ADMET Absorption distribution Absorption, distribution, metabolism, excretion, and toxicity Adaptive boosting Binding affinities Binding energy Clifford algebra Clifford–Fourier transform Decision trees Drug repurposing DrugBank Drugbank Fourier transform Fuzzy Delphi method Learner perception Learning at scale Learning design strategy framework Machine learning Machine-learning Moodle Natural language processing systems Online learning environment Opioid receptors Opioid use disorder Opioids Repurposing Transforming e-learning article biomedicine case report