Explanation of terms used by DrugBank

Small Molecule Drug

Small Molecule, Small molecule drug

Low molecular weight drugs (900 daltons) which are produced by chemical synthesis. These drugs have well defined structures and chemical properties. In DrugBank, some drugs larger than 900 daltons are considered small molecule drugs (such as monomers: ribo- or deoxyribonucleotides, amino acids, and monosaccharides).

In DrugBank, drugs are organized at the highest level into Small Molecule Drugs and [Biotech Drugs].