://psitri.stakes.fi/

Database of drugs that prolong the Qt interval
http://www.qtdrugs.org

German pharmacopoeia.
http://www.rote-liste.de

Excellent basic drug information; hints on side effects and drug interactions.
http://www.rxlist.com

SuperDrug is a conformational drug database. It contains approximately 2500 3D-structures of active ingredients of essential marketed drugs.
http://bioinf.charite.de/superdrug/

The Therapeutically Relevant Multiple Pathways Database is designed to provide information about such multiple pathways and related therapeutic targets described in the literatures, the targeted disease conditions, and the corresponding drugs/ligands directed at each of these targets.
http://xin.cz3.nus.edu.sg/group/trmp/trmp.asp

A database to provide information about the known and explored therapeutic protein and nucleic acid targets, the targeted disease, pathway information and the corresponding drugs/ligands directed at each of these targets.
http://xin.cz3.nus.edu.sg/group/cjttd/ttd.asp

A significant number of Active Pharmaceutical Ingredients (APIs) have been identified in the environment and in surface waters. Data on the environmental hazards associated with these substances are emerging but are still scarce. We have compiled publicly available ecotoxicity data for APIs into a database called WikiPharma.
http://www.miphdatabase.com/