DrugBank Database

2. Drug Information Queries

Extract comprehensive drug information from the database including identifiers, chemical properties, pharmacology, clinical data, and cross-references to external databases.

Query capabilities:

• Search by DrugBank ID, name, CAS number, or keywords
• Extract basic drug information (name, type, description, indication)
• Retrieve chemical properties (SMILES, InChI, molecular formula)
• Get pharmacology data (mechanism of action, pharmacodynamics, ADME)
• Access external identifiers (PubChem, ChEMBL, UniProt, KEGG)
• Build searchable drug datasets and export to DataFrames
• Filter drugs by type (small molecule, biotech, nutraceutical)

When to use: Retrieving specific drug information, building drug databases, pharmacology research, literature review, drug profiling.

Reference: See references/drug-queries.md for XML navigation, query functions, data extraction methods, and performance optimization.

3. Drug-Drug Interactions Analysis

Analyze drug-drug interactions (DDIs) including mechanism, clinical significance, and interaction networks for pharmacovigilance and clinical decision support.

Analysis capabilities:

• Extract all interactions for specific drugs
• Build bidirectional interaction networks
• Classify interactions by severity and mechanism
• Check interactions between drug pairs
• Identify drugs with most interactions
• Analyze polypharmacy regimens for safety
• Create interaction matrices and network graphs
• Perform community detection in interaction networks
• Calculate interaction risk scores

When to use: Polypharmacy safety analysis, clinical decision support, drug interaction prediction, pharmacovigilance research, identifying contraindications.

Reference: See references/interactions.md for interaction extraction, classification methods, network analysis, and clinical applications.

4. Drug Targets and Pathways

Access detailed information about drug-protein interactions including targets, enzymes, transporters, carriers, and biological pathways.

Target analysis capabilities:

• Extract drug targets with actions (inhibitor, agonist, antagonist)
• Identify metabolic enzymes (CYP450, Phase II enzymes)
• Analyze transporters (uptake, efflux) for ADME studies
• Map drugs to biological pathways (SMPDB)
• Find drugs targeting specific proteins
• Identify drugs with shared targets for repurposing
• Analyze polypharmacology and off-target effects
• Extract Gene Ontology (GO) terms for targets
• Cross-reference with UniProt for protein data

When to use: Mechanism of action studies, drug repurposing research, target identification, pathway analysis, predicting off-target effects, understanding drug metabolism.

Reference: See references/targets-pathways.md for target extraction, pathway analysis, repurposing strategies, CYP450 profiling, and transporter analysis.

5. Chemical Properties and Similarity

Perform structure-based analysis including molecular similarity searches, property calculations, substructure searches, and ADMET predictions.

Chemical analysis capabilities:

• Extract chemical structures (SMILES, InChI, molecular formula)
• Calculate physicochemical properties (MW, logP, PSA, H-bonds)
• Apply Lipinski's Rule of Five and Veber's rules
• Calculate Tanimoto similarity between molecules
• Generate molecular fingerprints (Morgan, MACCS, topological)
• Perform substructure searches with SMARTS patterns
• Find structurally similar drugs for repurposing
• Create similarity matrices for drug clustering
• Predict oral absorption and BBB permeability
• Analyze chemical space with PCA and clustering
• Export chemical property databases

When to use: Structure-activity relationship (SAR) studies, drug similarity searches, QSAR modeling, drug-likeness assessment, ADMET prediction, chemical space exploration.

Reference: See references/chemical-analysis.md for structure extraction, similarity calculations, fingerprint generation, ADMET predictions, and chemical space analysis.

Typical Workflows

Drug Discovery Workflow

1. Use data-access.md to download and access latest DrugBank data
2. Use drug-queries.md to build searchable drug database
3. Use chemical-analysis.md to find similar compounds
4. Use targets-pathways.md to identify shared targets
5. Use interactions.md to check safety of candidate combinations

Polypharmacy Safety Analysis

1. Use drug-queries.md to look up patient medications
2. Use interactions.md to check all pairwise interactions
3. Use interactions.md to classify interaction severity
4. Use interactions.md to calculate overall risk score
5. Use targets-pathways.md to understand interaction mechanisms

Drug Repurposing Research

1. Use targets-pathways.md to find drugs with shared targets
2. Use chemical-analysis.md to find structurally similar drugs
3. Use drug-queries.md to extract indication and pharmacology data
4. Use interactions.md to assess potential combination therapies

Pharmacology Study

1. Use drug-queries.md to extract drug of interest
2. Use targets-pathways.md to identify all protein interactions
3. Use targets-pathways.md to map to biological pathways
4. Use chemical-analysis.md to predict ADMET properties
5. Use interactions.md to identify potential contraindications

Installation Requirements

Python Packages

uv pip install drugbank-downloader  # Core access
uv pip install bioversions          # Latest version detection
uv pip install lxml                 # XML parsing optimization
uv pip install pandas               # Data manipulation
uv pip install rdkit                # Chemical informatics (for similarity)
uv pip install networkx             # Network analysis (for interactions)
uv pip install scikit-learn         # ML/clustering (for chemical space)

Account Setup

1. Create free account at go.drugbank.com
2. Accept license agreement (free for academic use)
3. Obtain username and password credentials
4. Configure credentials as documented in references/data-access.md

Data Version and Reproducibility

Always specify the DrugBank version for reproducible research:

from drugbank_downloader import download_drugbank
path = download_drugbank(version='5.1.10')  # Specify exact version

Document the version used in publications and analysis scripts.

Best Practices

1. Credentials: Use environment variables or config files, never hardcode
2. Versioning: Specify exact database version for reproducibility
3. Caching: Cache parsed data to avoid re-downloading and re-parsing
4. Namespaces: Handle XML namespaces properly when parsing
5. Validation: Validate chemical structures with RDKit before use
6. Cross-referencing: Use external identifiers (UniProt, PubChem) for integration
7. Clinical Context: Always consider clinical context when interpreting interaction data
8. License Compliance: Ensure proper licensing for your use case

Reference Documentation

All detailed implementation guidance is organized in modular reference files:

• references/data-access.md: Authentication, download, parsing, API access, caching
• references/drug-queries.md: XML navigation, query methods, data extraction, indexing
• references/interactions.md: DDI extraction, classification, network analysis, safety scoring
• references/targets-pathways.md: Target/enzyme/transporter extraction, pathway mapping, repurposing
• references/chemical-analysis.md: Structure extraction, similarity, fingerprints, ADMET prediction

Load these references as needed based on your specific analysis requirements.